Windows Network Load Balancing not working

OS: Windows Server 2008 R2
Tested in our environment both are able to talk to each other. One will be converged as DEFAULT and another will be just converged.
When deployed at Customer site, Server1 is converged as Default as seen in Server1.
Server 2 is converged as Default as seen in Server 2.
Server1 and 2 are in the same subnet and have no firewalls in between. (They seem unable to detect each other)
NLB Configurations is using multicast.
Would like to know how to resolve this issue.

Hi,
First, please try to ping each other with FQDN on the servers.
Also, please make sure that the servers are connected to a layer2 switch or hub.
To verify if this issue is caused by the misconfigure of the network device, pleae try to connect these servers to a hub for the test.
Besides, is there any warning or error related to this issue in the event viewer of these servers?
Here is a troubshooting guide for NLB, it may be helpful,
http://technet.microsoft.com/en-us/library/cc732592.aspx#BKMK_N
Best Regards.
Steven Lee
TechNet Community Support

Similar Messages

Network Load Balancing not working with UDP traffic (Server 2012)

Hi all,
I manage an application that receives traffic from mobile devices on cellular networks. The traffic is UDP. I have set up two x Server 2012 VMs to form part of a NLB cluster. Each server has a second NIC dedicated to NLB. The traffic is simply NATed from
our firewalls to the virtual IP. When looking at the traffic using a packet sniffer, I can see the traffic being routed correctly to the virtual IP, but the problem is that the return traffic is sent from the IP address on the actual NIC. My application does
not like the fact that the return traffic is coming from a different source IP. Is there any way to force the return traffic to also come from the virtual IP address?
Thanks!

Hi
NLB return traffic for UDP would come from the node IPs.
You could use NAT on your firewalls so they come from the same public IP.
Otherwise you'd be looking at something other than MS NLB.
Cheers
GF

Windows Server 2012 R2 - ADFS/Windows Network Load Balancing Converging Issue

Hello,
My name is Brandon. We have started upgrading our servers to Windows Server 2012 R2. We have some powerful servers for running ESXI 5.5 as the OS with the Guest Operating Systems as Windows Server 2012 R2. As far of our migrations/upgrades we have configured
ADFS 2012 R2 into a Server Farm with Windows Network Load Balancing to add redundancy in the event a server goes down.
I have been having issues with a Node with the Cluster getting stuck in the Status of Converging. The only way I have been able to get it back up is to restart the virtual server completely and it is temporary. When I first configure the Cluster the two
virtual servers get added to the Node with no problems and fully converge. However, after some time a node will end up in Converging and this takes Authentication for ADFS down as the nodes can not be contacted over Port 443.
Error: Host: server.domain.com Unable to connect to "server name"
System
Provider
[ Name]
Microsoft-Windows-NLB
[ Guid]
{F22AF71F-C4C3-425D-9653-B2F47B85DD30}
EventID
21
I have tried using 1 & 2 Virtual NICs on the machines and still end up with communication issues. Could someone assist me with why I am having this issue? This is not an issue with a firewall. If it was a firewall it would never communicate the first
time. Has anyone had experience with a similar configuration and how were you able to make it work?
Below is my configuration.
Static ARP Entry for Cluster IP Address has been added to our Layer 3 switch.
Physical Server 1:
ESXI 5.5 HOST
1 NIC CONNECTED (shared with virtual guest)
IP ADDRESS: 192.168.0.5
SUBNET: 255.255.255.0
DGW: 192.168.0.1
Virtual Server 1 (Guest OS)
Physical Server 2:
ESXI 5.5 HOST
1 NIC CONNECTED (shared with virtual guest)
IP ADDRESS: 192.168.0.6
SUBNET: 255.255.255.0
DGW: 192.168.0.1
Virtual Server 2 (Guest OS)
Virtual Servers
Virtual Server 1
MS SERVER 2012 R2 (VIRTUAL)
NLB NODE 2
VIRTUAL NETWORK ADAPTERS
VNIC1 IP ADDRESS 192.168.0.10
SUBNET: 255.255.255.0
DGW: 192.168.0.1
VNIC 2 (NLB)
IP ADDRESS: 192.168.0.11
SUBNET: 255.255.255.0
Virtual Server 2
MS SERVER 2012 R2 (VIRTUAL)
NLB NODE 2
VIRTUAL NETWORK ADAPTERS
VNIC1
IP ADDRESS 192.168.0.20
SUBNET: 255.255.255.0
DGW: 192.168.0.1
VNIC 2 (NLB)
IP ADDRESS: 192.168.0.21
SUBNET: 255.255.255.0
Cluster Configuration/Properties
CLUSTER PROPERTIES CLUSTER IP: 192.168.0.30
CLUSTER SUBNET: 255.255.255.0
FULL INTERNET NAME: FS.DOMAIN.COM
CLUSTER OPERATION MODE: MULTICAST
PORT RULES:
CLUSTER IP ADDRESS
START
END
PROTOCAL
MODE
PRIORITY
LOAD
AFFINITY
ALL
80
80
BOTH
MULTIPLE
EQUAL
NONE
ALL
443
443
BOTH
MULTIPLE
EQUAL
NONE
CLUSTER NODES:
1.) SERVER1.DOMAIN.COM
a. IP: 192.168.0.11
2.) SERVER2.DOMAIN.COM
a. IP: 192.168.0.21

Hi,
According to your description, my understanding is that：2 ESXI 5.5 physical devices (192.168.0.5 and 192.168.0.6), each of them has a virtual WS 2012 R2(192.168.0.10 and 192.168.0.20). Cluster the 2 virtual servers successfully, but they corrupt with event
ID 21, and a restart of virtual device will resolve this problem temporarily.
Event ID 21 means that NLB failed to converge due to inconsistencies in the port rules between this host and cluster host. This will occur if the number of port rules or the type of port rules are different between hosts.
Ensure that all NLB hosts have identical port rules. Detailed steps you may reference:
Event ID 21 — NLB Port Rules Configuration
https://technet.microsoft.com/en-us/library/dd364034%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396
Best Regards,
Eve Wang
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

Windows Server 2012 R2 - Windows Network Load Balancing Converging Issue

Hello,
My name is Brandon. We have started upgrading our servers to Windows Server 2012 R2. We have some powerful servers for running ESXI 5.5 as the OS with the Guest Operating Systems as Windows Server 2012 R2. As far of our migrations/upgrades we have configured
ADFS 2012 R2 into a Server Farm with Windows Network Load Balancing to add redundancy in the event a server goes down.
I have been having issues with a Node with the Cluster getting stuck in the Status of Converging. The only way I have been able to get it back up is to restart the virtual server completely and it is temporary. When I first configure the Cluster the two
virtual servers get added to the Node with no problems and fully converge. However, after some time a node will end up in Converging and this takes Authentication for ADFS down as the nodes can not be contacted over Port 443.
Error: Host: server.domain.com Unable to connect to "server name"
System
Provider
Name]
Microsoft-Windows-NLB
Guid]
{F22AF71F-C4C3-425D-9653-B2F47B85DD30}
EventID
21
I have tried using 1 & 2 Virtual NICs on the machines and still receive this error even if only 1 VNIC is assigned to the virtual machine. Could someone assist me with why I am having this issue? Has anyone had experience with a similar configuration
and how were you able to make it work?
Below is my configuration.
Static ARP Entry for Cluster IP Address has been added to our Layer 3 switch.
Physical Server 1:
ESXI 5.5 HOST
1 NIC CONNECTED (shared with virtual guest)
IP ADDRESS: 192.168.0.5
SUBNET: 255.255.255.0
DGW: 192.168.0.1
Virtual Server 1
Physical Server 2:
ESXI 5.5 HOST
1 NIC CONNECTED (shared with virtual guest)
IP ADDRESS: 192.168.0.6
SUBNET: 255.255.255.0
DGW: 192.168.0.1
Virtual Server 2
Virtual Servers
Virtual Server 1
MS SERVER 2012 R2 (VIRTUAL)
NLB NODE
2 – VIRTUAL NETWORK ADAPTERS
VNIC1
IP ADDRESS 192.168.0.10
SUBNET: 255.255.255.0
DGW: 192.168.0.1
VNIC 2 (NLB)
IP ADDRESS: 192.168.0.11
SUBNET: 255.255.255.0
Virtual Server 2
MS SERVER 2012 R2 (VIRTUAL)
NLB NODE
2 – VIRTUAL NETWORK ADAPTERS
VNIC1
IP ADDRESS 192.168.0.20
SUBNET: 255.255.255.0
DGW: 192.168.0.1
VNIC 2 (NLB)
IP ADDRESS: 192.168.0.21
SUBNET: 255.255.255.0
Cluster Configuration/Properties
CLUSTER PROPERTIES
CLUSTER IP: 192.168.0.30
CLUSTER SUBNET: 255.255.255.0
FULL INTERNET NAME: FS.DOMAIN.COM
CLUSTER OPERATION MODE: MULTICAST
PORT RULES:
CLUSTER IP ADDRESS  START END PROTOCAL MODE   PRIORITY LOAD  AFFINITY
ALL    80 80 BOTH  MULTIPLE  ..  EQUAL  NONE
ALL    443 443 BOTH  MULTIPLE  ..  EQUAL  NONE
CLUSTER NODES:
1.) SERVER1.DOMAIN.COM
a. IP: 192.168.0.11
2.) SERVER2.DOMAIN.COM
a. IP: 192.168.0.21

Thank you for your response. It took me a while to figure it out, but the whole issue was related to the type of Virtual Network Adapter I was selecting.
I changed the network adapter from E1000 to VMXNET 3 and have not had a single error in the event logs or Windows NLB.
I read somewhere that VMXNET 3 is preferred for Windows Server 2012 R2.
https://communities.vmware.com/thread/433792
Leyuka       May 23, 2013 6:14 AM
"Just a help for everyone with this problem :
After 10 days of research for our virtual datacenter behind a vcloud as iias , i found a solution .
I only run windows 2012 server .
Install vmware tools , remove e1000 network card after a vm stop, add a card same vswitch etc BUT with a vmxnet3 TYPE . DONT USE DEFAULT CARD
Start and enjoy this solution . E1000 and E1000e are just unstable in windows8 / windows 2012 , the network card reset randomly with or without heavy IO. No log in windows , and as a vcloud user i don"t have esxi logs (damn i don't like cloud) and provider
don"t know why ..."

Windows Network Load Balancing - Virtual MAC Address

Hi All,
I have environment that running 2 Exchange 2010 server with CASHT and join windows network load balancing as a node.
My question is,
If NLB service is restart, is it virtual MAC Address for NLB will change to new virtual MAC Address?
Thanks for response,
Best Regards,
Henry Stefanus

Hi Henry Stefanus,
The NLB work mechanism will not change whether what higher application we used and I am not very familiar with Exchange NLB architecture, may the following KB and article
may help you.
When you use the unicast method, all cluster hosts share an identical unicast MAC address. Network Load Balancing overwrites the original MAC address of the cluster adapter
with the unicast MAC address that is assigned to all the cluster hosts.
When you use the multicast method, each cluster host retains the original MAC address of the adapter. In addition to the original MAC address of the adapter, the adapter is
assigned a multicast MAC address, which is shared by all cluster hosts. The incoming client requests are sent to all cluster hosts by using the multicast MAC address.
Selecting the Unicast or Multicast Method of Distributing Incoming Requests
http://technet.microsoft.com/en-us/library/cc782694(v=ws.10).aspx
The related third party article:
Building NLB Exchange 2010 RTM CAS / HT Servers (Hyper-V) – Part 1
http://blog.morecoffeeany1.com/2010/03/19/building-nlb-exchange-2010-rtm-cas-ht-servers-hyper-v-%E2%80%93-part-1/
I’m glad to be of help to you!
*** This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these
sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use
of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet. ***
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Host Unreachable intermittently within a Windows Network Load Balancing Cluster

Hi,
We have 2 Windows 2008 R2 servers running multiple IIS web sites and load balanced across Windows Network Load Balancer in unicast mode. Although there are two interfaces in each server, only 1 interface in each server participates in load balancing and
other interface is used for a different backup LAN. The problem I am going to mention was not seen within the NLB for almost 1 year.
I have noticed intermittent "host unreachable" detected from NLB in each host from time to time since 3 weeks ago. After servers are rebooted, both hosts can be reached and can be detected from NLB manager. However it becomes unreachable in both
servers within minutes and then becomes reachable again after several minutes. This behavior is noticed in the load balancer and pings do not work between the two hosts when the issue occurs. I did a packet capture to see what was going on with ARP message
when the issue occurs. ARP entry goes missing in each server when the problem occurs and no ARP replies are returned from each server. But ARP requests are dispatched from both servers when the issue occurs. ARP replies come back after sometime after which
hosts become reachable again.
I tried to create a permanent static ARP entry (By copying the MAC address from ARP table when the two hosts are reachable) in each host but that hasn't solved the issue either. It seems like the individual MAC address generated by each host is a virtual
one and it doesn't seem to respond when the problem occurs.
However load balancing and web sites are fully functional without any issues even while "host unreachability" issue is detected.
Appreciate if someone could help me to dig the real problem out.
Thank you.

Hi,
Did you do some change of your network or the NLB firewall settings recently?
If you are using the NLB cluster in Hyper-V guest vm you need to enable the spoofing of MAC address.
The related article:
Cannot access the virtual or dedicated IP address of an NLB node (Guest) running in Unicast Mode on Windows Server 2008 R2 Hyper-V
http://blogs.technet.com/b/networking/archive/2010/02/12/cannot-access-the-virtual-or-dedicated-ip-address-of-an-nlb-node-guest-running-in-unicast-mode-on-windows-server-2008-r2-hyper-v.aspx
More information:
Selecting the Unicast or Multicast Method of Distributing Incoming Requests
http://technet.microsoft.com/en-us/library/cc782694(v=ws.10).aspx
Single network adapter
http://technet.microsoft.com/en-us/library/cc776178(v=ws.10).aspx
Hope this helps.
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

RV042 Load Balancing not working correctly?

We have an RV042 on firmware version 1.3.13.02 and 2 ISPs:
WAN1 = Telepacific T1
1.5Mbps down and 1.5Mbps up
WAN2 = AT&T U-Verse
12Mbps down and 5Mbps up
I have it set to Load Balance, Primary WAN = WAN2
Network Service Detection enabled, only pinging the Remote Host of 4.2.2.2 and set to Generate Log
Bandwidth is set to:
WAN1 = 1000Kbps upstream & downstream
WAN2 = 5040Kbps upstream & 12000Kbps downstream
It seems to pick WAN1 a lot of the time. Do I have something setup wrong?

Ok, so what do you recommend? To setup binding for ports important to direct over say… WAN1 (my fast access) shall I also keep the bandwidth management set up as is, example:
For me it’s confusing because this config appears to be clear to me that has to control traffic the way I want .
Thanks for your response.
H Aragon
De: jasbryan
Enviado el: lunes, 20 de febrero de 2012 03:18 p.m.
Para: HECTOR MANUEL ARAGON
Asunto: - Re: RV042 Load Balancing not working correctly?
Home
Re: RV042 Load Balancing not working correctly?
created by jasbryan in Small Business Routers - View the full discussion

Network Load Balancing not failing over properly

I have 2 MS 2012 servers setup in a NLB unicast configuration, with 2 NICs each on the same subnet. When I take down the second server (and only the second server) the FQDN goes offline. Below are the ipconfigs for each server. Any help
would be greatly appreciated!
Ethernet adapter Data NIC 192.168.220.172:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Intel(R) I350 Gigabit Network
#4
   Physical Address. . . . . . . . . : 6C-3B-E5-B2-48-60
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.220.172(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.220.1
   DNS Servers . . . . . . . . . . . : 192.168.220.100
                                       192.168.200.10
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Cluster NIC:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Broadcom BCM57810 NetXtreme II
DIS VBD Client) #67
   Physical Address. . . . . . . . . : 02-BF-C0-A8-DC-AA
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.220.171(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IPv4 Address. . . . . . . . . . . : 192.168.220.170(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.220.1
   DNS Servers . . . . . . . . . . . : 192.168.220.100
                                       192.168.200.10
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Data NIC 192.168.220.174:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : HP FlexFabric 10Gb 2-port 533FLR-
r #54
   Physical Address. . . . . . . . . : A0-D3-C1-F6-96-08
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.220.174(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.220.1
   DNS Servers . . . . . . . . . . . : 192.168.220.100
                                       192.168.200.10
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Cluster NIC:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : HP NC523SFP 10Gb 2-port Server Ad
   Physical Address. . . . . . . . . : 02-BF-C0-A8-DC-AA
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.220.173(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IPv4 Address. . . . . . . . . . . : 192.168.220.170(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.220.1
   DNS Servers . . . . . . . . . . . : 192.168.220.100
                                       192.168.200.10
   NetBIOS over Tcpip. . . . . . . . : Enabled

Hi MS DEF,
A second network adapter is required to provide peer-to-peer communication between cluster hosts. Please isolate your heartbeat network. With unicast when cluster is connected
to a switch, incoming packets are sent to all the ports on the switch, which can cause switch flooding, please confirm you have setup your switch correct, you can refer the following Cisco Switch related unicast configuration.
The Cisco switch unicast related information:
How to configure Microsoft Network Load Balancing on two switches
https://supportforums.cisco.com/discussion/11918276/how-configure-microsoft-network-load-balancing-two-switches
More information:
Selecting the Unicast or Multicast Method of Distributing Incoming Requests
http://technet.microsoft.com/en-us/library/cc782694(v=ws.10).aspx
An Optimal Network Load Balancing (NLB) Configuration
http://blogs.technet.com/b/clint_huffman/archive/2007/10/08/an-optimal-network-load-balancing-nlb-configuration.aspx
Selecting the Unicast or Multicast Method of Distributing Incoming Requests
http://technet.microsoft.com/en-us/library/cc782694(v=ws.10).aspx
I’m glad to be of help to you!
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Windows Network Shares do not work properly

Ever since installing LEOPARD (now running 10.5.2) my network shares on our Windows server are not working properly. I can connect in the office via cifs:// and the share appears. I cannot copy a file to the share. I get the following message:
"The operation cannot be completed because you do not have sufficient privileges for some of the items."
There is an icon with a size of 0kb on the share, and if I try to open it or trash it, I get a message telling me it is in use by the MAC OS. I can open a file from the share, but if I try to save it back to the share or save from an application I get a "There has been a network file permission error."
If I try to copy the file to my desktop. I get a message that tells me that I don't have permission.
If I try to connect using https:// I get a username or password not valid message. Both of the connection methods worked BEFORE I installed LEOPARD. The install was a clean install, not an upgrade. I NEED to be able to access the shares for my work. The shares are on a server running Windows Server 2003 Service Pack 2.
How can I solve this? I actually have administrator privileges on the server with my login credentials, but this does not seem to matter.

Experiencing the same exact problems here. Brand new Mac Pro on a Windows 2003 Server network. Somehow I don't think it is any rights problems in my case, as I can create and erase folders (created by me or others), and the Mac writes the .DS_Store files to the server...
However, if I try to copy a single file or a folder containing files to the server, I get only a 0k file (inside the folder if I copy a folder) and after a while an error message saying the same things William Colvin2 mentions above (not sufficient privileges).
Everything I have read seems to indicate that there is huge problems with Leopard with regard to this, and if that is true, they need to be fixed ASAP. I think I've tried and tested all the possible "solutions" (disabling SMB digital signature, GPO policies, disabling IPv6...) but still no solution in sight.
Can we get some info from Apple on this whether it's being worked on, or what we can do to SOLVE this problem? As far as I know, Windows 2003 Server hasn't changed in that respect recently, whereas OSX has gone from 10.4 Tiger to 10.5 Leopard...
Any help with solving the problem is greatly appreciated, so feel free to respond with anything that might be helpful. I would also be interested in hearing from people who have HAD this problem, but has gotten them solved. And if so, what solved it for you.
Thanks in advance.

Load balance not work,still sending new connects to node at100% CPU usage

Trying to verify that Oracle RAC load balancing ( using Load Balance Advisor and services) is working before I recommend changes to a production RAC DB.
Even though I bury (100%CPU usage) one of 2 nodes ,new connections(using a new service I created and set GOAL=SERVICE_TIME and CLB_GOAL = SHORT ) still connecting there.( connection split stays at 50/50) . Any ideas why ?
nodes are HP Itanium ( hpux 11.23) , database version is 10.2.0.5
There are 2 RAC databases on this cluster (one TEST and one Model Office)
srvctl config service -d gdrm -s BATCHQ_GDRM_SERVICEBATCHQ_GDRM_SERVICE PREF: gdrm1 gdrm2 AVAIL:

Hi Dan,
you will have to point all your systems to the Web Dispatcher in the SLD. If you don't do this, the browser will always retrieve the URL to the central instance, bypassing the Web Dispatcher. After you configured as the system to contact the Web Dispatcher, the browser will receive the URL of the Web Dispatcher and send the request to the Web Dispatcher.
On the Web Dispatcher, you'll have to configure an appropriate rule to handle that request. You can use 1 IP and different ports. Each port means another system. Or several virtual IPs and the same/different port.
IP1:8001 -> WD -> BI 1
IP1:8002 -> WD -> BI 2
or
IP1:8001 -> WD -> BI1
IP2:8002 -> WD -> BI2
In this case, you can keep the flexibility of using several backend systems with different names/IPs/Ports and one Web Dispatcher.
For refence, you can consult the following 2 documents:
General Information about how to use Web Dispatcher:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/8105db90-0201-0010-cfbe-ae94d43e2e48
How to implement Web Dispatcher as a single point of entrance
p. 40-42: "
Internet Connectivity to SAP Applications.pdf"
(Unfortunatly, I'm right now not able to locate this document again in SDN, but it exists somewhere. Good luck!)
br,
Tobias

VPN load balancing not working correctly

I have two vpn3030s configured for load balancing. They appear to recognize one another as the correct vpn(priority 10) appears to be the master. The slave however keeps getting an error message i the log "LBSSF master peer[205.172.49.252] is not answering HELLO".
He appears to timeout the master and switch himself to master where he immediately sees the master and goes back to slave. I am not sure the address above is correct for the error message, 205.172.49.252 is the virtual IP shared by both concentrators. I would expect to see hellos sent and received between the two physical interfaces. Any ideas? I am getting a buffer error on the master as well so all this may be memory related. Not sure at this point.
Johnny

it may be due to IP conflict.
also check this bug-id:CSCds70213.
Try these links for more info:
http://www.cisco.com/warp/public/471/vpn3k-conn.html
http://www.cisco.com/warp/public/471/ld_bl_vpn3000_7602.html

Sticky load balancing not working because of Address Translation

          This came up before - see below. I don't understand what the
          soltion is/was.
          WL Server puts it's ip address in the WebLogicSession cookie
          which is an internal address 192.168.201.41
          WL proxy knows WL Server only by an external address like 139.141.38.21. Since
          it does not know of any WLS with an IP
          address of 192.168.201.41, it round-robins the request instead
          of sending it to the primary WLS.
          Any help is much appreciated.
          Mike Reiche
          Robert Patrick <[email protected]> wrote:
          >Hi,
          >
          >A very typical configuration is to put the web server in the DMZ (i.e.,
          >between
          >an outer and inner firewall) and proxy the requests from the web server
          >to the
          >WebLogic server (which sits behind the inner firewall). Since all of
          >these
          >proxied requests use HTTP and a single port, the only port that needs
          >to be
          >opened in the inner firewall is an HTTP port (the outer firewall will
          >only need
          >an HTTP and/or HTTPS port opened).
          >
          >Hope this helps,
          >Robert
          >
          >Eytan Ben-Meir wrote:
          >
          >> Thanks Patrick,
          >>
          >> May be you can suggest options for securing a WLS behind a firewall?
          >>
          >> Thanks again,
          >>
          >> Eytan
          >>
          >> Robert Patrick wrote:
          >>
          >> > Hi,
          >> >
          >> > The problem is that we encode location information (e.g., IP address(es))
          >> > in the session id. If the plugin sees a session id, it decodes the
          >> > session id to find out where to route the request (i.e., which server
          >in
          >> > the cluster contains the HttpSession object for that session). Since
          >the
          >> > plugin cannot find the machine whose IP address is encoded in the
          >session
          >> > id (because of the network address translation), this will not work.
          > In
          >> > general, distributed application software needs to be modified to
          >be
          >> > capable of handling network address translation -- to my knowledge,
          >> > WebLogic Server has not been modified to support this feature (though
          >the
          >> > Enterprise version of the product has had this support for years).
          >> >
          >> > Hope this helps,
          >> > Robert
          >> >
          >> > Eytan Ben-Meir wrote:
          >> >
          >> > > Hi,
          >> > >
          >> > > Configuration:
          >> > > WLS 4.5.1 on Solaris 2.7 inside a firewall.
          >> > > SonicWall firewall with NAT (Network Address Translation).
          >> > > Netscape Enterprise Server 4.0 outside the firewall with Weblogic
          >> > > NSAPI-BRIDGE (sp 5)
          >> > >
          >> > > The problem:
          >> > > When a browser request is sent to the NE web-erver (directed to
          >the
          >> > > firewall who then redirects to a Weblogic servlet).
          >> > > IF The servlet creates a httpsession (with or without cookies)
          >the
          >> > > request fails (the firewall blocks a request directed directly
          >at the
          >> > > non-routable ip address of the Weblogic machine inside the firewall.
          >> > > IF on the other hand the servlet does not create a http session,
          >all
          >> > > works fine.??????????
          >> > > Does any body know something about this????
          >> > >
          >> > > Thanks,
          >> > >
          >> > > Eytan
          >


          This isn't my problem.
          "Mike Reiche" <[email protected]> wrote:
          >
          >This came up before - see below. I don't understand what the
          >soltion is/was.
          >
          >WL Server puts it's ip address in the WebLogicSession cookie
          > which is an internal address 192.168.201.41
          >
          >WL proxy knows WL Server only by an external address like 139.141.38.21.
          > Since
          >it does not know of any WLS with an IP
          >address of 192.168.201.41, it round-robins the request instead
          >of sending it to the primary WLS.
          >
          >Any help is much appreciated.
          >
          >Mike Reiche
          >
          >Robert Patrick <[email protected]> wrote:
          >>Hi,
          >>
          >>A very typical configuration is to put the web server in the DMZ (i.e.,
          >>between
          >>an outer and inner firewall) and proxy the requests from the web server
          >>to the
          >>WebLogic server (which sits behind the inner firewall). Since all of
          >>these
          >>proxied requests use HTTP and a single port, the only port that needs
          >>to be
          >>opened in the inner firewall is an HTTP port (the outer firewall will
          >>only need
          >>an HTTP and/or HTTPS port opened).
          >>
          >>Hope this helps,
          >>Robert
          >>
          >>Eytan Ben-Meir wrote:
          >>
          >>> Thanks Patrick,
          >>>
          >>> May be you can suggest options for securing a WLS behind a firewall?
          >>>
          >>> Thanks again,
          >>>
          >>> Eytan
          >>>
          >>> Robert Patrick wrote:
          >>>
          >>> > Hi,
          >>> >
          >>> > The problem is that we encode location information (e.g., IP address(es))
          >>> > in the session id. If the plugin sees a session id, it decodes
          >the
          >>> > session id to find out where to route the request (i.e., which server
          >>in
          >>> > the cluster contains the HttpSession object for that session).
          >Since
          >>the
          >>> > plugin cannot find the machine whose IP address is encoded in the
          >>session
          >>> > id (because of the network address translation), this will not work.
          >> In
          >>> > general, distributed application software needs to be modified to
          >>be
          >>> > capable of handling network address translation -- to my knowledge,
          >>> > WebLogic Server has not been modified to support this feature (though
          >>the
          >>> > Enterprise version of the product has had this support for years).
          >>> >
          >>> > Hope this helps,
          >>> > Robert
          >>> >
          >>> > Eytan Ben-Meir wrote:
          >>> >
          >>> > > Hi,
          >>> > >
          >>> > > Configuration:
          >>> > > WLS 4.5.1 on Solaris 2.7 inside a firewall.
          >>> > > SonicWall firewall with NAT (Network Address Translation).
          >>> > > Netscape Enterprise Server 4.0 outside the firewall with Weblogic
          >>> > > NSAPI-BRIDGE (sp 5)
          >>> > >
          >>> > > The problem:
          >>> > > When a browser request is sent to the NE web-erver (directed to
          >>the
          >>> > > firewall who then redirects to a Weblogic servlet).
          >>> > > IF The servlet creates a httpsession (with or without cookies)
          >>the
          >>> > > request fails (the firewall blocks a request directed directly
          >>at the
          >>> > > non-routable ip address of the Weblogic machine inside the firewall.
          >>> > > IF on the other hand the servlet does not create a http session,
          >>all
          >>> > > works fine.??????????
          >>> > > Does any body know something about this????
          >>> > >
          >>> > > Thanks,
          >>> > >
          >>> > > Eytan
          >>
          >

Session replication in oc4j load balancing not working ..

Hi All,
I have windows 2000 machine. I have installed 2 instances of oc4j running on ports 8888 and 8889. I started the loadbalancer.jar in the first instance, started the first oc4j instance and then started the second oc4j instance. I have a common application deployed on both instance1 and instance2 and that is nothing but out famous SessionServlet.
If I access this servlet using http://localhost:80/app/servlet/SessionServlet then I am getting a count as 1 . My loadbalancer that is started from first oc4j instance(running on port 8888) is showing that the request is routed to the first instance. I stopped my first instance1 and then again from the same browser/session/client if I access the same servlet using http://localhost:80/app/servlet/SessionServlet then still I am seeing the count as 1 instead of 2 . At this point my loadbalancer is showing that the request is routed to the second oc4j instance(running on port 8889) since first instance is stopped. So why am I seeing the count as 1 instead as 2.
Also,
1. Is it enough that we start the loadbalancer.jar in the first oc4j instance. What about the loadbalancer.jar in the second oc4j instance ?
2. We all know that Apache HTTP Server runs on port 80. But since I didnt[i]Long postings are being truncated to ~1 kB at this time.

thank you debu, I have one doubt . In the clustering/load-balancing documentation at metalink(doc id: 151717.1) it is said that in point 4b that we should add the tag <cluster-config /> to orion-web.xml file but this file will be created only after the web application is deployed and it is accessed atlest for one time. So is it that we should first deploy the web application and then access it for atlest one time then stop the server and add this tag .. or is there any other way workaround ?

Load balance not working right with jdbc connection string?

For months we've used the following connection string to get Tomcat to open connections to our Oracle 10g RAC:
jdbc:oracle:thin:@(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST
= db1vip) (PORT = 1521)) (ADDRESS = (PROTOCOL = TCP) (HOST = db2vip)
(PORT = 1521)) (LOAD_BALANCE = yes) (CONNECT_DATA = (SERVER = DEDICATED)
(SERVICE_NAME = orcl) (PREFER_LEAST_LOADED_NODE_ORCL = OFF) ) )
Today, db2 became inaccessible during prime time, and the web app completely hung--when you tried to type in a username and password to log into the site, it would just hang indefinitely, and the Tomcat log files were complaining about being unable to open a connection to the database because of a network adapter error.
I would have expected the JDBC driver Tomcat was using to just switch to the other database server, but none of our Tomcat machines did that, and I'm wondering why (they all just hung trying to connect to db2). Our guess is that the difference this time is not that Oracle was down on db2, but that db2 was down entirely. Maybe that connection string works only if the server is up when the database is down, and not when the server is unreachable (we couldn't SSH to the box, and when we tried to get to it locally using a remote access card, a lot of options were grayed out and we couldn't see a shell, so all we could do was reset the box).

Hi,
Please refer to the link below:
SCOM 2012 – Monitoring Oracle Database OLE DB Management Pack Template
http://stefanroth.net/2012/12/05/scom-2012-monitoring-oracle-database-ole-db-management-pack-template/
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Windows Network Load Balancing (WNLB) in Azure VM

Is WLNB supported in Azure VM? If you have to use DHCP, how would you assign an IP (VIP) through the WNLB manager?

Apology.
Here is my take.
1) I am assuming you will be running Azure VM in this case since you are bound to use Windows NLB. Then probably you want to set up Virtual Network. - This will ensure that the IP addresses that is assigned to each VM doesn't change.
2) It really depends on what is your usage is for to use Windows NLB, but the price compared to using Traffic Manager in Azure is way lower than running a VM that is hosting Windows NLB.
Just my 2 cents and I would love to hear your feedback.
Cheers.
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Milton Goh
MCSE, MCSA, MCITP, MOF, ITIL, AIIM SharePoint Specialist
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