ISP Failed, Internet Connection Intermittent
For a long time, my internet connection has gone through phases in which pages, images, videos, etc. stop loading something like every 1-2 minutes. I have seen gifs start loading incredibly quickly, in real time almost, then stop dead. Refreshing in this case yields an endless period of loading. I am fairly certain that this problem extends to all devices on my wireless network, but I rarely use two computers simultaneously, so I'm not certain of this. The problem is usually present for a few weeks at a time, then is stops happening for a month or two, if I remember correctly.
Whenever pages fail to load, I have found that, by opening Network Diagnostics (System Preferences>Network>Assist me…>Diagnostics…), I can temporarily restore internet connectivity. The Network Diagnostics window usually has orange lights for ISP, Internet, and Server when I first open it, though ISP's light is sometimes red. As I proceed through the program, the lights usually change after I select my network from the list. Network Settings will sometimes turn red, at which time all the lights below it will turn red as well. Whether or not this happens, though, the lights end up as green, and I am told that my internet connection seems to be working correctly. Most of the time, my internet connection will then work for some time (the length of which may vary). I have pored over all of Apple's network troubleshooting articles, none of which have resolved my issue. I have restarted my router and modem in the past, though not recently. I do not believe that the problem lies in either my iMac or wireless router (Time Capsule, 2 terabytes, 4th generation or earlier), as my modem (or possibly cable splitter) seems the liklier culprit, but my landline phone service and cable television service has not seen any service disruptions (all 3 services operate over the same cable, and are provided by the same company).
During a recent interruption of service, I used the ping command in Terminal to try to connect to the 8.8.8.8 server. The full text of the command and its output is as follows:
Rays-iMac-8:~ lorenzocastoldi$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
Request timeout for icmp_seq 0
ping: sendto: No route to host
Request timeout for icmp_seq 1
ping: sendto: No route to host
Request timeout for icmp_seq 2
ping: sendto: No route to host
Request timeout for icmp_seq 3
ping: sendto: No route to host
Request timeout for icmp_seq 4
ping: sendto: No route to host
Request timeout for icmp_seq 5
ping: sendto: No route to host
Request timeout for icmp_seq 6
ping: sendto: No route to host
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
Request timeout for icmp_seq 9
Request timeout for icmp_seq 10
Request timeout for icmp_seq 11
Request timeout for icmp_seq 12
Request timeout for icmp_seq 13
Request timeout for icmp_seq 14
Request timeout for icmp_seq 15
Request timeout for icmp_seq 16
^C
--- 8.8.8.8 ping statistics ---
18 packets transmitted, 0 packets received, 100.0% packet loss
I followed this with a traceroute command to the same server.
Rays-iMac-8:~ lorenzocastoldi$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
1 * * *
2 *traceroute: sendto: No route to host
traceroute: wrote 8.8.8.8 52 chars, ret=-1
*traceroute: sendto: No route to host
traceroute: wrote 8.8.8.8 52 chars, ret=-1
^C
I can't find much on this "sendto: No route to host" message, but the few forum posts I was able to find seemed to be made by users of the Linux operating system, or variants thereof, making me even more certain that the issue is with my modem, cable, or ISP. After running Network Diagnostics again, I got this
Rays-iMac-8:~ lorenzocastoldi$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
1 10.0.1.1 (10.0.1.1) 2.198 ms 1.216 ms 2.369 ms
2 * * *
3 67.59.227.133 (67.59.227.133) 31.147 ms 8.546 ms 10.267 ms
4 rtr2-ge1-18.mhe.whplny.cv.net (67.83.231.5) 15.358 ms 22.261 ms 12.545 ms
5 65.19.121.217 (65.19.121.217) 14.326 ms
65.19.121.209 (65.19.121.209) 16.525 ms
r1-ge6-1.cst.nrwlct.cv.net (65.19.121.161) 14.141 ms
6 451be0d6.cst.lightpath.net (65.19.120.214) 12.331 ms 17.755 ms
451be0ca.cst.lightpath.net (65.19.120.202) 14.891 ms
^C
for traceroute, and this
PING 10.0.1.1 (10.0.1.1): 56 data bytes
64 bytes from 10.0.1.1: icmp_seq=0 ttl=255 time=2.135 ms
64 bytes from 10.0.1.1: icmp_seq=1 ttl=255 time=2.478 ms
64 bytes from 10.0.1.1: icmp_seq=2 ttl=255 time=2.179 ms
64 bytes from 10.0.1.1: icmp_seq=3 ttl=255 time=1.058 ms
^C
--- 10.0.1.1 ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.058/1.962/2.478/0.539 ms
for ping, in that order. I believe I've heard that the second entry in traceroute, with the three asterisks, is my router. Whenever I run traceroute, entry 2 is always like this, and I think this is the case for other people as well. This would mean, if I am not mistaken, that the first IP address, 10.0.1.1, is the weak link. However, I do not know how to proceed from here. When I traceroute other websites, it always appears as IP address number one, and it is contacted before my router, if #2 is in fact my router. I have read that 10.0.1.1 is also a private IP address, though I do not know exactly what that would mean for me. I am tempted to think that this IP address may be my computer itself, but that wouldn't make sense. It may be my router, again, but I do not know this for certain.
Because this is an intermittent problem, it can be difficult to examine it in any detail, but I should be able to answer most questions about it. If anyone has any potential solutions, or even hypotheses as to the nature of the problem, please let me know. I cannot solve this problem on my own.
tl;dr: What is the 10.0.1.1
I acknowledge that service outages are common, but they shouldn't interfere with my computer's connection to my router, nor should they last for weeks straight or be temporarily resolved by running a diagnostic tool. Plus, my phone and T V would probably go down in that scenario, except for some very special situations. Electromagnetic interference is an explanation I hadn't considered before, but I don't run a cell phone or microwave all day, but only every other month. I'll look into it though—maybe I'll see how my computer communicates with my router during an interruption, or see if any large electronics are running at the time. However, my connection's been fine since I started this thread, when I restarted my base stations. Maybe that's all I needed to do after all. A strange issue nonetheless, though.
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If the issue persists, please help to collect following information for further research:
1) Enable RAS Tracing on the client.
- Over an Administrative command prompt.
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2) On the client enable the following log as well:
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4) Disable RAS Tracing on the client.
- Over an Administrative command prompt.
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5) On the client disable the following log as well:
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6) Please provide the following files:
From the Client:
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Upload these files in SkyDrive and post back the shared link.
Keep post.
Kate Li
TechNet Community Support -
Hi!
I wish someone can help me on this, I'm a new guy on cisco firewalls and I'm currently implementing cisco asa 5512x, here are the details:
ISP -> Firewall -> Core switch -> Internal LAN
after installing the cisco asa and terminating the appropriate lan for the outside and inside interfaces, internet seems intermittent and cisco vpn client can connect with internet connection but can't ping internal LAN.
here's my configuration from my firewall.
ASA Version 8.6(1)2
hostname ciscofirewall
enable password 2KFQnbNIdI.2KYOU encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address 203.x.x.x 255.255.255.0
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address 10.152.11.15 255.255.255.0
interface GigabitEthernet0/2
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/4
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/5
shutdown
no nameif
no security-level
no ip address
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
ftp mode passive
dns domain-lookup outside
dns domain-lookup inside
dns server-group DefaultDNS
name-server 4.2.2.2 -------> public DNS
name-server 8.8.8.8 -------> public
name-server 203.x.x.x ----> Clients DNS
name-server 203.x.x.x -----> Clients DNS
same-security-traffic permit intra-interface
object network net_access
subnet 10.0.0.0 255.0.0.0
object network citrix_server
host 10.152.11.21
object network NETWORK_OBJ_10.10.10.0_28
subnet 10.10.10.0 255.255.255.240
object network NETWORK_OBJ_10.0.0.0_8
subnet 10.0.0.0 255.0.0.0
object network InterconHotel
subnet 10.152.11.0 255.255.255.0
access-list net_surf extended permit ip any any
access-list net_surf extended permit ip object NETWORK_OBJ_10.10.10.0_28 object InterconHotel
access-list outside_access extended permit tcp any object citrix_server eq www
access-list outside_access extended permit ip object NETWORK_OBJ_10.10.10.0_28 any
access-list outsidevpn_splitTunnelAcl standard permit 10.152.11.0 255.255.255.0
access-list LAN_Users remark LAN_clients
access-list LAN_Users standard permit any
access-list vpnpool extended permit ip 10.10.10.0 255.255.255.248 any
pager lines 24
logging enable
logging asdm informational
mtu management 1500
mtu outside 1500
mtu inside 1500
ip local pool vpnpool 10.10.10.1-10.10.10.6 mask 255.255.255.248
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
nat (inside,outside) source static NETWORK_OBJ_10.10.10.0_28 NETWORK_OBJ_10.10.10.0_28 destination static NETWORK_OBJ_10.10.10.0_28 NETWORK_OBJ_10.10.10.0_28 no-proxy-arp route-lookup
object network net_access
nat (inside,outside) dynamic interface
object network citrix_server
nat (inside,outside) static 203.177.18.234 service tcp www www
object network NETWORK_OBJ_10.10.10.0_28
nat (any,outside) dynamic interface
object network InterconHotel
nat (inside,outside) dynamic interface dns
access-group outside_access in interface outside
access-group net_surf out interface outside
route outside 0.0.0.0 0.0.0.0 203.x.x.x 1
route outside 10.10.10.0 255.255.255.248 10.152.11.15 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
aaa authentication telnet console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
http 10.0.0.100 255.255.255.255 inside
http 10.10.10.0 255.255.255.240 outside
http 0.0.0.0 0.0.0.0 outside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec ikev1 transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto map inside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map inside_map interface inside
crypto ikev1 enable outside
crypto ikev1 enable inside
crypto ikev1 policy 10
authentication crack
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 40
authentication crack
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 70
authentication crack
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 100
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 120
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 130
authentication crack
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
client-update enable
telnet 10.152.11.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
threat-detection basic-threat
threat-detection statistics
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
webvpn
enable outside
anyconnect-essentials
group-policy outsidevpn internal
group-policy outsidevpn attributes
dns-server value 203.x.x.x 203.x.x.x
vpn-tunnel-protocol ikev1 l2tp-ipsec ssl-client
split-tunnel-policy tunnelall
split-tunnel-network-list value outsidevpn_splitTunnelAcl
default-domain value interconti.com
address-pools value vpnpool
username test1 password i1lji/GiOWB67bAs encrypted privilege 5
username test1 attributes
vpn-group-policy outsidevpn
username mnlha password WlzjmENGEEZmT9LA encrypted
username mnlha attributes
vpn-group-policy outsidevpn
username cisco password 3USUcOPFUiMCO4Jk encrypted privilege 15
tunnel-group outsidevpn type remote-access
tunnel-group outsidevpn general-attributes
address-pool (inside) vpnpool
address-pool vpnpool
authentication-server-group (outside) LOCAL
default-group-policy outsidevpn
tunnel-group outsidevpn ipsec-attributes
ikev1 pre-shared-key *****
class-map inspection_default
match default-inspection-traffic
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
inspect icmp
inspect http
inspect ipsec-pass-thru
class class-default
user-statistics accounting
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
hpm topN enable
Cryptochecksum:edc30dda08e5800fc35b72dd6e1d88d7
: end
thanks. please help.I think you should change your nat-exemption rule to smth more general, like
nat (inside,outside) source static any any destination static NETWORK_OBJ_10.10.10.0_28 NETWORK_OBJ_10.10.10.0_28 no-proxy-arp route-lookup
'cause your inside networks are not the same as your vpn-pool subnet.
Plus, if you're trying to reach inside subnets, different from 10.152.11.0 255.255.255.0 (ip from wich subnet is assignet to your inside interface, and for wich above nat exception should be enough), you should check if routing is configured from that subnets to your vpn-pool-subnet through the ASA. -
Error sending emails to Internet: Failed to connect. Winsock error code: 10051
Our exchange 2013 CU2 (CAS+MBX, Win2012) was sending emails to Internet using another server (a kerio email server) and outbound internet email was working as expected.
We have now removed the Kerio server, I also removed the kerio_Send_Connector I was using to send emails to internet and I also changed the email domain in Exchange to be authoritative. I created a new Internet send connector with default values, but the same
bad behavior is present.
Our Exchange 2013 receives emails internally and externally with no problems. The problems are sending emails to Internet. I am suspecting something in the firewall but i need to do some more research.
If from the same Exchange server I telnet to an Internet email host:25 I do get the smtp banner but as soon as I start typing HELO/EHLO I get disconnected and errors are logged.
Errors when sending emails to any emails address (this is from an email sent to google, all others are the same):
Remote Server at aspmx3.googlemail.com (74.125.136.26) returned '400 4.4.7 Message delayed'
7/1/14 9:52:44 a. m. - Remote Server at aspmx3.googlemail.com (74.125.136.26) returned '441 4.4.1 Error encountered while communicating with primary target IP address: "Failed to connect. Winsock error code: 10051, Win32 error code: 10051." Attempted
failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 74.125.136.26:25'
I cannot find any references from such Winsock error that are related to Exchange 2013.
So far all email is being queued at the Exchange Server 2013. I am afraid to install CU3 and make things worse.
Thanks for your comments.Just check if the receive connector settings are set to fine
check the send connector properties and see whether it is set to use DNS to route emails through external DNS/Internal DNS or smart host .
Do a telnet to external domain like hotmail,yahoo and see at what transaction you are getting an error
Enable verbose logging, restart the transport service and check if you get the same error in the verbose logs as well
Get in touch with the ISP and see if the port 25 for Outbound SMTP is opened.
YOu can check if SMTP Proxy is enabled in the firewall. If so disable the SMTP proxy in the firewall and check.
Good Luck!!
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.
That will encourage me - and others - to take time out to help you.
Regards,
Sathish -
Internet Connection fails upon startup (and from sleep)
I've brought a brand new iMac a week ago and continue to have problems with the internet. I have a very fast and stable connection from a homehub (wireless).
This is what it looks like when I go to diagnostics when the internet fails:
Green - Wi-Fi
Green - Wi-Fi Settings
Green - Network Settings
Orange (sometimes Red) - ISP
Orange - Internet
Orange - Server
From 'Network Diagnostics' I click on the continue get to the "select network stage" and then it says that "your internet connection appears to be working correctly" - I have to do this every time to 'wake-up' the internet!
I just wondered if it was something that I have to keep doing or if it's a problem which can be resolved.
Thank you!Your warranty includes 90 days of phone support. Call AppleCare.
-
Mac failing to connect to ethernet network/internet
Help this is driving me nuts. My mac connects to the network only intermittently. I have 3 macs networked via ethernet, connect to a switched ethernet hub which is connected to a dsl router. There are other PC's in the building that connect to this wired network and thus the internet. All the 3 macs (running leopard, all upates installed) have been set up using DHCP and all has been fine for years. Now one mac has trouble connecting to this network. The error messages imply the internet connection is at fault but both other macs and the PC's are connecting OK. I suspect its a network issue as the other macs can not see the faulty mac when it's playing up. I don't understand why 2 work fine but not the other. At times I could surf the net but mail failed to connect saying it could not connect to a server port. Now the mac seems to have dropped of the network completely - but it seems to see a ethernet connection when running diagnostics. I have not posted any error messages because they all seem to differ and are not consistent. Should I start again? what's the best way to set up a network like mine - it has been run like this for many many years. Am posting this on one of the other macs as the faulty mac has been offline for days now. Weeks ago we did have a similar problem on the third mac but after 1/2 hour and restarting the hub it has been running fine ever since. Thanks for reading this and if you need any more specific info, or for me to run a test and report the results, let me know.
Hi Suggsy-
Your hub (switch?) could be failing. It is possible for one port to become flakey while the others all work fine. Can you try another port?
If that fixes it, combined with the other problem from weeks ago, it may be time to replace the hub.
If that does not fix it, be sure to try a new ethernet cable.
Luck-
-DP -
Since installing mavericks my imac keeps failing to connect to the internet
what is wrong with my mac i have just installed mavericks and my internet connection keeps failing any ideas
Please answer as many of the following questions as you can. You may already have answered some of them; in that case, there's no need to repeat the answers.
Restart your router and your broadband device, if they're separate. Any change?
If possible, connect to your router with an Ethernet cable and turn off Wi-Fi. Any difference?
Are any other devices on the network, and if so, are they the same?
If you can connect to more than one network, are they all the same?
Are all network applications affected, or only some? If only some, which ones?
Is networking always the same, or is the problem intermittent?
Disconnect all other devices from the network. Any change?
Start up in safe mode and test. Any difference?
Start up in Recovery mode. From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. Any difference?
If possible, turn off Bluetooth and disconnect any USB 3 devices. Any difference? -
Printer worked fine yesterday! Today it says 'Job printing on server - waiting for printer to become available' . Network Diagnostics says there is a working internet connection but it cannot find the Epson Stylus Office BX305@my iMac address. Any ideas?
The Network Diagnostics shows a green light for Ethernet, Network Settings, ISP and Internet but the Server is red and says Failed: the Message reads 'This computer appears to have a working Internet connection, but cannot find "EPSON". You may have typed the address incorrectly." (Not aware of having typed any address, correctly or otherwise, and it was working fine until now! The ? button says:
Can’t connect to the server you’re looking for
Network Diagnostics has determined that your Internet connection appears to be working and can connect to the Internet, but can’t connect to the server you are looking for. There may be something wrong with the server you are trying to reach.
Wait a few minutes and then try again.
If you continue to have problems, contact your Internet service provider.
Is that the problem do you think?
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