Unable to telnet to a switch

After executing the following command: 'clear tcp tcplist', I am no longer able to telnet to the 6513 switch (CatOS). I would like to restore the telnet functionality to this switch. Does anyone have an ideas. I have searched everywhere for a resolution. Thanks.

Hello,
the command you mention drops all TCP connections. Where are you trying to telnet from ? Check the line status of that device with the 'show line' command, and try to clear all lines which have an *.
Regards,
GP

Similar Messages

Unable to Telnet / SSH to a particular cisco switch

Hello,
I have an unusual issue that I just can't seem to track down. We have a Windows Server 2008 R2 box that is unable to telnet or ssh to one switch in our network.
Server IP: 10.0.0.74
Cisco Switch IP: 10.1.0.7
I am able to access all other switches/routers on the 10.1.0.x network, but not this one. I ping and tracert by ip address and name.
We have a number other servers on our network and they all can access this switch
Example:
a. 10.0.0.73 can telnet/ssh to 10.1.0.7
b. 10.0.0.72 can telnet/ssh to 10.1.0.7
c. 10.0.0.50 can telnet/ssh to 10.1.0.7
d. My workstation (10.0.250.213) can telnet/ssh to 10.1.0.7
If anyone can help with troubleshooting further, I would greatly appreciate it.

Thanks for the reply Philippe! Here is the route print
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.0.0.2 10.0.0.74 266
10.0.0.0 255.255.0.0 On-link 10.0.0.74 266
10.0.0.74 255.255.255.255 On-link 10.0.0.74 266
10.0.255.255 255.255.255.255 On-link 10.0.0.74 266
10.10.0.0 255.255.0.0 On-link 10.0.0.74 266
10.10.0.74 255.255.255.255 On-link 10.0.0.74 266
10.10.255.255 255.255.255.255 On-link 10.0.0.74 266
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 10.0.0.74 266
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 10.0.0.74 266
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 10.0.0.2 Default
===========================================================================
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
1 306 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
Firewall is disabled and there is no active antivirus. Im pretty sure port blocking is not the issue. I am able to ssh and telnet from this box to every other switch/router in our network.
This server has Solarwinds on it and tracks the health of our network (servers, routers, switches, ups, ect.). The only reason we noticed an issue is because it stopped backing up the config for this particular switch. All other switchs/routers
config is backed up to this server every morning at 2:00AM.
With solarwinds, this server is also able to communicate with this switch via snmp / icmp and ping.
Thanks again for the help!

Unable to telnet and tftp to controller

hello experts!!!
5508 controller is at the headquarters which can be normally pinged, telnetted, http'd and tftp'ed....
at the remote site, controller can be pinged and http'ed but cannot be telnetted and tftp'ed.
there is a complete tracert from the remote site pc all the way to the controller.
from a switch at a remote site, the controller can be telnetted.
but from a pc on the remote site (which belongs to a remote site vlan), it is unable to telnet and tftp the controller.
all active components can be telnetted from the remote site, such as the core switches and routers at the headquearters, except the controller.
upgraded the controller code to 7.2.xxx in headquarters but still unable to telnet and tftp the controller from remote site.
is there any more settings on the controller for telnet and tftp?
what could be the problem why the controller is not available for telnet and tftp from the remote site?
thank you, experts, in advance for your replies!!!

Hello, Leo!
See output of the command:
(Cisco Controller) >show network summary
RF-Network Name............................. GID2012
Web Mode.................................... Enable
Secure Web Mode............................. Enable
Secure Web Mode Cipher-Option High.......... Disable
Secure Web Mode Cipher-Option SSLv2......... Enable
OCSP........................................ Disabled
OCSP responder URL..........................
Secure Shell (ssh).......................... Enable
Telnet...................................... Enable
Ethernet Multicast Forwarding............... Disable
Ethernet Broadcast Forwarding............... Disable
AP Multicast/Broadcast Mode................. Unicast
IGMP snooping............................... Disabled
IGMP timeout................................ 60 seconds
IGMP Query Interval......................... 20 seconds
MLD snooping................................ Disabled
MLD timeout................................. 60 seconds
MLD query interval.......................... 20 seconds
User Idle Timeout........................... 28800 seconds
ARP Idle Timeout............................ 300 seconds
Cisco AP Default Master..................... Enabled
--More-- or (q)uit
AP Join Priority............................ Disable
Mgmt Via Wireless Interface................. Enable
Mgmt Via Dynamic Interface.................. Enable
Bridge MAC filter Config.................... Enable
Bridge Security Mode........................ EAP
Mesh Full Sector DFS........................ Enable
AP Fallback ................................ Enable
Web Auth Redirect Ports .................... 80
Web Auth Proxy Redirect ................... Disable
Web Auth Captive-Bypass .................. Disable
Web Auth Secure Web ....................... Enable
Fast SSID Change ........................... Disabled
AP Discovery - NAT IP Only ................. Enabled
IP/MAC Addr Binding Check .................. Enabled
CCX-lite status ............................ Disable
oeap-600 dual-rlan-ports ................... Disable
oeap-600 local-network ..................... Enable

Unable to telnet or user disconnected

Hi,
It seems that every time a client/server application runs extensively on the Sun Solaris 7 server, users who are already connected to the server got disconnected or we're unable to telnet or ping the server (connection got timeout). I increased the pty's to 128 but still no luck. Traffic on the switch seems ok.
Any idea someone.?
Pls help
Rales

Are you able to console to the access point? Do you have an ACL preventing telnet or HTTP access to the AP? Is there a chance that HTTP and telnet are disabled on the AP?
Mark

Unable to telnet SLM224G2

hi.
i am able to ping my SLM224G2 switch but unable to telnet the switch.
pls. help me out.
Jitendra

I am not sure if the SLM224G2 if you can telnet the unit but if it does have that option usually you might have some enabled firewalls in the PC that is why you are unable telnet the unit. I tried to further look at either the user guide or datasheet for the SLM224G (anyway the SLM224G2 should belong to that family) and it doesn’t say that it has a telnet capability. I am honestly not familiar with this switch but I know the SRW series has telnet capabilities. I suggest try contacting CISCO tech support to report about this problem and seek their opinion about it.

Unable to Telnet...............

Posted by: vatsey.sharad - Engineer, HCL Comnet
Jun 6, 2008, 2:09am PST
Hi,
I have two IP's Configured on my Cisco 2800. 1.1.1.1 - Loopback and 2.2.2.2 on Fast Ethernet. Both IP's are pingable across the WAN. And telnet to loopback IP is working fine. However I am unable to telnet to Fast Ethernet IP. The error message while trying to telnet to Fast Ethernet IP is: "Could not open connection to the host, on port 23: Connect failed". I tried to debug telnet on the router. The Debug output for unsuccessful telnet is as follows:
Telnet194: recv SB NAWS 139 24
However for a successful telnet session, the output is:
Telnet195: 1 1 251 1
TCP195: Telnet sent WILL ECHO (1)
Telnet195: 2 2 251 3
TCP195: Telnet sent WILL SUPPRESS-GA (3)
Telnet195: 80000 80000 253 24
TCP195: Telnet sent DO TTY-TYPE (24)
Telnet195: 10000000 10000000 253 31
TCP195: Telnet sent DO WINDOW-SIZE (31)
TCP195: Telnet received DO ECHO (1)
TCP195: Telnet received DO SUPPRESS-GA (3)
TCP195: Telnet received WILL TTY-TYPE (24)
Telnet195: Sent SB 24 1
TCP195: Telnet received WILL WINDOW-SIZE (31)
Telnet195: recv SB NAWS 110 52
Telnet195: recv SB 24 0 ANSI
There are no ACL's or firewalls involved in the picture.

Sharad
How many forums did you post this question in? I have already found it in 2 other forums.
HTH
Rick

Unable to telnet to LINUX desktop

I've installed Linux 2.6.9-42.0.0.0.1 ( downloaded from oracle's website) and I'm unable to telnet to this machine from my laptop.
I get this error
C:\Documents and Settings\Administrator>telnet oragrid
Connecting To oragrid...Could not open connection to the host, on port 23: Connect failed
This is my first linux trial so I guess you need to tell me from scratch regarding starting the telnet.
Thanks
Mukul

Mukul,
Search this forum for "telnet". You'll see threads such as this one:
Re: FTP & TELNET in Enterprise Linux
Bottom line, I recommend you use ssh rather than telnet. If you're connecting from Windows, download Putty, for example.
Sergio

Unable to telnet to localhost after CU5

Hi
We upgraded E2013 to CU5 on Sat 13 - On Thu 18 at 9:12 all 4 CAS servers stopped processing mail
error from smarthost:
421 4.3.2 The maximum number of concurrent connections has exceeded a limit, closing transmission channel
unable to telnet locally: telnet localhost 25
421 4.3.2 Service not available
netstat -an | find "25" shows port is listening
Test-SmtpConnectivity shows success
Any ideas appreciated
shapi

Hi ,
Please check the below mentioned links
http://social.technet.microsoft.com/Forums/exchange/en-US/6cb89070-6c17-4f80-8ad1-b4bfff8c8ed6/432-the-maximum-number-of-concurrent-connections-has-exceeded-a-limit-closing-trasmission-channel
http://social.technet.microsoft.com/Forums/exchange/en-US/62ccfbd1-9b1e-4e67-94be-692b725428a3/exchange-cas-array-exceeds-max-number-of-concurrent-connections?forum=exchange2010
Please reply me if you have any queries.
Thanks & Regards
S.Nithyanandham
Thanks S.Nithyanandham

Im unable to login when i switch on the laptop? please help me out.

hello,
yesterday I installed os yosmite on MacBook pro. today im unable to login when I switch on, my laptop. please help me out as soon as.

Hi, I have a similar problem. When I try to log in all I get is a light greyish screen. absolutely nothing else, I wish now that I had not loaded Yosimite. I have tried to Safe Start - to no avail. it is very frustrating and I think apple should not use this technology until it is properly set up. However that does not solve my problem. Can anyone assist me ASAP. Thankyou John L

How to telnet to Edge Switch

Dear Experts,
I'm going to try configure on how to telnet to Edge switch but still no result. My Network topology is below:
- 1 Core Switch 3560
- 3 Edge Switch 2960
I'm configured 4 VLAN:
+ Vlan 19: 10.19.10.0/24
+ Vlan 20: 10.20.10.0/24
+ Vlan 21: 10.21.10.0/24
+ Vlan 22: 10.22.10.0/24
On each Vlan, I was assigned Vlan interface IP.
I'm using VTP mode (Server and client) to trunking VLAN and Core SW is standing a VTP Server. I can telnet to Core SW using VLAN Interface IP.
The question is how can I configure to telnet to Edge SW?
Has somebody help me on this?
Thanks in advance!
JH

Hi,
From looking at your topology, the configuration should work. You should be able to telnet into the edge switches from anywhere in the network using the ip addresses of the vlan interfaces on each switch.
What exactly is the issue you're experiencing?
Are you able to ping the switch ip addresses?
Looking forward to hearing from you

Unable to telnet on command prompt for udp port 514, but able to on cmd for tcp port 514

I am unable to telnet on command prompt for udp port 514. But when I use packet snifer or wireshark I am able to see traffic going to the targetted server from udp port 514. I thought it might be a firewall issue blocking the port from communicating. But
I figured out that windows firewall is disabled. I am able to make similar connections on the cmd for tcp port 514.
I did a netstat -an and see that udp:514 is enabled and listening on the server.
What am I missing here?

Telnet actually supports TCP only. You might want to try another tool as suggested here: http://serverfault.com/questions/263032/how-to-connect-to-a-udp-port-command-line
This posting is provided AS IS with no warranties or guarantees , and confers no rights.
Ahmed MALEK
My Website Link
My Linkedin Profile
My MVP Profile

Can only telnet from other switches to a SG300 switch. Also can't access web interface.

For whatever reason I can telnet from another switch to the SG300 switch but not directly to the switch. I also can't access the web interface or ping the switch. Any help would be appreciated. Here is the running config
config-file-header
WasteWaterSG30010MPP
v1.3.5.58 / R750_NIK_1_35_647_358
CLI v1.0
set system mode switch
file SSD indicator encrypted
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end xxxxxxxxxxxxxxxxxxxxxxxx
vlan database
default-vlan vlan 2
exit
vlan database
vlan 2,75,200,999
exit
voice vlan id 200
voice vlan oui-table add ________
voice vlan oui-table add _phone_____________
voice vlan oui-table add ___________________
voice vlan oui-table add ______________
voice vlan oui-table add
voice vlan oui-table add ___________
voice vlan oui-table add ___
voice vlan oui-table add ______________
hostname WasteWaterSG30010MPP
line console
exec-timeout 0
exit
line telnet
password 382fda4a4a26e6637edac0eb8b8ba4581087d32d encrypted
exit
line console
password 382fda4a4a26e6637edac0eb8b8ba4581087d32d encrypted
exit
enable password level 15 encrypted 382fda4a4a26e6637edac0eb8b8ba4581087d32d
username admin password encrypted 382fda4a4a26e6637edac0eb8b8ba4581087d32d privi
lege 15
snmp-server location XXXXXXXX
snmp-server community String1 ro view Default
sntp server 172.16.2.1
ip telnet server
interface vlan 2
ip address 172.16.2.23 255.255.255.0
no ip address dhcp
interface gigabitethernet1
storm-control broadcast enable
storm-control broadcast level 10
storm-control include-multicast
port security max 10
port security mode max-addresses
port security discard trap 60
spanning-tree portfast
switchport mode access
switchport access vlan 999
macro description ip_phone_desktop
!next command is internal.
macro auto smartport dynamic_type unknown
interface gigabitethernet2
spanning-tree portfast
switchport mode access
switchport access vlan 999
interface gigabitethernet3
spanning-tree portfast
switchport mode access
switchport access vlan 999
interface gigabitethernet4
storm-control broadcast enable
storm-control broadcast level 10
storm-control include-multicast
port security max 10
port security mode max-addresses
port security discard trap 60
spanning-tree portfast
switchport mode access
switchport access vlan 999
macro description ip_phone_desktop
!next command is internal.
macro auto smartport dynamic_type unknown
interface gigabitethernet5
spanning-tree portfast
switchport mode access
switchport access vlan 999
interface gigabitethernet6
spanning-tree portfast
switchport mode access
interface gigabitethernet7
spanning-tree portfast
switchport mode access
switchport access vlan 999
interface gigabitethernet8
spanning-tree portfast
switchport mode access
switchport access vlan 999
interface gigabitethernet9
spanning-tree link-type point-to-point
switchport trunk allowed vlan add 75,200,999
switchport trunk native vlan 2
macro description switch
!next command is internal.
macro auto smartport dynamic_type switch
interface gigabitethernet10
spanning-tree link-type point-to-point
switchport trunk allowed vlan add 75,200,999
switchport trunk native vlan 2
macro description switch
!next command is internal.
macro auto smartport dynamic_type switch
exit

A member of which VLAN ID is that device from which you trying to reach that switch?
Is that device directly connected to switch WasteWaterSG30010MPP? If yes, to which port?
If you are connecting from different VLAN than VLAN2, are you using routing between VLANs? Where is that routing device connected to?
> I also have another switch that connects to the network through this switch and am able to telnet to it.
that second switch member of same VLAN 2? Or management is part of different VLAN?
..too few information to be able to give you final answer.

CSS11501 - Unable to Telnet to VRRP backup interface IP

Hi,
I have 2 units of Cisco CSS11501 which configured running on VRRP active/standby on 2 different VLAN (Circuit). When unit 1 is master unit, I am able to telnet to its circuit IP address, but unable to telnet to any circuit IP of backup unit.
Active unit configuration:
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.183
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.19
!*************************** OWNER ***************************
owner ***
content ***
    vip address 172.19.145.184
    port 80
    protocol tcp
    add service ***
    active
!*************************** GROUP ***************************
group ***
vip address 192.168.50.20
active
Backup unit configuration:
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.183 255.255.255.0
    ip virtual-router 1 priority 90
    ip redundant-interface 1 172.19.145.182
    ip redundant-vip 1 172.19.145.184
circuit VLAN550
ip address 192.168.50.19 255.255.255.0
    ip virtual-router 2 priority 90
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.18
!*************************** OWNER ***************************
owner ***
content ***
    vip address 172.19.145.184
    port 80
    protocol tcp
    add service ***
    active
!*************************** GROUP ***************************
group ***
vip address 192.168.50.20
active
Please help!!
Regards,
Danny Lim

Hi Marko,
That means I could not to configure redundant-interface as I have redundant-vip configured already?
Actually the topology is:
VLAN550 is connecting to server farm
VLAN145 is where user sitting
my current config :
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.183
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.19
    ip critical-service 2 PING_DEFAULT_GATEWAY
!*************************** OWNER ***************************
owner HLRLDAP
content VIP_LDAP_16611
    vip address 172.19.145.184
    port 16611
    protocol tcp
    add service KPG-HV30-3
    add service KPG-HV30-6
    active
!*************************** GROUP ***************************
group Redundant_Server
vip address 192.168.50.20
active
So, I should have change my config like this:
CSS1
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.181
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-interface 2 192.168.50.20
    ip critical-service 2 PING_DEFAULT_GATEWAY
CSS2
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.183 255.255.255.0
    ip virtual-router 1 priority 90
    ip redundant-interface 1 172.19.145.181
    ip redundant-vip 1 172.19.145.184
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.19 255.255.255.0
    ip virtual-router 2 priority 90
    ip redundant-interface 2 192.168.50.20
    ip critical-service 2 PING_DEFAULT_GATEWAY

Unable to open 2 9509 switches at the same time in Cisco Device Manager

Dear Friends,
There are a pair of MDS 9509 switches whose management addresses are 172.16.2.197 and 172.16.2.198.
When we try to manage these Devices through Cisco device manager, the first device opens up without any problem, but when the second 9509 is opened in Cisco Device Manager, it fails giving the following error message:
"Open udp transport failed: Address already in use: Cannot bind"
To get around this issue, if we close the first interface to the 9509 switch, then we are able to open up the second 9509 in Device Manager.
We have this problem only in Cisco device manager. If we open one switch in Cisco device manager and the other switch in Cisco Fabric Manager, it works.
Also, we can telnet to both the devices successfully at a time.
The device manager in use is 4.1.
Please find enclosed the sh version outputs for your kind reference.
Can you please help me understand the cause of this issue?
Thanks a lot
Gautam

Is it always the same MDS that fails to open, or can you open either one first, and then the second one poses the problem (no matter which one is second)?
Can you try from a second work station and see if you can open DM to both switched at the same time? I suspect the address it is complaining about is the local workstation IP, not the MDS IP.
If you open the FM map, then you click on the MDS ICONs, can you open DM to both MDS?
- Mike

Unable to telnet using saprouter.

Hi Guys,
I have a problem in using saprouter. When i m trying to edit the saprouttab I am getting a message that it is unable to open saprouter director. the thing is I dont have the dirctory /usr/sap/saprouter. I am using saprputer from exe folder. This is following error when i m reading the saprouter log.
this is saprouttab file
P * * *
P * * telnet
P * * 23
the following is the log from dev_rout log
trc file: "dev_rout", trc level: 1, release: "46D"
Tue Sep 20 14:15:10 2005
SAP Network Interface Router, Version 34, August 30 1999
command line arg 0:     saprouter
command line arg 1:     -r
ERROR => fopen ./saprouttab (2: No such file or directory) [nixxrout.c   266
6]
***LOG Q0I=> NiRRouttab: fopen (2: No such file or directory) [nixxrout.c 2667]
cannot open ./saprouttab: all routing disabled!!!
Could not open permission table
dev_rout: END
Is there any way to change the path in SAP so that it is directed to /usr/sap/SID/SYS/exe instead of /usr/sap/saprouter which i dont have..
Please reply ASAP this is very urgent.
thank u,
Irshad Mohammed

Hi Guys,
I m getting this log file I think there is some problem here
Fri Feb 15 10:23:49 2008 INIT_LOGFILE
Fri Feb 15 10:23:49 2008 READ ROUTTAB /sapmnt/DEV/exe/saprouttab o.k.
Fri Feb 15 10:24:49 2008 CONNECT FROM C0, host 127.0.0.1 (loopback)
Fri Feb 15 10:24:49 2008 SEND INFO TO C0
Fri Feb 15 10:24:49 2008 DISCONNECT   C0, host 127.0.0.1 (loopback)
Fri Feb 15 14:54:20 2008 CONNECT FROM C0, host 127.0.0.1 (loopback)
Fri Feb 15 14:54:20 2008 DISCONNECT   C0, host 127.0.0.1 (loopback)
Fri Feb 15 14:54:20 2008 SHUTDOWN

Unable to telnet to a switch

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