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SSH suddenly stop working on ASR9k

Introduction:

This document is created from CSC Discussion.

Problem Details:

When customer performs ssh <ip> On ASR9k, we see the below messages on the console.

 

P/0/RSP0/CPU0:Apr 21 05:31:41 : SSHD_[65747]: %SECURITY-SSHD-3-ERR_GENERAL : Failed to allocate pty


RP/0/RSP0/CPU0:Apr 21 05:31:43 : devc-vty[181]: %MGBL-TTY-3-KERNEL : Unexpected internal error encountered 'Resource temporarily unavailable'  : pkg/bin/devc-vty : (PID=557258) :  -Traceback= 4bc37e70 4de37b0c 4de3c3d4 4bc3a2d0 4bc3df28 4bc3540c 4bc3cd00 4ba74650 4ba7514c 4ba702c8 4bc5754c 4bc58464 40000130 40000d18


RP/0/RSP0/CPU0:Apr 21 05:31:43 : devc-vty[181]: %MGBL-VTY-3-SESSION : Error performing TTY session operation 'Checking access parameters for VTY': a194060d, ''tty-server' detected the 'fatal' condition 'TTY SERVER INTERNAL: Unknown error condition': Permission denied'

Workaround:

1) Restart the devc-vty process on the active RSP.

process restart devc-vty location all

2) Use Telnet

Known Affected Releases:

4.2.3.BASE

4.3.2.MGBL

 

Known Fixed Releases:

4.3.2.SP1

4.3.2.SP2

4.3.2.SP3

4.3.4.9i.BASE

5.1.0.SP1

5.1.1.13i.BASE

5.1.11.8i.BASE

5.1.2.5i.BASE

5.2.0.7i.BASE

 

Please Contact TAC for more information.

Related Bug:

CSCuj61034

https://tools.cisco.com/bugsearch/bug/CSCuj61034

Document Source:

https://supportforums.cisco.com/discussion/12182226/asr9k-access-ssh-does-not-work

Version history
Revision #:
1 of 1
Last update:
‎09-30-2014 01:23 PM
Updated by:
 
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