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
