SSH Connection Problems

[pyrodie18]

Could use some help here. I have an older version of Cirrus Config Manager that I used to upload config changes. It logs in to systems using SSH. Occasionally after it logs in though, something happens and I can no longer connect using SSH to that device unless I reboot it (telnet still works). Using putty, I get a message saying that the "Server unexpectedly closed network connection". After a reboot, I can get into the router (this seems like it is only happens on routers, and not switches). I know I have read that this happens if you change the hostname of the device, but the host name hasn't changed when this happens. I have tried to delete and regenerate the RSA key, but still no luck.

Thanks,

Troy

[glen.grant]

It can also happen if you have to replace the device and or supervisor as the new key will not match the stored key in the device you are ssh'ing from, I have seen this going from a unix device and you have to clear the key for that device and make a new one . Also make sure you have your exec-timeout parameters set on the vty sessions.