Issue with ISE upgrade 3.2

[SilentVictory]

Hello all, 

Recently I upgraded my Cisco 3615 server from ISE 2.7 (Patch 9) to ISE 3.2 (Patch 5). The upgrade went smoothly but I can no longer SSH into the CLI. None of the configurations were changed and I only started having this issue once the upgrade was completed. 

The error I receive when using putty is- "Remote side unexpectedly closed network connection"

Any help would be greatly appreciated!

[balaji.bandi]

May be try different client or try latest Putty and check.

if you able to login to GUI check the Logs what is the error ?

[PSM]

As @balaji.bandi  mentioned try using different SSH client like SecureCRT or Putty. We had faced an issue when applied patch 4 (not 5) where we were not able to login using local admin account . We had to recover the password to regain the access. But in your case it looks SSH connection issue. 

[adamscottmaster2013]

I ran into this issue before from upgrading from 2.2 to ISE 3.1.  I first upgraded from 2.2 to 2.7 and everything was fine.  I then proceeded to upgrade to ISE 3.1 and ran into the exact same issue.  I contacted Cisco TAC and the /etc/ssh/sshd_config file was corrupted (some lines missing), and had to be restored from another ISE 3.1 system.  It worked after restarting the sshd service from console as "root".