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Loss of remote SSH administration and local management access w/error EOF Reached

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TitleLoss of remote SSH administration and local management access w/error EOF Reached
Symptoms
  • SSH Administration loss when attempting to access switch. Locks up
  • Unable to access locally via COM port
  • Device continues to work normally
  • A reset will correct until next event.
Environment
  • Securestack
  • C5K125-48P2
  • 06.81.02.0007
Cause
When attempting to connect to device via SSH receive following error :
Communication error while connecting
There was a problem while connecting to xxx.xxx.xxx.xxx
Key exchange was not finished, connection is closed.
Cannot read full block, EOF reached.
No access via console may also be a concern.
Resolution
Under investigation, please contact GTAC for more assistance.

Suggested action steps to gather data 
  1. Find out SSH client & version 
  2. Try a different SSH client 
  3. If have access via LM, enable debug logging levels (Syslog level 8), attempt an SSH session, see if the switch reports other types of messages.
  4. If access via SSH and LM not viable reboot the switch and repeat 3
Gather all documentation ("show support" and "current.log") if possible BEFORE a reset and AFTER if reset required to gain access.
Additional notes

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