ssh not working after Wireless Controller 5520 upgrade 8.10.112.0

[sejelmohajj]

ssh not working after Wireless Controller 5520 upgrade to 8.10.112.0, whereas Telnet and HTTPs is working fine. 

[aleopoldie · Accepted solution]

Hello Sejelmohajj,

I recently upgraded a WLC 5520 to 8.10.112.0 and didn't face that issue.

Can you show the output of "show network summary" command ?

Thank you,

Léo

[simone.zulian@axians.it · Accepted solution]

Hello,

I encountered the same issue today after upgrading 5520 WLC to 8.10.112.0. As SSH client I was using SecureCRT and, trying to connect, I received the message

The server has disconnected with an error. Server message reads:
A protocol error occurred. Bye Bye

For SecureCRT I find that I have to change the "Key exchange" with "ecdh-sha2-nistp256". You can find the solution at the following link

https://forums.vandyke.com/showthread.php?p=53113

With Putty client, I didn't have any issue.

So, probably, with the firmware 8.10.112 it is changed the key exchange protocol in ssh connection and with some client you need to change settings manually.

[qruczlevy88]

How if he cannot ssh...?  
I face with the issue as well.
Also we face with wifi issue, after removing copper cant connect to wifi...