Cannot logon to new wlc

[eigrpy]

Hi SecureCRT and putty can logon to WLC, but the new WLC ver 8.10 cannot be accessed. The below is error message from SecureCRT:

Any solutions? Thank  you

Key exchange failed.
No compatible MAC. The server supports these MACs: hmac-sha2-256,hmac-sha2-512

[kubn2]

Hi,

So this error shows that SecureCRT and putty don't support algorithms supported by the WLC. 

For SecureCRT go to Options -> SSH2 -> Advanced and make sure that sha2-256 and sha2-512 are enabled, if they are not listed you might need to update it to the newest version.

[eigrpy]

Thank you very much!

[Rich R]

Basically your terminal software is using old insecure crypto settings and the the latest code on WLC defaults to newer secure crypto settings. There is a way to trick AireOS into using less secure settings but that involves downgrading code, changing config and then upgrading all in the right order with the right versions so easier to just update your client if you can.