i cannot access to any router with SSH

[Muradazz]

Dears,

in the past   i can access to my routers over SSH   now  after upgrade to the latest version  i can't login to any router  and the error is related to SSH connection 

when i try   to add new router  also i have the same problem with ((( The authenticity of host "x.x.x.x" can't be established. RSA Key fingerprint is unavailable))). 

I upgrade to the last release and the same issue .

[Muradazz]

this is the log  on my router since i use  radius server with username and password   to login to my routers over SSH

RP/0/RP0/CPU0:Jul 11 07:20:05.945 GMT: SSHD_[65678]: %SECURITY-SSHD-6-INFO_GENERAL : Client closes socket connection
RP/0/RP0/CPU0:Jul 11 07:20:05.946 GMT: SSHD_[65678]: %SECURITY-SSHD-3-ERR_GENERAL : Error in receiving key exchange packet
RP/0/RP0/CPU0:Jul 11 08:11:05.516 GMT: SSHD_[65602]: %SECURITY-SSHD-6-INFO_GENERAL : Client X.X.X.X closes socket connection
RP/0/RP0/CPU0:Jul 11 08:11:05.518 GMT: SSHD_[65602]: %SECURITY-SSHD-3-ERR_GENERAL : Failed in version exchange
RP/0/RP0/CPU0:Jul 11 08:11:07.955 GMT: SSHD_[65602]: %SECURITY-SSHD-6-INFO_GENERAL : no matching kex found: client ssh-rsa server ssh-dss