SSH Protocol error

Hi,

Im running serv-u v.8.2.0.3 in a cluster environement. on 1 of the node I receive "ssh protocol error: invalid state for the command from the client" and unable to open private key

I tried to copy the serv-u folder from the working node to the deffective one and still get the same error.

I do not know what the ssh error mean. Would someone have an idea of what may cause these error?

Thanks

Alex