Ssh into HP Proliant dl360 gen9

I flashed the silence of the fans firmware, but I'm not able to ssh into my server.

Putty: remote side sent disconnect message type 11 (by application): "Client Disconnect"

I have tried a factory reset, and I can connect to the iLo through a browser.

I hope that there is a friendly person, that can walk a noob like me through it step by step. My girlfriend is on the verge of throwing me and the server out the window. Just to get some peace.

Thanks in advance.