The server could not interpret the communication from the client
This is some strange problem thats existed since v3.5U1 to atleast v3.5U3 1. Login to the SSH console: http://kb.herator.se/index.php/article/enable-ssh-login-for-esxi2. Type: /sbin/services.sh restart
Done. Unfortantley this does not always work..., either: 3. Physical. Go to the console and restart all management agents and such...
4. Remote Desktop: Shutdown all VM:s. Login to SSH console: Restart the ESXi server