Cannot use SSH client

Hi, I'm trying to use the embedded ssh client for connecting to my network switches (HP, Aruba) but with no success. I've already set the "skip environment variable setup" but It still does not work I get the error on the second image. If I try to connect to a linux machine I have no problems. What can I do?
PS: No problems if I open the ssh to my switces with putty

Regards
Matteo