Hello, I am using Posh-SSH ver. 3.0.0.
I do have an issue "New-SSHSession : Session operation has timed out" when trying to create connection to Cisco SF350, SF550, etc. It uses SSH-2.0-OpenSSH_7.3p1.RL protocol version.
When I am trying to create connection to older models like SF300, that uses SSH-2.0-OpenSSH_5.9p1.RL, it works great!
Cisco updated OpenSSH from 5.9 to 7.3 couse some known vulnerabilities. There is no way to change it back on 5.9.