What steps will reproduce the problem? 1. Any pssh command 2. 3.

What is the expected output? What do you see instead? Pssh reports that all ssh commands "Exited with error code 255"

What version of the product are you using? On what operating system? 2.3.1 (port install pssh) on Mac OS 10.8.3

$ ssh -V OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011

Please provide any additional information below. My Mac OS X ssh client would not take SendEnv formatted the way it was with PSSH_NODENUM and PSSH_HOST in the same -o SendEnv argument. Splitting the two variables out like this made it happy and should be acceptable with any version of ssh.

I discovered the ssh command that pssh was running under the hood and found that it tried host verification. I thought this was strange since I had added options to not verify hosts.

I played around with the options to ssh, I found that removing this -o SendEenv option was the key to getting ssh to stop doing this. Ssh chokes on this option the way it is and stops parsing other arguments correctly.

Thanks for tracking this down.