[CentOS] x2go on CentOS6

> The errors you posted were from the client. Assuming you can ssh into
> the remote machine without a problem, do you see error messages there
> on the server?

Thanks, Akemi, you have hit the nail on the head!

The spurious error message was caused by a statement in .cshrc that created output, a stray unescaped exclamation mark in an alias definition. And that with me preaching to my users for years about cleaning up their init files ...

I feel stupid now. But not contagious, thankfully.