Software :: Execute Commands Via Ssh / Working And Failing

I am trying to get F10 installed on L2 so that I can use the system the same way that I have been using L1 with F8. Specifically, I am using unison (with ssh) to crossload files between the desktop and the laptop. Unison works just fine when executed on the desktop crossloading to the F8 Laptop1. But when trying to do the same on L2, it hangs while trying to contact the server.Attempting to diagnose the problem has led me to ssh.I can use ssh to login to any of my systems from the desktop. E.g.,ssh delta

but attempting to execute a command via ssh simply hangs. E.g.,ssh delta "echo $PATH"

Both ssh login and ssh remote execution work fine when done to the F8 laptop 1.

I have installed tcsh on all systems and my login shell is csh (i.e., tcsh) on all machines.I have spent the better part of the last two days trying to find something but have failed. As far as I can tell, both L1 and L2 are configured identically:
firewall disabled
selinux disabled
and while I have not done a character-by-character comparison of the ssh and sshd configuration files, they appear (visually) to be the same, as shipped with the Fedora distribution.

I need some pointers on where to look for problems, etc.