PCAnywhere - Can't connect to host

I've set up PCAnywhere many times, but am now having some issues.

 

I have a central location and 4 branches, and from the home office I connect to the other 4 branches.   I've set PCA up identically in all offices.  All are set with a static IP, all have ports 5631 & 5632 forwarded.  The machines are identical, routers and modems identical, etc.   However only 2 of the 4 offices are able to be connected to, the other two keep saying "unable to attach to specified device"

 

I'm at a loss, and I'd really like to have this taken care of today before I send everyone home for the holiday.  Any ideas of what else I should try?