hi
did you do any kind of refresh operation for the desktop image of these users?
also, for the users that work vs don't work - are they all accessing internally via the LAN or are some connecting in via a security server?
has there been any change to firewall rules?
So to confirm - yes, usb uses port 32111, but if you are connecting via the security server then it is tunnelled (or at least needs to be).
please answer the basic questions above, and then if its still not working, maybe you can send me a debug log from a non-working agent and client, and I can take a look and try and figure out the issue.
cheers
peterB