This has just started happening in the last few days (pretty much around the time since I got kerberos working for OSX clients. The OS9 clients all use guest access (OS9 is going away very soon).
They can mount the first share fine. When they go through the chooser to mount another share from same server they get a "No Response from the Server" dialog. The server is still there, and they can use an alias from Recent servers to connect with no problems at all.
Anyone have any ideas what is going on here?