I would suggest the following order of attack (working out from the DSS Server):
- Connect a client directly to the DSS server (you may need a cross-over network cable) using the port that the DSS is currently connected to the network, try all the ports that are available on the DSS
- Change the switch ports that the DSS server is connected to
- Review each of the devices between the clients and the DSS server, change the switch ports used for LAN connectivity.
- Change the switch ports that the test client is connected to
In between each step you want to test connectivity.
Sean
P.S. Change only one thing/connection at a time otherwise you will not be able pinpoint the source of the problem.