Mark. A good way to "debug" the bridge is to send it SIGUSR1, upon which it will dump to stdout a bunch of information. Apart from that, you cannot see if the bridge is talking to your machine or not, since the bridge is meant to be totally transparent from the DECnet point of view. One other thing: what is your ip address (or dns) and port number, so I can check if my config file still have the right values...? Johnny Mark Wickens wrote: I think I may have been experiencing multiple points of failure. Steve has kindly brought up the MULTINET tunnel to his systems, but it looks like the link to MIM is still down: NCP>show known circuits Known Circuit Volatile Summary as of 22-SEP-2010 08:01:44 Circuit State Loopback Adjacent Name Routing Node ISA-0 on TCP-0-19 on 19.41 (SG1) What should I be seeing on the bridge to indicate that BUBBLE is talking to it correctly? I'm presuming when the link is up I should see a routing node against ISA-0 on the above circuit list? Regards, Mark.