I can get a connection between 3com connection manager and the 7650, and can succesfully send and receive files, images etc. But when I try to setup mrouter using COM5 (the serial host as per connection manager) I get the error "unable to open port". There are no other apps running except connection manager. This error comes up on all com ports when I select them (except 123). Anyone any ideas? This is getting frustrating!