Shaun

Security essentials never presented a problem on my Windows PC. However on the Mac I did get prompted several times to allow or deny Sooloos connections, eg: Sooloos helper I can't remember the others.

When I installed my MC200 the core was switched off I could still see it (as I should be able to) with the Sooloos configuration program from a windows XP PC, and then I was able to switch the core on at which point ControlMac could see it also.

You may also want to try connecting all the Sooloos components to a network switch that supports multicast (Sooloos uses multicast to communicate) and have a single cable from there to the router, broadband routers are not always the best switches!

Russ