[App_rpt-users] Two Nodes/one pc problem

Got a "weird" one folks.... We recently set up our hub pc to have a 2nd hub on the same pc. The two hubs purpose is to have 440/220 rpts on one hub and all the 900 rpts on the other, That way 900 is stand alone 99.9% of the time. And when we need to link them, we can. So we have 27132 (440/220) hub and 2325 (900 hub) running one one pc and one Ethernet card. All is fine until we link 132 and 25 together. Then, having puttied into 132- we get a message :disconcerting from asterisk server" and ALL connections drop. It is like asterisk resets itself. Any ideas?