MDS-Simulator <-> Device Simulator Connection Sometimes Work, Somtimes not

[UweM]

Hello,

I'm playing around with MDS-Simulator and Device Simulator (on same Machine) using it for Push Applicaction Development...
My Problem is:
Sometimes the connection is working (push over MDS Simulator arrives in BB Device Simulator).. but often the Push Content arrives in the MDS Simulator (I can see something arriving in the Log Window) but the Device Simulator isn't doing anything...

I tried several things: Startig progs in different order, resetting device sim etc... I dont have any clue what to do anymore

Somenone a idea ?
Uwe