cann't receive wbem indication on one of the sim cluster

[speedwolf]

Hi,I have a weird problem when using sim cluster.
I installed sim server on win2k3 in a clustering environment (ser1 and ser2).I can configure a managed node "A" very well and receive the testing wbem indication from it. But when I switch sim from ser1 to the ser2 , everything is still fine(including the smh,property..),except the indication: I cann't receive the testing indication from node "A" which i just configured before the switching anymore. Also, if i configure another managed node "B" and make everything well, then i switch my sim server back to ser1, I cann't receive the indication from B, but I can receive the indications from A now. I guess that because I confiured node "A" in ser1 in the beginning.
I hope i have stated my problem clearly. Anyone can give me suggestions?
Thanks in advance!

[speedwolf]

nobody can help me? plz...