Can't connect to PC server from Mac after PC is put behind switch.NE ideas?

After adding a switch in my network i bumped into some network trouble.
Here's my new setup:
Airport Extreme
iBook via WIFI
Airport Express - LAN cable - SWITCH - PC/XBOX360/PS2
All computers have internet access, i can access PC via VNC on my iBook, but connecting to server on my PC (win XP) on iBook is not possible anymore
I used to have this set up:
Airport Extreme
iBook via WIFI
Airport Express - LAN cable - PC
Here I had no trouble at all.
Any hints and suggestions are highly appreciated.

Resetted all devices and now it's up and running again. Solved

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Can't connect to PC server from Mac after PC is put behind switch.NE ideas?

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