Why my server crash the network?

Hello to all,
we have:
- macpro with SLServer 10.6.2
- some macbook client with SL 10.6.2 (+ VirtualMachine with Win XP SP4)
- some PC clients with win XP SP4
- Airport Extreme manage the network and the VPN
Until server was at 10.6.1 everithing was ok.
After updated to 10.6.2 all Win clients (really and virtualmachine) are disapparead from network list and the win PC are unable to open the network places.
All other services (file sharing, imap...) running fine but we are unable to join any PC in the network.
If I turn off the server, all PC appear again in the network list and everithing is ok. If I turn on the server, they disappear again...
someone have the same experience?
Do you think I need to reinstall 10.6.1?
I'm going to Mac because I detest all win problems, but I'm not so happy!!!
best regards,
Marco

I'd guess you have a business or an application to run here, and could infer you're not currently in a position to troubleshoot this case. This based on the relative lack of details around the symptoms and the current configuration, and around the "crash the network" phrasing. Given you have other tasks and skills here, this usually then means calling in somebody to have a look at the local (and malfunctioning) configuration. Few folks around are IP geeks, after all; it's a pretty weird topic area, and one that touches on a great many areas of expertise.
Mac OS X Server is easier to install and manage than most any other server operating system I've encountered, but running servers still requires knowledge of the individual servers and of networking, or some sort of a support channel or support resource, or a willingness to learn these topic areas from the manuals and the web sites and/or classroom training. Your choice here depends on your budget and on where you want to spend your time.
While re-installing and downgrading might resolve this issue, it doesn't strike me as the best investment of time, and (depending on what happened here) it might not fix the problem.

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