"Suddenly" unable to find domain at logon

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We are running two w2k3 (without sp1 !) terminal services servers with
citrix presentation server 4. Once every (second) week we have to reboot the
servers because the users are unable to logon to the domain. It goes fine to
logon locally, reboot the server and everything work fine for a while.
Citrix Presentation server 4 do not allow us to apply w2k3 sp1.

We have several error messages like unable to find domain, the RPC server is
unavailable. Event ids like 1053,1219,1055,1097,1030. We have seen solutions
like 822820 and 883670 and so on but no one that seems just the right one.

Could you please help us out

Sincerely

\\Jonas B


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