Dear all, we have a problem that has been going on for weeks. We have one exchange site with 5 servers, Ex5.5 sp4 plus patches, NT4 sp6 plus patches. They are all in one NT domain "abc". They have to communication with a PDC in a separate domain xyz for purposes of authentication as all users accounts are in this separate domain. It complains in event logs " cannot find domain controller for xyz domain" error 5719. We know this is a secure channel problem then. So we have trawled the knowledge base and done literally everything suggested anywhere! we have been down the path of nbstat, browstat and all those reskit tools. We found an article where we can run a reskit command "setprfdc xyz <pdcname> and this makes a secure channel to the appropriate PDC. Trouble is the exchange server doesn't stay talking to the PDC, it drops out with 5719, we have to run setprfdc every hour or users cannot access mail!!! Could it be our abc domain controller? We have support call open to microsoft who only suggest everything we have tried and are generally dragging their heels. We've ruled out all the network level stuff, switches NICs etc. Help please, anything we haven't thought of. Other servers in site (same brand) are fine. thanks Vanessa Network Manager Royal Holloway, University of London
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