samba - Oct 2000 - The network path was not found

Hi guys!
Problem in following:
Has customized Samba-.2.0.6 as PDC domain MAIN2.
Is still domain MAIN1 which one under management NT4 Server.
All worked well. But in one moment, in two days, I can not address to
domain MAIN2.
Writes following:
The network path was not found.
Domain is seen in NT Explorer.
Suggest in what a problem. Beforehand thank.