Another issue can be that the clocks on the two servers are off. On the BDC open a command prompt and type NET TIME /SET /Y \[pdc servername]. This should synchronize the two clocks and correct the problem.
Now, for more diagnostics -- you should try running NETDIAG.exe on the PDC and BDC and see what it says. This will perform an analysis of the networking and ability of the servers to contact DNS. On the PDC you should also run the DCDIAG.exe. Both of these utilities should be in the support folder on the Windows CD.
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