I used to have that issue... I was running a win2k domain setup. It turned out to be a DNS lookup problem. Win2k domains like to look at the internal domain server first then parse out to external dns. The first attempt, which it would fail, would be the internal lookup. The subsequent lookup, which would pass, would come from the external dns server. Since I set up new pc's running xp-64, I haven't had that issue since I no longer run a domain (well I do, but the gaming pc's dont log into the domain).
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