try these steps

来源: ohlalala 于 2006-08-29 17:20:53 [] [旧帖] [给我悄悄话] 阅读数 : (201 bytes)

1. check the date/time is properly set on the problematic pcs
2. turn off the firewalls on the pc and try again. If XP sp2 is
used, you need to add msn messenger in its allowed application list.

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