我現在是用 apache 2.039 以及 php 4.21 ，架在 win xp sp1

在 apache 的 log 內一直出現這樣的錯誤

[Tue Oct 08 21:26:54 2002] [warn] (64)Unknown error: winnt_accept: Asynchronous AcceptEx failed.
[Tue Oct 08 21:26:56 2002] [warn] (64)Unknown error: winnt_accept: Asynchronous AcceptEx failed.
[Tue Oct 08 21:26:57 2002] [warn] (64)Unknown error: winnt_accept: Asynchronous AcceptEx failed.
[Tue Oct 08 21:28:34 2002] [warn] (64)Unknown error: winnt_accept: Asynchronous AcceptEx failed.
[Tue Oct 08 21:29:17 2002] [warn] (64)Unknown error: winnt_accept: Asynchronous AcceptEx failed.

很奇怪，這樣的訊息一出現之後，網站就停擺了..

請問，這是什麼原因呢？