回复:有没有iis 6.0管理高手?俺有一个奇怪的401.2问题难以解决
if you have other PCs are working, then the problem is most likely on the client side.
is the Proxy setting different on the not-working PC?
one thing not very sure is, based on your IIS setting (bot Integrated Authentication and Anonymous), seems like no need for user to enter user name and password...