Need urgent help about sql connection denied

From the same web server to sql server, ASP pages work fine, but .NET pages get "SQL Server does not exist or access denied" error message.
Environment:
both are Windows 2000 sp4,
sql server 2000 sp4
not firewall between
Everything is okay before I got some windows security updates fails on the sql server! and I reboot the sql server!
What happened with the security update? Why does it only effect the .NET pages not the ASP pages? They even use the same connection string!
Thanks for any comment

Are you using integrated security? That is, are you passing in a user name and password (in which case you are using SQL Server security) or not (in which case you are using integrated security). ASP and ASP.NET operate under different security contexts. ASP operates as IUSR_<machinename>, whereas ASP.NET operates under the security context of the ASPNET windows user.

I have no idea what the security update would have done.

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Thanks for the reply.
I do pass a user name and password in the connection string. it's the same string that I used in the ASP pages. it works fine. But I reboot the servers, only the ASP pages work.
the string looks like "DATABASE=fansion;server=dbsvr; uid=sa; pwd=password;"

|||Just tested, this problam only happens on the windows 2000 web server, windows 2003 is fine.|||

Did you ever get an answer for this re: sql connection - same string works under asp, not under asp.net, with userid= and password= and not with a dsn?

thanks a lot

Neil Jay warner