Setup: Windows 2003 Server
IIS 6
PHP 5.1.5
MSSQL php library 7.0

I have a Windows 2003 server on Active Directory. If I create a website
with the default IIS anonymous account I have an issue connecting to a
mssql database. The error message returned is blank as if I tried to
connect to a non-existing server.

If I change the anonymous account to any active directory account it
then connects fine. Or if I specify bad credentials the error message
will be appropriate. Anyone have this issue before?

(Neither the default account or the active directory account have
permissions on the mssql server but am using a user name and password
authentication in the connection string.)