Hello piersk!
I get the same error on our production machine. (NT4SP6a;IIS4;MSSQL7;PHP4.2.3)
The really weird thing is: It works on our test server (I used the identical archive).
The only difference I see is a different Library with the SQL Server Client Network Utility:
TEST: DBNETLIB.DLL (8.0.194 - works)
PRODUCTION: DBMSSOCN.DLL (7.0.819 - fails)
Does this matter? What can I try...
Thanks
Niels