Named Pipe Connection through ASP - HELP!

We have a problem with interfacing a dll which is called through an Active Server Page. Our network infrastructure uses Named Pipes on Windows 2000 with SQL Server 2000 IIS version 5.0 and MDAC 2.5.

When the ASP calls the dll which (should) insert a new record into a SQL table via a stored procedure call (wrapped as a COM object), we receive the following error:

80004005 SQL Server does not exist or access denied error.

We have tried running this from the Server Admin account, but makes no difference. If we use TCP/IP the mechanism works fine, unfortunately this is not a route we can utilse without significant overall network security implications.

Any advice much appreciated!As you probably know, that's a generic error code. It could be network problems (firewall etc), file permissions or location, or any number of other things. This link shows some of the possible causes (http://support.microsoft.com/support/kb/articles/Q169/3/77.ASP?LN=EN-US&SD=gn&FR=0&qry=80004005&rnk=1&src=DHCS_MSPSS_gn_SRCH&SPR=SQL).