[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied

[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied
Server : W2K
Workstations : XP, W2K
Web apllication locks up with 8-12 users on this error
We can unlock everything with IISRESET
Server machine has all SQL SP and latest MDAC version

[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied

[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or
access denied
Server : W2K
Workstations : XP, W2K
Web apllication locks up with 8-12 users on this error
We can unlock everything with IISRESETServer machine has all SQL SP and latest MDAC version