TNS-12560 error when running as Windows Service

Question

Hello,
I created a VB.NET application that connects to a Oracle database using DbProviderFactory and ODP.NET for .Net Framework 2.0. This application runs on XP, I need it to run as Windows Service, but every time it try to connect to the database throw the Oracle exception TNS-12560: TNS:protocol adapter error, the weird thing is the same application running as a Console Application it works (Same code, same connection string, same query). It was using ODP.NET 10 I updated the provider to 11 still got the same error. The service is running user Local System account, and it has the same problem running under other adm account.
Following is error in the sqlnet.log (PS: The file was under the system32 folder, probably because was running as a service):
Fatal NI connect error 12560, connecting to:
+(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=XX.XX.XX.XX)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XXX)(CID=(PROGRAM=C:\Program Files\MyApp\MyApp.exe)(HOST=MYCOMPUTER)(USER=MYUSER))))+
VERSION INFORMATION:
+     TNS for 32-bit Windows: Version 10.2.0.1.0 - Production+
+     Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 10.2.0.1.0 - Production+
Time: 28-AUG-2009 02:20:19
Tracing not turned on.
Tns error struct:
ns main err code: 12560
TNS-12560: TNS:protocol adapter error
ns secondary err code: 0
nt main err code: 530
TNS-00530: Protocol adapter error
nt secondary err code: 56
nt OS err code: 0
Does anyone have any thoughts as to why I'm getting this error ??
Thanks

Answer 1

I don't know :^(
There could be many reasons: differences in the environment, missing permissions, virus scanners, you name it.
Is it running under the same user as on the console?
I suspect that the error code will give a hint where the problem is, but I could not find any documentation what this code means.
You could try to run an Orace Net trace - maybe you get an idea if you see where in the connection process the problem occurs.
Yours,
Laurenz Albe