[Zope] ZOracle problems

[Alexandre A. Drummond Barroso]

I've installed DCOracle in a Zope instance running with
PCGI + Apache variation; Zope process is running with the same user the web server is running; DCOracle test was fine (I also
created a small Python app to access a test database); The .so files were copied to the right place.
But when I try to connect to the database (or create a connection and test it in the same operation) it gives an Apache error:
"Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request."...

Verifying the error_log file, this is what I've found:
 PCGI Error: [503 Service Unavailable] ((116) unable to connect, fd=4) Success

What could be happening?

Thanks for any help.

Alexandre.