[Zope] ZOracleDA woes - cannot connect

Please help!!! I am trying to connect to Oracle server. Running Zope 2.1.4, ZServer alone (for now), Debian frozen(potato). I have stable ZOracleDA 2.1.0. After a lot of work, I succeeded to compile the DCOracle package, and I am able to connect with the Python script DCOracle_test.py, which is included. I am only able to connect when I am a user 'oracle'. But when I try to connect from Zope, the connection never happens,and Zope returns "Document contained no data. Contact your network administrator". Sometimes, Zope dies. I am really desperate by now, as I try to make connection for three days now. I searched all FAQs on Zope site, nothing found. Any idea what I am doing wrong? Thanks, Michal Bukovjan