Developer 6i INSALLATION PROBLEM

hi. I have have first installed oracle 9i and then forms 6i on window XP. all installation is fine. But when i try to connect to database from forms. It give me error **ORA-12571: TNS:packet writer failure.** I don't know why it is so. few days ago i installed and it installed well. why it is creating problem now.
Please help me i have to develop an application for my business.
Please do it at your as soon as possible. i am too much worried about it...
Best Regards

hi
http://www.orafaq.com/forum/t/38297/2/
or
Another thing you can try is to change your SQLNET.ORA file to have the following line:
SQLNET.AUTHENTICATION_SERVICES = (NONE)
If its Correct/Helpful please mark it thanks
sarah

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