is the tnsnames entry correct - also you don't mention version ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Syed Jaffar Hussain Sent: Sat 06/03/2004 13:57 To: oracle-l@xxxxxxxxxxxxx Subject: 12506: TNS adaptar protocol error Hi list, One of my client wants connect to our win2k DB server, he is getting TNS adapotr protocol error. Their OS is Win 2003 and our OS is win2k. What surprising me is, we have unix OS and they are able to connect to it without any trouble. But, when they try to connect to windows server, they are getting this error. Rgds Jaffar