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Has this worked before ? If yes, did you install some programs recently ?
Some antivirus programs, or network monitoring programs can make this happen, or any application using winsock. If you have such software installed, try uninstalling it.
If this is not the case, try changing the authentication service to NONE in the sqlnet.ora file:
SQLNET.AUTHENTICATION_SERVICES= (NONE)
Last Answered:
May 19 2009 11:56 PM GMT by Carlosdl 
29855 pts.