NTS is not required since you are not using OS authentication. If you get rid of NTS entry - this should resolve 12631. Regards, Abhijeet -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Herbener, Martin - KETS Engineering and Management Sent: Wednesday, March 24, 2010 11:32 PM To: oracle-l@xxxxxxxxxxxxx Subject: NTS/NONE and ORA-12631 Hello, Some of my Windows XP, 10gR2-based clients find that when they configure their SQLNET.ORA like this SQLNET.AUTHENTICATION_SERVICES= (NTS,NONE) They get an ORA-12631 when they try to connect to a 10gR2 instance using a database userid, like this Sqlplus username@instance On other similarly configured desktops this works fine. Anyone seen this? Thanks! Martin -------------------------------------------- Martin Herbener 502 564 2020 ext 254 Office of Education Technology Kentucky Department of Education -- //www.freelists.org/webpage/oracle-l MASTEK LTD. Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List. In the US, we're called MAJESCOMASTEK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- //www.freelists.org/webpage/oracle-l