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