The user is able to log into his database with his current user name and password. Occasionally, upon logging into his database using the same user name and password he will receive an error ORA-01017: invalid username/password; logon denied. If the user re-boots the machine the error disappears.
SOLUTION:
Go to your SQLNET.Ora File
Locate the Parameter "SQLNET.AUTHENTICATION_SERVICES="
If this parameter is set to NTS, you may encounter these issues. To resolve this matter comment out this setting.
Please consult your system administrator before performing any changes to your environment.
