The user can log in to his database using his current username and password. Occasionally, upon logging into his database using the same username and password, he will receive the error ORA-01017: invalid username/password; logon denied. If the user reboots 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.
