Case1: Only one user is unable to login
User account has been locked.
Case2: No one is able to login.
Password of PS user was locked or changed. If it was locked, unlock it from the back end.
UPDATE PSOPRDEFN SET ACCTLOCK=0 WHERE OPRID='PS';
If the password is changed, change the password from back end and change it in application server and process scheduler server and bounce them.
