Hello Guys
I have a problem in logging in as internal

When i try to login as internal either in sqlplus or svrmgrl it shows invalid user/password but with others cooly its logging to the system (sys,system,scott ect...)

Also one more thing I noticed is that when I try to connect with

sys as sysdba/password its showing the same error message
invalid user/password

Guys help me in this

Thanks
BJ