run the resetpass.bat from the tools folder of SEPM
Open Windows Explorer on the computer where you run Symantec Endpoint Protection Manager.
2. Change directory to the <Drive>:\Program Files\Symantec\Symantec Endpoint Protection Manager\Tools folder.
3. Double-click the Resetpass.bat executable file. The password is reset to the default password.
4. Be sure to change the password immediately.
log in with user name: admin
password:admin
it will ask you to change..