SEPM may lock an account after multiple failed attempts. Wait for the lockout period to expire (usually 15-30 minutes) before trying again.
: In the dialog box, type the user name for the account you need to reset. For domain administrators, include the domain name. For local accounts, leave the domain field blank. symantec endpoint protection manager reset admin password
: Type your username and click Temporary Password . An email will be sent with a reset link. SEPM may lock an account after multiple failed attempts
This procedure only works for the default "admin" username. If you created a custom administrator username and forgot it, you must log in with another administrator account to reset it, or reinstall the management server. symantec endpoint protection manager reset admin password
: C:\Program Files\Symantec\Symantec Endpoint Protection Manager\Tools .