Cannot input username and password of the SEP Manager

Hi,

   After migrating SEP 12.1 RTM to SEP 12.1 RU2, the upgrade was successful. SEPM is up and the clients are reporting. The this is we cannot login to the SEPM, I mean we cannot input username and password to the SEPM thats why we cannot access the SEPM. Please help. Thanks. ^___^