This issue stops me.

After I login to OEM at http://oracleserver:5500/em using system as user
name and admin34 as password, I want to stop listener. SO I click Stop
button on Listener page. The page change to Net Services
Administration: Host Login. I input system as user name as admin34 as
password.

Well, I got Validation Error RemoteOperationException: ERROR: Wrong
password for user.

Is the password same password when I login into OEM as system? Thanks
in advanced,
-Hong