Oracle Enterprise Manager Database Control is not working properly

Hello!
I have a problem with Oracle Enterprise Manager Database Control, the web console. When I open the browser, instead of showing the login window, it shows the window where three arrows, the database instance, the listener, and the conection, that are red and down.
However they are working correctly, the database is up and working, but the EM doesn't show anything else.
Is there a way to make it work again?
Thanks!

The Enterprise Manager has lost sync with the database.
The only way I know to do this remotely is to tell the OEM to shut down and/or bring up the database - twice. It'll try and fail and perhaps eventually reset it's pointers.
I'd really like Oracle to create a 're-sync to actual state' URL ... there must be an easy way, such as flushing the collected metrics or something.

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