Cannot connect to Oracle Enterprise Manager Express

I downloaded image database Oracle Developer days 12 c virtualbox. I can start and access the desktop. When I try to log in to Enterprise Manager (EM) Express by using the URL http://127.0.0.1:8888 / em , ask me to install Adobe Flash. I set up and access the login screen.

I checked that I can connect with the SYSTEM and the SYS user in SQLPLUS.

When I try to log on as user SYS in EM Express I get a strange error: security token does not match. You have to login again...

enter image description here

The same happends if I login as user SYSTEM.

To me, it looks like for SYS credentials are OK, but there is something wrong with the user in the database. Is that correct and if so, how can I solve this? Or EM Express is simply no installation on the image?

Not able to connect to the database using Oracle EM Express database using firefox. "The security token does not match. You need to sign in again. "(Doc ID 1968763.1)

Tags: Enterprise Manager

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