SCEP Server unreachable

SCEP Server unreachable

Hello

We have configured everything according to the guide, we had also ME Support who helped us.
But the Tablet cannot get the certificate, when we assign the profile to the tablet we get an error on the Profiles page of the device: mdm.agent.payload.scep.certificate.scep_server_unreachable 



The server is reachable through the Browser and also the mscep and mscep admin pages are reachable through the browser.
Does someone have a clue where the problem could be?
We tried via Wifi and also LAN(Internal) connection, same problem.

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