Exchange 2013 doesn´t allow mobil phones to connect (iphone and android)


we have an Exchange 2013. If we try to connect from outside to our server (IP or url), it says on androids that the connection couldn´t be established and the iphone accepts it. But if i want to look into the mails at the iphone, it says, that no connection was possible to the server.
OWA over browser is going fine. The Ports that are fowarded are 80,443 and 25. The users have the right (checked in Exhchange admin center) to use "Owa for devices" and "ActiveSync"

Any idea what to check/enable/modify ?

Thanks for helping.
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Scott CSenior EngineerCommented:
What if any MDM are you using?  Also check load balancers to make sure aren't blocking anything.

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IT GuyNetwork EngineerCommented:
Has Exchange 2013 ever allowed mobile phone to connect?
loosainAuthor Commented:
We have no load balancers. Only one Server 2012. It was installed before i was starting the job at this company.
As i was told it never allowed mobile phones.

I just used "test-activeSyncConnectivity" in Exchange shell to test. The result is "error". As error it says "". I don´t know how to read more of this error description. But it seems to be the way to the problem...
loosainAuthor Commented:
It was a problem of rights. We had to take away admin rights and then to inherit the rights in AD under advanced settings...
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