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.