Accessing Exchange 2013 from FortiClient

Hello,

We've just installed Microsoft Exchange 2013 on our server, and we also have FortiGate.

When I enter Outlook through FortiClient it doesn't recognize the Exchange server and I know why-

When you enter the server's IP address on the page attached (don't mind the language - it's Hebrew).

It jumps to the server's NAME not IP which the connection through the FortiClient does not recognize (only the IP).

I was told that on previous versions of Exchange you could leave an IP address of the server and it wouldn't jump to the server's name, thus, enabling the FortiClient to access Outlook. So it's an Exchange 2013 problem.

Just to clarify, I can connect to the server's shared files and everything through it's IP address - so the only problem is with the servers name.

Please HELP :)

Thank you in advance!!!