Exchange 2013 outlook anywhere (mapi over http) External asking password

Hi ,
We have set mapi over http :
internal Virtual directory : https://mailserver.domain.com/mapi
External Virtual directory : https://outlook.domain.com/mapi
Internal and extarnel authenthication : negotiate

When connecting from internal (lan) outlook 2013 will start and is sucsesfull connected.
When connecting from External outlook will ask for a password , once we fill in the password then it is connected sucsesfull.

But when a computer has joined the domain we want not to fill in a password.

What could be the trigger that i need to fill in the password?
ottenshxAsked:
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Tom CieslikConnect With a Mentor IT EngineerCommented:
OK,
1.  autodiscover.yourdomain.com must be listed inside your certificate
2. You must have A record in your external DNS: autodiscover.yourdomain.com and point it to your email server IP
3. You must create zone autodiscover.yourlocaldomain.com  in your local DNS with A host pointing to your internal email server IP
4. You must bind autodiscover.yourdomain.com to port 443 in your local IIS Manager
5. You must run PowerSchell command on your email server

Get-ClientAccessServer | Set-ClientAccessServer –AutoDiscoverServiceInternalUri https://autodiscover.company.com/autodiscover/autodiscover.xml

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Link must point to your email server autodiscover
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Tom CieslikIT EngineerCommented:
It's normal think.
It will always ask for password for connection to Exchange outside domain.
If you want prevent to do it you must install VPN and connect computer from outside network to your network using VPN prior to connect to Exchange.
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ottenshxAuthor Commented:
Hi Tom .

We have VPN connections in place and once connected to the VPN outlook will not ask for a password .
But when not connected to a VPN and the computer is a member of the domain it is asking for a password and with outlook anywhere ( RPC-HTTP this was not the case , outlook was using the logged on credentials to use for a outlook session without VPN.
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Tom CieslikIT EngineerCommented:
It looks like you have not configured correctly autodiscover.
I had same problem in my domain but after I've setup autodiscover correctly problem gone and Outlook is not asking for password without VPN anymore
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ottenshxAuthor Commented:
Hi Tom,

what did you configure to the autodiscover to make it work? then i will check the settings.
thanks.
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ottenshxAuthor Commented:
Thanks .
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