Hi!

Quick question! Lets say I set outlookanywhere to:

InternalClientAuthenticationMethod: NTLM

InternalHostname: mail.domain.com

ExternalClientAuthenticationMethod: Basic

ExternalHostname: webmail.domain.com

How does the client determine what url and auth to use? Is it just trying with internal first and if its a successful connection it continues to use it? Is it based on Active directory sites ?

Thanks!

Hi Samus,

all works by autodiscover.

Internally, Client locates a SCP that is in CAS server and receive the Autodiscover information

Externally, It cannot locate a SCP so It look for the following addresses..

https://<e-maildomain/autodiscover/autodiscover.xml
https://autodiscover.e-maildomain/autodiscover/autodiscover.xml

https://technet.microsoft.com/en-us/library/bb124251%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

Best regards.

Carlos

Sure it uses autodiscover to find the URLs for Outlook Anywhere, but how does it determine if it is internal or external?

If its able to use SCP, does it consider itself to be internal then? And using the internal URL?

Lets say the client is using VPN and can use SCP, will it use the internal URL then, even though the VPN site is note defined in active directory sites and service?

• Edited by Samus-Aran 4 hours 23 minutes ago

If you are connected by VPN so you have an Internal IP, so you can locate a DC , any CAS so the SCP too.

Well! Thats not my question! :)

My question is regarding how the client choose between the internal or external url that it gets from Autodiscover.

What you are saying, If a client can connect using the internal URL of OA, it will? Otherwise it will fail over to External url ?

• Edited by Samus-Aran 2 hours 43 minutes ago

Sure it uses autodiscover to find the URLs for Outlook Anywhere, but how does it determine if it is internal or external?

If its able to use SCP, does it consider itself to be internal then? And using the internal URL?

Lets say the client is using VPN and can use SCP, will it use the internal URL then, even though the VPN site is note defined in active directory sites and service?

• Edited by Samus-Aran Friday, June 19, 2015 3:05 AM

Sure it uses autodiscover to find the URLs for Outlook Anywhere, but how does it determine if it is internal or external?

If its able to use SCP, does it consider itself to be internal then? And using the internal URL?

Lets say the client is using VPN and can use SCP, will it use the internal URL then, even though the VPN site is note defined in active directory sites and service?

• Edited by Samus-Aran Friday, June 19, 2015 3:05 AM

Well! Thats not my question! :)

My question is regarding how the client choose between the internal or external url that it gets from Autodiscover.

What you are saying, If a client can connect using the internal URL of OA, it will? Otherwise it will fail over to External url ?

• Edited by Samus-Aran Friday, June 19, 2015 4:44 AM

Well! Thats not my question! :)

My question is regarding how the client choose between the internal or external url that it gets from Autodiscover.

What you are saying, If a client can connect using the internal URL of OA, it will? Otherwise it will fail over to External url ?

• Edited by Samus-Aran Friday, June 19, 2015 4:44 AM

should try internal first (SCP) and external later (DNS).

Maybe this link can help.

http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx

Regards.

should try internal first (SCP) and external later (DNS).

Maybe this link can help.

http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx

Regards.

Hi!

Quick question! Lets say I set outlookanywhere to:

InternalClientAuthenticationMethod: NTLM

InternalHostname: mail.domain.com

ExternalClientAuthenticationMethod: Basic

ExternalHostname: webmail.domain.com

How does the client determine what url and auth to use? Is it just trying with internal first and if its a successful connection it continues to use it? Is it based on Active directory sites ?

Thanks!

The client will connect to whatever autodiscover gives it - and how that works depends if the client is domain joined or not:

https://technet.microsoft.com/en-us/library/bb124251%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

In your specific Outlook Anywhere example above however, Outlook will attempt to connect the InternalHostname first. If it can resolve it ( even if the client is on the internet and not domain-joined), Outlook will use the internal hostname and auth. If it cant resolve the internal name, then it will attempt to access Exchange using the externalhostname and auth.

Hi!

Quick question! Lets say I set outlookanywhere to:

InternalClientAuthenticationMethod: NTLM

InternalHostname: mail.domain.com

ExternalClientAuthenticationMethod: Basic

ExternalHostname: webmail.domain.com

How does the client determine what url and auth to use? Is it just trying with internal first and if its a successful connection it continues to use it? Is it based on Active directory sites ?

Thanks!

The client will connect to whatever autodiscover gives it - and how that works depends if the client is domain joined or not:

https://technet.microsoft.com/en-us/library/bb124251%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

In your specific Outlook Anywhere example above however, Outlook will attempt to connect the InternalHostname first. If it can resolve it ( even if the client is on the internet and not domain-joined), Outlook will use the internal hostname and auth. If it cant resolve the internal name, then it will attempt to access Exchange using the externalhostname and auth.

Thanks!