2 Site Exchange 2010 CAS Array - Active/Active with GTM
My first post so go easy on me.
I have a conundrum I can't get my head around and would appreciate any thoughts/advice
Simple put we have 2 BIGIP's with GTM. 1 in each of our DataCentres in the US and Europe.
These DataCentres for Exchange 2010 are Active/Active. So we have users accessing their mailboxes in the US DataCentre, and users accessing their mailboxes in the Europe DataCentre
Both DataCentres are Internet Facing.
so when a user browses to our Exchange 2010 OWA URL they get directed to either the US DataCentre or Europe DataCentre based on where they are geographically located. Most of the time this is fine.
However, if they travel abroad (say a user goes from Europe to USA) and then browses to the Exchange 2010 OWA site, they will get OWA Forms Based Page in the US, but their mailbox is homed in Europe
Now, before you say it, this would be fine, because we can use CAS-CAS Proxying. HOWEVER, we need the Forms Based (fancy White/Yellow) logon page available wherever a user goes. If we switch it off to just Integrated Windows Auth, yes we can have CAS-CAS Proxying, but the user doesnt get the FBA Logon page.
when they go back to Europe, and then logon to OWA, they will get the Europe OWA page and as their mailbox is homed in Europe they logon fine.
1. We dont have the WebAccelerator Option on our BIGIP's
2. Yes, we are SSL Offloading OWA/ECP etc.
3. Our GTM directs the user based on their Geographic Source IP.
4. We need the user to access their mailbox via the pretty FBA logon screen whether they hit the CAS servers in the US DataCentre, or the CAS Servers in the Europe Datacentre, regardless of where their actual mailbox is.
I have enabled Integrated Windows Auth in IIS (instead of in the EMC) which leaves FBA enabled, but it didnt work (yes, I removed the External URL and set it to $null
We must have both DataCentres Internet Facing for OWA. If we just have one, yes, problem solved as we can use CAS-CAS Proxy, but that isnt an option unfortunately.
Hope you can help