Env: 4 Exch 2010 Sp1 hosting mode MBXs, 2 CASHUBs, HLB infront.
This setup runs multiple domains for several different customers. The HLB can be reached at mail.ourhostingdomain.com and is where all the clients connect for anything (as this loadbalances the CAS-servers). When we run autodiscover tests against our own domain which differs form the hosting domain, the WEBSERVER of our primary domain replies with it's SSL certificate. This gives a faulty autodiscover, and warns the users that something is wrong.
I'm running tests with firstname.lastname@example.org, and it connects to the HLB as it should on mail.ourhostingdomain.com. Why would the webserver of ourprimarydomain.com reply instead of the exchange/hlb which got the correct certificate?
Ourprimarydomain.com got an _autodiscover SRV record to throw the requests to mail.ourhostingdomain.com (This seem to partially work, as we get connected to the correct server?)
If anyone could explain this behaviour, it would be much appreciated!
(No, there is no A or CNAME for autodiscover.ourprimarydomain.com, just the SRV)
The same thing happens for others on the same platform, and all of them got an SRV record that points to mail.ourhostingdomain.com.