I have two different site (HQ & DRC), so it means I have 2 CAS Array, currently HQ are handling all the users mailbox. Let say one of the DB failover to site DRC, is the RPCClientAccessServer value change automatically according to it site ? example : DB01 on HQ site has mail.mydomain.com then it failover to DRC site, could it be DB01 RPCClientAccess value change to drc.mydomain.com ?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Krisna Ismayanto | My blogs: Krisna Ismayanto | Twitter: @ikrisna

In your e.g If the CAS servers are still available then it will contine to use those at HQ to access the DB at DRC. If they aren't availble and you have a site failure, then you need to update the DNS records to use DRC. However, if you have SP2 RU3 then you can control this behaviour in your e.g. Sukh Hi Sukh, I forgot to tell you last week I'm having weird experience because the value change by itself, so the user will prompt for auth again, so that's why I asking the scenario question.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Krisna Ismayanto | My blogs: Krisna Ismayanto | Twitter: @ikrisna

Are you running SP2 RU3, take a read through this was set bya user) or if you have AllowCrossSiteRPCClientAccess set to true or false. Sukh I'm running SP1 RU3v3Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Krisna Ismayanto | My blogs: Krisna Ismayanto | Twitter: @ikrisna

Then I suggest you go to SP2 RU3, apart from that the behaviour would be around the activation preference or if th endpoints are available or not.Sukh

Then I suggest you go to SP2 RU3, apart from that the behaviour would be around the activation preference or if th endpoints are available or not. Sukh I see. FYI, value for AllowCrossSiteRPCClientAcces on my environment has FALSE value, but still the FQDN for CAS Array change by itself :(Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Krisna Ismayanto | My blogs: Krisna Ismayanto | Twitter: @ikrisna

The value doesn't get changed if there's a switchover or a failover, unless an admin changes this value. Are you sure it was not changed?Sukh

The value doesn't get changed if there's a switchover or a failover, unless an admin changes this value. Are you sure it was not changed? Sukh Hi Sukh, Yes, when it failover to DR site, the value changed then I activate database again on HQ site but the RPC value didn't change because Activation Preference on the HQ is higher than DC, I've already repro it on lab :)Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Krisna Ismayanto | My blogs: Krisna Ismayanto | Twitter: @ikrisna