Hi I'm trying to deploy a CAS solution to meet the following requirement: * Load balance two active/active sites. * If a user from Site A is directed to Site B CAS, then an automatic redirection (without user intervention) should take place. The second requirement is the more important one as natively within Exchange a redirection does take place, but it requires a click from the user that directs them to the CAS server at their own site. What have others done with similar requirements? Is there a way to automatically redirect without the extra OWA page with the link to the correct CAS server? Thanks.

Hi The Sites, are they at same IP segment? Same AD Site? Stretched network? Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Different AD sites and subnets.

CAS array and define on mailbox level rpc CAS array. Users are by default redirected to closest CAS server that home user mailbox database. More in your question is how user access OWA site, which define the way CAS proxy will work for you and your design. NLB can not be spanned ower two AD sites.

MaliStane is correct For setting the RPC value on databases, check the following link http://technet.microsoft.com/en-us/library/bb123971.aspx Set-MailboxDatabase -id DBxx -RpcClientAccessServer FQDNOFCASARRAY Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi, You should leave the external url of the Site B as blank, and set the internal url. Then the proxy mechanism will work for your scenario. It will give you the seamless working. Thanks Allen Allen Song