OWA 2010 SSO with Redirection

Hello Everyone,

We have a portal access configuration for OWA 2010 and have configured a Forms-Based SSO object to associate with it. SSO works well if the mailbox is in the same AD site as the OWA connection however, if the mailbox resides in our DR site, Exchange redirects the browser to a server in the DR site which changes the URL thus breaking SSO. I'm thinking there has to be a way to handle this redirect and still pass SSO successfully but we've yet to find a way around this. Has anyone else come across such an implementation hurdle? Any suggestions? This is my first post on Dev Central so please let me know of any info needed to review. :)

Thank you in advance!

Luis