This hotfix addresses a couple of problems in Application Request Routing Version 2.5. 1) In Reverse Proxying/SSL Bridging scenarios for outgoing SSL connection ARR does not validate that the subject name of the SSL certificate returned by the destination server matches the host name used in the rewritten request. . 2) ARR Client Affinity does not work if ARR endpoint is listening on non standard port (other than 80 or 443). More details information about this hotfix is in the Microsoft Knowledge Base article, 2693489.