Is there an easy way to configure Forms Authentication to be passed to the farm servers, the idea is to have the authentication happen at one server and another server will be access with those credentials, our application uses forms authentication, and when we hit another server directly on the farm...

We install Microsoft Application Request Routing on a server and we are using it as a reverse proxy server. All the url rewrite rules work, if we update the rule set with new rules everything still works but if we introduce or modify any rule that contains any IP condition and use REMOTE_ADDR as a variable...