Hi! I have front-end / back-end Exchange 2003 installed on Windows 2003. I have the following server names in my network: Front-end Exchange: exchfe.mydomain.com Back-end Exchange: exchbe.mydomain.com Global Catalog/Domain Controller: w3kdc.mydomain.com I use for the RPC over HTTPS connection the common name owa.mydomain.com. I created also the certificate for this common name. This name points to front-end Exchange Server ip address. Also I defined host header owa.mydomain.com on IIS for my site. After many trobleshootings I can connect now successfully to Exchange using RPC over HTTPS . But the name resolution is strange if I connected to Exchange. I defined on client computer as Exchange server the name owa.mydomain.com. But after the client connected to Exchange, the name changes to exchbe.mydomain.com on the client machine. Why does this behaiviour occur? I don't want that the other external persons connect directly to my back-end Exchage. In this case back-end Exchange is not secure during RPC over HTTPS connection. Best Regards