We have recently deployed a front end\back end exchange 2003 SP2 system. Email works fine, OWA works fine. I have followed MS KB articles to set up RPC over HTTPS and have not had any luck. I have also searched a million tech articles to no avail. I can reach my server via https://servername.domain.com/rpc and /rpcproxy.dll. I beleive the problem is the communication from FE to BE. I have tried to use rpcdump with no success. We have a Thawte certificate, so I do not beleive that that is the problem. I accidentally set rpc ports manually the FE, BE and DC's. If I deselect this is a front end server, restart and re-enable it, will that reset the ports in the registry? Also, can I do the same for the back end server? How else can I test this configuration?