I think I have read much of those before yes it is RPC and i have open 80/443 ports but the problem is more about the web page which is on the apache server and also that the proxy is not HTTP-RPC (or maybe it could be but I don't know how to configure iptables to work like that)
I am not sure what you saying exactly but I think you are looking for RPC over HTTP configuration.
For you firewall you will only need to open 80/443 ports. The server address you have to key in is for the RPC use after passing the HTTP-RPC proxy.
Here, read all this before you start anything.
I need little help with my situation I have running exchange 2003 on internal server connecting to the Internet through linux firewall. With no problem I can access web interface (by https://.../exchange in browser) and there is a need to be able access it directly from outlook. problem is setup iptables on the firewall to be able access it. Also I'm not shure about configuration in outlook where is asking for server address because there cannot be address like I mentioned before but only direct lover level domain without anything after highiest lever domain identifier (means cannot be like https:// ... .org/ exchange/)
thnks a lot for help