Resolution:
Yes, RTserver supports making connections through a proxy server, with or without authorization requirement.

In order to configure RTserver to use a proxy server you must set the conn_names option to listen via the proxy server using the following syntax:
     proxy:node:address@protocol:dest_node:dest_address

And then in order for other RTprocesses (RTservers or RTclients) to connect via the proxy server they must use the same syntax:
    proxy:node:address@protocol:dest_node:dest_address
When defining their server_names option.

If authentication is required then two additional options, Proxy_Username and Proxy_Password must also be set using strings that specify the username and password that the RTprocess (RTclient, RTserver, or RTmon) provides to the proxy server for
authentication. These options are only needed if your RTprocess is going to attempt to connect to a proxy server.

Does rtserver support connecting another rtserver through a proxy server which requires log in?