I have a working setup with apache 2.2 server acting as a remote proxy.
I'm using proxytunnel with two chained proxies:
proxytunnel -q -X -p localproxy:8080 -r remoteproxy:443 -d destination:22
I had to apply a patch for SSL to work though: https://issues.apache.org/bugzilla/show_bug.cgi?id=29744
I'm now trying to do the same using the apache 2.4 server (SSL issue is resolved in 2.4 apparently). The connection establishes immediately but after cca 20 seconds apache (remoteproxy) resets the connection to the local proxy, thus killing my SSH session. Keepalives didn't help.
I tried raising the log level
LogLevel debug in the general apache config, but i'm not seeing any useful info.
Is there a way to debug the mod_proxy itself in a more detailed manner?