hi there,
However, now I'd like to configure OpenVPN so that it does not tunnel the already-open HTTP ports through the VPN connection, since those work just fine directly through the proxy. How would I go about setting this up?
you want something that is called policy based routing....
if your client is linux then using iptables to mark packages and iproute
to route them accordingly...
f.e
http://www.policyrouting.org/PolicyRoutingBook/ONLINE/TOC.html
Michael.