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OpenVPN port-share Slows HTTPS 100x

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Kevin K

Regular Contributor
When I use OpenVPN's port-share to enable OpenVPN server and an HTTPS web server to share port 443, traffic to my HTTPS web server is 100x slower. Is this just a fact with port-share or can I improve that?

I'm running Merlin 384.7_2 on a RT-AC68U. Only my external port 443 is allowed to be exposed to the internet (policy). External traffic uses 443 for both OpenVPN and access to my web server. My HTTPS traffic gets forwarded to my web server due to the config line "port-share 192.168.1.10 443".

As an experiment, I temporarily set up an external port 444 to forward to 192.168.1.10:443 too.

When I loaded an sample file via https://external-name:443 (which went via the OpenVPN port share), it took 20 seconds to download. By comparison, using https://external-name:444 took 0.2 seconds.

At the instant I did my testing, there were no active OpenVPN clients. It sure looks like port-share slows my HTTPS traffix by 100x. Is there a way around this?
 

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