Hello guys, if I will install OpenVPN behind a firewall what are the ports needed to allow VPN traffic?

Thanks.

Hello,

First google search result:

https://docs.openvpn.net/frequently-asked-questions/

Short answer: TCP 443, TCP 943, UDP 1194
Long answer: By default OpenVPN Access Server has 2 OpenVPN daemons running. One of them on UDP port 1194 and another on TCP 443. We recommend that you use the UDP port because this functions better for an OpenVPN tunnel. However, many public locations block all sorts of ports except very common ones like http, https, ftp, pop3, and so on. Therefore we also have TCP 443 as an option. TCP port 443 is the default port for https:// (SSL) traffic and so this is usually allowed through at the user's location.
TCP port 943 is the port where the web server interface is listening by default. You can either approach this directly using a URL like https://yourserverhostnamehere:943/ or by approaching it through the standard https:// port TCP 443, since the OpenVPN daemon will automatically internally route browser traffic to TCP 943 by default. (https://yourserverhostnamehere/).

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Thanks, buddy, I'll look into it.

Are there security gotchas need to watch out?