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docs: add FAQ entry for port-share feature (#1435)

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## Summary
- Adds FAQ entry explaining how to use OpenVPN's `port-share` feature to
run OpenVPN on port 443 alongside a web server

Closes #453
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Stanislas
2025-12-18 12:34:45 +01:00
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FAQ.md
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@@ -183,3 +183,21 @@ label fc00::/7 1
```
This will not work properly unless you add you your VPN server `server.conf` one or two lines to push at least 1 (one) IPv6 DNS server. Most providers have IPv6 servers as well, add two more lines of `push "dhcp-option DNS <IPv6>"`
---
**Q:** How can I run OpenVPN on port 443 alongside a web server?
**A:** Use OpenVPN's `port-share` feature to multiplex both services on the same port. When OpenVPN receives non-VPN traffic, it forwards it to your web server.
1. During installation, select **TCP** and port **443**
2. Configure your web server to listen on a different port (e.g., 8443)
3. Add to `/etc/openvpn/server/server.conf`:
```
port-share 127.0.0.1 8443
```
4. Restart OpenVPN: `systemctl restart openvpn-server@server`
This is useful when your network only allows outbound connections on port 443. Note that TCP has worse performance than UDP for VPN traffic due to head-of-line blocking, so only use this when necessary.