Openvpn port conflict att modem router w/Bgw320 open port with slate

I'm kind of set up my open VPN server. The wire guard server already works and so does openvpn on other ports.

My issue is when I try to do TCP 443 port I get a conflict port error.

I'm not sure if it's my ISP doing this, modem router issue, or I'm doing something wrong with the GLI in that router.

Seems like I have a few options and I'm not sure where to begin. I can do port forwarding, DHCP fixed with IP pass through and not sure what else.

Thank you so much

Some things to keep in mind on my modem router that's connected to the internet directly has Wi-Fi enabled and must keep Wi-Fi enabled in addition to the Wi-Fi of the GLI net server router

When I check on GRC.com. it shows that Port 443 is open

The 443 port uses HTTPS accessible in in GL GUI. But it only for LAN access under the GL router, so it can not conflict the WAN, please check your network devices.

OpenVPN is not required the port 443.
The default port of the OpenVPN is 1194, or others port number also work ok.

Thanks. I understand but I am trying to use ports which are often not blocked when travelling. That's why I was thinking of using 443 for OpenVPN but my concern is if I do that what https port can I put for LAN? Thanks

You can use other ports for https e.g. 444

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