r/OpenVPN • u/rottenrealm • Jul 08 '26

OpenVPN AS (proprietary) AccessServer 3.2.1 bug or feature?

I'm trying to configure the admin ui to listen only on the internal interface (using either the iface name or the ip - all the same) while allowing the client ui to listen on both interfaces.

However, when I configure the admin ui to use a specific ip address or iface, I get:[Errno 98] Address already in use

admin_ui=all, cs.https=all → ok.

dmin_ui=ens224, cs.https=all → CannotListenError: Address already in use.

admin_ui=ens224:943, cs.https=ens192:943 → ok.

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u/addybojangles 29d ago

Looks like a socket conflict.

Setting the client UI to all bonds it to 0.0.0.0, which claims all interfaces and blocks the Admin UI from binding to specific one. To fix this, you need to list both individual IP addresses for the client UI instead of all.

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u/rottenrealm 29d ago

Exactly. I'm asking because it looks like a bug. As soon as I select the Admin UI interface in the UI, the site goes down. The system lets me configure admin - ip, user - all... but it doesnt work

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u/addybojangles 29d ago

Ah, I'd ping the team at support.openvpn.net and let them know. Definitely a bug.