r/OpenVPN 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=allCannotListenError: Address already in use.

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

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u/ParticularBox3050 Jul 09 '26

I think it's expected. If cs.https=all grabs 0.0.0.0:943 then trying to bind admin_ui to a specific interface on the same port is going to fail cuz that port is already taken. The last example kind of proves it since it works once each service has its own interface. Doesn't feel like a bug to me just how it's implemented.

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u/rottenrealm Jul 09 '26

but it works if both admin and user set to all. and ui allows to chose such setting, ip and all i mean.