I'm not sure how TOR gets its addresses but sometimes you need to specify it directly, especially for bridges for some reason. Just use your whole IP

ORPort 123.456.789.123:80

Dont forget if you are mapping Obfs4 you need to add the permissions so obfs can go to a port that low

Don't forget to change the ORPort, ServerTransportListenAddr, ContactInfo, and Nickname options.

• If you decide to use a fixed obfs4 port smaller than 1024 (for example 80 or 443), you will need to give obfs4 CAP_NET_BIND_SERVICE capabilities to bind the port with a non-root user:

  sudo setcap cap_net_bind_service=+ep /usr/bin/obfs4proxy

  To work around systemd hardening, you will also need to set NoNewPrivileges=no in /lib/systemd/system/tor@default.service and /lib/systemd/system/tor@.service and then run systemctl daemon-reload. For more details, see ticket 18356.

• Note that both Tor's OR port and its obfs4 port must be reachable. If your bridge is behind a firewall or NAT, make sure to open both ports. You can use our reachability test to see if your obfs4 port is reachable from the Internet.

Hello:

Am trying to configure my bridge according to instructions on Tor site.  Using Ubuntu.  No matter what port I pick for the ORPort I keep getting this error:

Unable to find IPv4 address for ORPort 80. You might want to specify IPv4Only to it or set an explicit address or set Address.

Have never seen this before.  Please help.

Thanks

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