Can´t start OpenThread Border Router add-on

Third party integrations
1

I have Nabu_Casa_SkyConnect_v1 install on * Home Assistant OS * 2025.9.4
But OTBR will not start…
(I have test USB SkyConnect on other test HASS, and is working.)

Have done fresh install of SkyConnect and fw with thread.
I have addon “UniFi Network Application” and Dezonz as well.
I have test different port as 9080&9081

Help, what is the problem
Logg say

-----------------------------------------------------------
 Add-on: OpenThread Border Router
 OpenThread Border Router add-on
-----------------------------------------------------------
 Add-on version: 2.13.0
 You are running the latest version of this add-on.
 System: Home Assistant OS 16.2  (amd64 / generic-x86-64)
 Home Assistant Core: 2025.9.4
 Home Assistant Supervisor: 2025.09.0
-----------------------------------------------------------
 Please, share the above information when looking for help
 or support in, e.g., GitHub, forums or the Discord chat.
-----------------------------------------------------------
s6-rc: info: service banner successfully started
s6-rc: info: service universal-silabs-flasher: starting
[19:11:54] INFO: Flashing firmware is disabled
s6-rc: info: service universal-silabs-flasher successfully started
s6-rc: info: service otbr-agent: starting
[19:11:55] INFO: Setup OTBR firewall...
[19:11:55] WARNING: Custom OpenThread REST API port is not supported. Using 8081.
[19:11:55] INFO: Starting otbr-agent...
[NOTE]-AGENT---: Running 0.3.0-b067e5ac-dirty
[NOTE]-AGENT---: Thread version: 1.3.0
[NOTE]-AGENT---: Thread interface: wpan0
[NOTE]-AGENT---: Radio URL: spinel+hdlc+uart:///dev/ttyUSB0?uart-baudrate=460800&uart-flow-control
[NOTE]-AGENT---: Radio URL: trel://enp3s0
[NOTE]-ILS-----: Infra link selected: enp3s0
49d.17:12:15.296 [C] P-SpinelDrive-: Software reset co-processor successfully
00:00:00.033 [N] RoutingManager: BR ULA prefix: fd23:6f:9534::/48 (loaded)
00:00:00.033 [N] RoutingManager: Local on-link prefix: fdde:ad00:beef:cafe::/64
[ERR ]-REST----: InitializeListenFd error bind : Address already in use
[EMERG]-REST----: FAILED /usr/src/ot-br-posix/src/rest/rest_web_server.cpp:173 - otbr rest server init error
[19:11:55] WARNING: otbr-agent exited with code 255 (by signal 0).
Chain OTBR_FORWARD_INGRESS (0 references)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere             PKTTYPE = unicast
DROP       all  --  anywhere             anywhere             match-set otbr-ingress-deny-src src
ACCEPT     all  --  anywhere             anywhere             match-set otbr-ingress-allow-dst dst
DROP       all  --  anywhere             anywhere             PKTTYPE = unicast
ACCEPT     all  --  anywhere             anywhere            
otbr-ingress-deny-src
otbr-ingress-deny-src-swap
otbr-ingress-allow-dst
otbr-ingress-allow-dst-swap
Chain OTBR_FORWARD_EGRESS (0 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            
[19:11:55] INFO: OTBR firewall teardown completed.
s6-svlisten1: fatal: /run/s6-rc/servicedirs/otbr-agent failed permanently or its supervisor died
s6-rc: warning: unable to start service otbr-agent: command exited 1
s6-rc: info: service legacy-cont-init: stopping
s6-rc: info: service universal-silabs-flasher: stopping
s6-rc: info: service mdns: stopping
/run/s6/basedir/scripts/rc.init: warning: s6-rc failed to properly bring all the services up! Check your logs (in /run/uncaught-logs/current if you have in-container logging) for more information.
/run/s6/basedir/scripts/rc.init: fatal: stopping the container.
Default: mDNSResponder (Engineering Build) (Jan 14 2025 21:04:03) stopping
s6-rc: info: service universal-silabs-flasher successfully stopped
s6-rc: info: service banner: stopping
s6-rc: info: service banner successfully stopped
s6-rc: info: service legacy-cont-init successfully stopped
s6-rc: info: service fix-attrs: stopping
s6-rc: info: service fix-attrs successfully stopped
s6-rc: info: service s6rc-oneshot-runner: stopping
s6-rc: info: service s6rc-oneshot-runner successfully stopped
[19:11:55] INFO: mDNS ended with exit code 4 (signal 0)...
s6-rc: info: service mdns successfully stopped
2

Maybe show the configuration, above seems the cause.

3

That is only a warning and
I have test different port as 9080&9081

IMG_0741
IMG_07411170×2532 203 KB

IMG_0742
IMG_07421170×2532 176 KB

4

I have test to stop addon deconz
Then is possible to start OpenThread Border Router✅
But i have change port, or is not possibel to change port on OpenThread Border Router

5

I’m kinda working from memory, but I think the port config is used only to enable the OTBR’s Webserver port 8080, not so much to change the port number. Anyway according to the WARNING

it is using 8081 anyway, so I guess changing the port number is not actually supported.

6

Yes. I guess that is the problem.
I docker is possibel to set the port with env
OTBR_REST_PORT: 8081
OTBR_WEB_PORT: 8080

But not sure how to do that in addon.
Or is not possibel to. run deconz & openthread parallel??

7

For what its worth…
what I think is happening is that HA is setting up a run script for the AddOn to run an otbr-agent (which handles the API) and there appears to be a parameter setting called --rest-listen-port for the otbr-agent that can set the port to a different value (take a look here). But HA is not making use of this parameter from the AddOn’s run script and as the error shows, it only uses 8081. My only recommendation is to post an issue to the AddOn’s GitHub and see what the developer’s say, but I see you already have done this… so maybe include this parameter and run script to the issue and see what they say.