Openhab not Reachable from time to time

1

From Time to Time my openhab Version 5.1.1 is not reachable via Gui and App.

From the logs i dont see anything:


[12:21:04] root@openhabian:/home/openhabian# tail -f /var/log/openhab/openhab.log
java.lang.NullPointerException: null
2026-01-30 10:37:11.474 [WARN ] [ternal.handler.HomematicThingHandler] - Channel not found for datapoint '00111BE99286E5:0#ERROR_OVERLOAD'
2026-01-30 11:15:58.245 [WARN ] [ternal.handler.HomematicThingHandler] - Channel not found for datapoint '00111BE99286E5:0#ERROR_OVERLOAD'
2026-01-30 11:19:37.957 [WARN ] [ternal.handler.HomematicThingHandler] - Channel not found for datapoint '00111BE992873E:0#ERROR_OVERLOAD'
2026-01-30 11:27:22.925 [WARN ] [org.eclipse.jetty.server.HttpChannel] - /proxy
java.lang.NullPointerException: null
2026-01-30 11:27:22.925 [WARN ] [org.eclipse.jetty.server.HttpChannel] - /proxy
java.lang.NullPointerException: null
2026-01-30 11:56:10.530 [WARN ] [ternal.handler.HomematicThingHandler] - Channel not found for datapoint '00111BE99286E5:0#ERROR_OVERLOAD'
2026-01-30 12:01:28.739 [WARN ] [ternal.handler.HomematicThingHandler] - Channel not found for datapoint '00111BE992873E:0#ERROR_OVERLOAD'





^C


your code goes here[12:25:26] root@openhabian:/home/openhabian# /bin/systemctl status openhab.service
● openhab.service - openHAB - empowering the smart home
     Loaded: loaded (/lib/systemd/system/openhab.service; enabled; preset: enabled)
    Drop-In: /etc/systemd/system/openhab.service.d
             └─override.conf
     Active: active (running) since Mon 2026-01-26 15:47:09 CET; 3 days ago
       Docs: https://www.openhab.org/docs/
             https://community.openhab.org
   Main PID: 558 (java)
      Tasks: 684 (limit: 9368)
     Memory: 2.7G
        CPU: 19h 2min 43.727s
     CGroup: /system.slice/openhab.service
             ├─    558 /usr/bin/java -XX:-UsePerfData -Dopenhab.home=/usr/share/openhab -Dopenhab.conf=/etc/openhab -Dopenhab.runtime=/usr/share/ope>
             ├─ 513493 /usr/bin/ffmpeg -rtsp_transport tcp -hide_banner -i "rtsp://admin:XXXXX@192.168.101.215:554/user=admin&password=a7>
             ├─1005294 /usr/bin/ffmpeg -rtsp_transport tcp -threads 1 -skip_frame nokey -hide_banner -i rtsp://admin:%24l%40yer234%21@192.168.101.13>
             ├─1151960 /usr/bin/ffmpeg -rtsp_transport tcp -hide_banner -i "rtsp://admin:XXXXX@192.168.101.215:554/user=admin&password=a7>
             ├─1151961 /usr/bin/ffmpeg -rtsp_transport tcp -threads 1 -skip_frame nokey -hide_banner -i "rtsp://admin:XXXXX@192.168.101.2>
             └─1152707 /usr/bin/ffmpeg -rtsp_transport tcp -hide_banner -i rtsp://admin:xcxxcxcx@192.168.101.130:554 -q:v 5 -r 2 -vf scale=6>

The Serivce is running, and after few minutes Gui and APP are reachable again.

Can someone please help to finde the reason?

I have created an watchdog to check the gui via curl to get an Info when thiss happens, but everytime there are no Logs or etc.

Regards

Simon

2

Is your openHAB connected over WiFi and does the WiFi disconnect for short times? Or is openHAB not reachable from the system, where openHAB is running?

Does the item state change, if during openHAB is not reachable, you change a state of an item on localhost with curl:

curl -HContent-Type:text/plain -H POST http://localhost:8080/rest/items/your_item_name --data 51

3

no its on lan, the server is running and i am able to access via ssh.

I actually check “http://localhost:1080/rest” if this is reachable.

4

The default port is 8080, not 1080.

5

yes, u are right! it is working even it is not on default.

6

I’ve made some progress on this issue, but unfortunately I don’t have a solution yet. It seems to be related to the IPCAMERA Thing. By chance, I saw that the Thing was flapping and then the GUI was no longer accessible. I’ve now created a script that reacts to the flapping of the Things and then deactivates it, and since then I’ve had some peace and quiet.

Unfortunately, however, I can’t see anything in the debug logs from the ipcamera Thing that might explain why the GUI crashes.

7

I had some similar issues and have two potential things to check (both not related to your camera observations):

  1. From time to time my JVM crashes hard. I could never figure out why and just live with for now. Crash dumps can be found in “/var/lib/openhab”. The service restarts then resulting in a short downtime.
  2. My UniFi Intrusion Prevention System blocks my client IP for a few minutes when I delete things from the openHAB UI. I had to create an exception in my UniFi controller for my admin client to fix this.
8

Thanks for the hints, i have checked but nothing dumped here :slight_smile:

I also have unifi in place but only as wifi without any security, i also checked my fortigate but nothing dropped etc.

9

I think I’ve found the cause, at least I think so. A few weeks ago, I set up the RTSP stream from the camera to “RTSPHTTP_IP_Camera_MJPEG_URL” on my Synology because the idiots at Synology no longer checks RTSP in H264 for motion and the camera is now supposed to do it (mine can’t). So as soon as I disable Synology’s access to OH, the system runs stably. As soon as the stream is on, OH “breaks.” And now I really need someone who can take a closer look at this and possibly find a solution…