Portainer is not working with Cloudflare tunnel

[dominicste]

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Hi everyone,

I'm experiencing an issue with Portainer after an update of portainer.
Portainer is running in Docker and im accessing it via Traefik and want to use Cloudflare Tunnel for external access. (yes i know its not recommended)
All my other services works fine through cloudflare tunnels.

This works:
When I access Portainer locally through my local domain via Traefik, everything works perfectly. No errors, all pages load correctly.

This not:
As soon as I access Portainer through my Cloudflare domain via Cloudflare Tunnel, I get multiple errors. Only the "Hosts" page loads, all other sections fail to load any data.

I get errors such as:
Could not retrieve licence info
Could not retrieve stacks
and much much on the sidebar..

The UI loads partially, but most data is missing.

The setup worked flawlessly for several months. I already tried completely recreating the Portainer container.
As soon as I use the Cloudflare Tunnel, the same errors appear again.

Has anyone experienced similar issues with Cloudflare Tunnel after the latest update?
Is there anything that changed that might cause this behavior?

Any help would be greatly appreciated.

Edit:
Now i found out, that if i reloading the page about 10 times it works for a few minutes. Then it stops working and shows the errors again. I really dont know why.

[Nick-Portainer]

I wonder if Traefik is killing the connection, any logs there? I currently have a Portainer instance behind Cloudflare via Nginix Proxy Manager and this has worked for a year + at this stage without issues.

[dominicste]

Hi Nick,

it was running fine for about one and a half years. Now it just will not work properly. I encountered some issues with traefik over cloudflare tunnels too. (I enabled traefiks Dashboard and got error „Error fetching data“ at the same time I got error messages on portainer)
Since i already planned to switch to pangolin on my vps, i did it this the last few days and now it’s running just fine again. I dont know what Cloudflare has changed on it’s System, but there is something that changed.

It runs with the same setup and traefik instance on my local network without tunnels. The traefik logs doesnt show any relevant error or Info messages.

So if you got any issues about not loading data, there is a possibility that this results from Cloudflare tunnels.