Ubuntu 24.04 Kernel 6.8.0-110 Regression Affecting Cloudron
-
What's happening?
A kernel regression in Ubuntu 24.04 (
6.8.0-110-generic) is causing networking issues on Cloudron systems.
This regression breaks internal connectivity (hairpin NAT / loopback routing), which can result in symptoms such as:- Apps being unreachable from within the Cloudron server itself
- Failure to pull images from a Docker registry hosted on the same Cloudron instance
cloudron-support --troubleshootreporting:Hairpin NAT is not working- Docker registry errors like
registry error: {"reason":"server error","statusCode":500}
This kernel version is typically deployed automatically via Ubuntu's unattended upgrades after a reboot, you may not have chosen to install it.
Note: This issue affects Cloudron systems running Ubuntu 24.04 (Noble) only.
Users on Ubuntu 22.04 are not affected.
Step 1: Check if you are affected
Run the following command on your Cloudron server:
uname -rIf the output contains
6.8.0-110-generic, your system is affected.Example affected output:
6.8.0-110-generic #110-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 19 15:09:20 UTC 2026
Step 2: Fix: Update to Cloudron 9.1.7
The recommended fix is to update Cloudron to version
9.1.7, which includes a patch for the firewall rules affected by this kernel regression.Update via the Cloudron Dashboard:
Dashboard → Settings → Updates → Update Cloudron
Background
This is caused by a known kernel regression tracked under Debian Bug #1130336.
The regression affects the networking stack in a way that breaks hairpin NAT, preventing a server from reaching its own services through its public IP or domain name.The underlying fix has been committed to Cloudron's platform:
https://git.cloudron.io/platform/box/-/commit/bffc97ab2fedb06100bc507abd0f8b42d343ea6e
References
Forum topics:
- https://forum.cloudron.io/topic/15419/issue-pulling-custom-app-from-registry-on-the-same-cloudron
- https://forum.cloudron.io/topic/15417/cloudron-down-after-ubuntu-docker-update-docker-service-fails-to-start
- https://forum.cloudron.io/topic/15314/could-not-load-dashboard-website-with-loopback-check-after-3-tries
Debian Bug Report:
If you continue to experience issues after updating, please create a topic in the Cloudron forum and reference this announcement
-
J james referenced this topic
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login