[GH-ISSUE #4979] Keycloak IDP backend broken due to unnormalised URL #10483

New Issue

saavagebueno · 2026-08-05T01:26:05-04:00

saavagebueno commented

2026-08-05 01:26:05 -04:00

Originally created by @st4rburn on GitHub (Dec 20, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/4979

Describe the problem

Keycloak as of 26.4.3 now requires admin API request paths to be normalised, which the NetBird management server doesn't do in at least the request to https://<host>/admin/realms/<realm>//users/count?. Removing the double slash in this and similar requests should resolve this issue. This prevents authentication to the dashboard and VPN

To Reproduce

Steps to reproduce the behavior:

Set up NetBird with Keycloak as the auth backend (Keycloak version 26.4.3 or higher)
Attempt to log in to the dashboard as an administrator
This will fail, check the management server logs
See 400 error from Keycloak caused by unnormalised URL in request from NetBird management server

Similar also happens when attempting to connect to the VPN from the client.

Expected behavior

Authentication succeeds and the dashboard is useable

Are you using NetBird Cloud? No

NetBird version: 0.60.8

Is any other VPN software installed? No (and irrelevant for this issue)

Screenshots

Additional context

Add any other context about the problem here.

Have you tried these troubleshooting steps?

~~Reviewed client troubleshooting (if applicable)~~ (irrelevant)
Checked for newer NetBird versions
Searched for similar issues on GitHub (including closed ones)
Restarted the NetBird client
~~Disabled other VPN software~~ (irrelevant)
~~Checked firewall settings~~ (irrelevant)

Originally created by @st4rburn on GitHub (Dec 20, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/4979 **Describe the problem** Keycloak as of [26.4.3](https://www.keycloak.org/docs/latest/upgrading/index.html) now requires admin API request paths to be normalised, which the NetBird management server doesn't do in at least the request to `https://<host>/admin/realms/<realm>//users/count?`. Removing the double slash in this and similar requests should resolve this issue. This prevents authentication to the dashboard and VPN **To Reproduce** Steps to reproduce the behavior: 1. Set up NetBird with Keycloak as the auth backend (Keycloak version 26.4.3 or higher) 2. Attempt to log in to the dashboard as an administrator 3. This will fail, check the management server logs 4. See 400 error from Keycloak caused by unnormalised URL in request from NetBird management server Similar also happens when attempting to connect to the VPN from the client. **Expected behavior** Authentication succeeds and the dashboard is useable **Are you using NetBird Cloud?** No **NetBird version:** 0.60.8 **Is any other VPN software installed?** No (and irrelevant for this issue) **Screenshots** <img width="1781" height="129" alt="Image" src="https://github.com/user-attachments/assets/14a6d4ec-7bc6-4141-8e5a-aa765aa298f2" /> <img width="764" height="71" alt="Image" src="https://github.com/user-attachments/assets/cc1c18cd-1490-480a-8cfd-b57616103272" /> <img width="583" height="60" alt="Image" src="https://github.com/user-attachments/assets/b648c0ee-d725-40e3-8407-63a8949fcd79" /> <img width="938" height="93" alt="Image" src="https://github.com/user-attachments/assets/d765844c-f28d-4925-839c-87ae23dbf217" /> **Additional context** Add any other context about the problem here. **Have you tried these troubleshooting steps?** - [ ] ~~Reviewed [client troubleshooting](https://docs.netbird.io/how-to/troubleshooting-client) (if applicable)~~ (irrelevant) - [x] Checked for newer NetBird versions - [x] Searched for similar issues on GitHub (including closed ones) - [x] Restarted the NetBird client - [ ] ~~Disabled other VPN software~~ (irrelevant) - [ ] ~~Checked firewall settings~~ (irrelevant)

saavagebueno added the triage-needed label 2026-08-05 01:26:05 -04:00

saavagebueno commented

2026-08-05 01:26:05 -04:00

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saavagebueno commented

2026-08-05 01:26:05 -04:00

@st4rburn commented on GitHub (Dec 20, 2025):

For anyone experiencing this issue, Keycloak's fix for apps that haven't adjusted how they make requests is essentially start with the argument --http-accept-non-normalized-paths=true and enabling debug logs for org.keycloak.quarkus.runtime.services.RejectNonNormalizedPathFilter to see what apps are causing the issue.

More info here: https://www.keycloak.org/docs/latest/upgrading/index.html#migrating-to-26-4-3

This is deprecated though and will be removed, it's just for while apps adjust their code to do normalisation themselves.

@st4rburn commented on GitHub (Dec 20, 2025): For anyone experiencing this issue, Keycloak's fix for apps that haven't adjusted how they make requests is essentially start with the argument `--http-accept-non-normalized-paths=true` and enabling debug logs for `org.keycloak.quarkus.runtime.services.RejectNonNormalizedPathFilter` to see what apps are causing the issue. More info here: https://www.keycloak.org/docs/latest/upgrading/index.html#migrating-to-26-4-3 This is deprecated though and will be removed, it's just for while apps adjust their code to do normalisation themselves.

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Reference: DYNR/netbird#10483