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diff --git a/doc/user/clusters/agent/troubleshooting.md b/doc/user/clusters/agent/troubleshooting.md index eddc6ef3e16..c01b1337aca 100644 --- a/doc/user/clusters/agent/troubleshooting.md +++ b/doc/user/clusters/agent/troubleshooting.md @@ -239,3 +239,23 @@ Error: parse error at (gitlab-agent/templates/observability-secret.yaml:1): uncl ``` This error is typically caused by an incompatible version of Helm. To resolve the issue, ensure that you are using a version of Helm [compatible with your version of Kubernetes](index.md#supported-kubernetes-versions-for-gitlab-features). + +## `GitLab Agent Server: Unauthorized` error on Dashboard for Kubernetes + +An error like `GitLab Agent Server: Unauthorized. Trace ID: <...>` +on the [Dashboard for Kubernetes](../../../ci/environments/kubernetes_dashboard.md) page +might be caused by one of the following: + +- The `user_access` entry in the agent configuration file doesn't exist or is wrong. + To resolve, see [Grant users Kubernetes access](user_access.md). +- There are multiple [`_gitlab_kas` cookies](../../../administration/clusters/kas.md#kubernetes-api-proxy-cookie) + in the browser and sent to KAS. The most likely cause is multiple GitLab instances hosted + on the same site. + + For example, `gitlab.com` set a `_gitlab_kas` cookie targeted for `kas.gitlab.com`, + but the cookie is also sent to `kas.staging.gitlab.com`, which causes the error on `staging.gitlab.com`. + + To temporarily resolve, delete the `_gitlab_kas` cookie for `gitlab.com` from the browser cookie store. + [Issue 418998](https://gitlab.com/gitlab-org/gitlab/-/issues/418998) proposes a fix for this known issue. +- GitLab and KAS run on different sites. For example, GitLab on `gitlab.example.com` and KAS on `kas.example.com`. + GitLab does not support this use case. For details, see [issue 416436](https://gitlab.com/gitlab-org/gitlab/-/issues/416436). |