[SSL] Add incomplete certificate chain as a cause of error 526#29154
Merged
RebeccaTamachiro merged 3 commits intocloudflare:productionfrom Mar 20, 2026
Merged
[SSL] Add incomplete certificate chain as a cause of error 526#29154RebeccaTamachiro merged 3 commits intocloudflare:productionfrom
RebeccaTamachiro merged 3 commits intocloudflare:productionfrom
Conversation
Contributor
|
LGTM! 👍 |
RebeccaTamachiro
approved these changes
Mar 20, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Adds "incomplete certificate chain" as a named cause of error 526. The existing list covered expired certificates, self-signed certificates, and hostname mismatches, but omitted the case where the origin server is not serving the required intermediate CA certificate(s). This prevents Cloudflare from building a trusted chain to a root CA under Full (Strict) mode and is a common real-world cause of 526 errors.
support case:
02030823Documentation checklist