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Slack app for Jira Server stopped working on Dec 3rd


Connection is broken and when re-entering credentials we see:

  • H2_PRIOR_KNOWLEDGE cannot be used with HTTPS

This is the same day an update was released:

  • Reliability: upgrade third-party HTTP client dependency


2 answers

1 accepted

2 votes
Answer accepted

As per marketplace version listing at

Version 2.0.21 • Released 2021-12-06 • Supported By Atlassian • Free • Atlassian Closed-Source

Version 2.0.20 was mistakenly released with an option that forces a specific HTTP protocol when calling Slack that effectively breaks communications. This version removes such option.


Updating of an add-on should solve your problem.

Thanks for the reply!  Have updated to the fixed version.

1 vote

Same issue with Slack Server App

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