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Learn more about how SSL certifications are verified here.
What to do if you have a self-signed certificate:
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Migrate to a public certificate - we recommend Let's Encrypt if you want a free option. Here is a tutorial on how to get it set up with Jira.
Connect without SSL - we DO NOT recommend connecting this way for production instances, but in some cases, sandbox or pre-production instances can be connected without SSL.
Explore our enterprise option to self-host our software.