Hi @CITI Support ,
welcome to the Atlassian community!
Please could you specify what happen at client side? Are u using a reverse proxy behind your Jira? Did u import the new certificate into the jdk cacert?
Please take a look to the following article https://confluence.atlassian.com/adminjiraserver/running-jira-applications-over-ssl-or-https-938847764.html
Hope this helps,
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