also a welcome to the Atlassian community.
First of all, you need to get a new certificate, probably from the same source you got it last time. If you don't know where that is or want to switch, I can recommend Let's Encrypt.
If you have your certificate, it really depends on the setup you have for your Confluence Server/Data Center.
Hope that helps,
Hi @rckonda ,
welcome to the Atlassian community!
You need to install new certificate on the jdk server side using the following guide https://confluence.atlassian.com/conf59/running-confluence-over-ssl-or-https-792499769.html
Hope this helps,
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