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I'm very sorry for the lack of information. I just don't know it. The webmaster we used has just disappeared. Literally. Our login in to our own site has expired as well so we are just stuck. Our SSL certificate has expired so any visitors get the security issue warning. I am NOT a web designer. I am just the lucky one tasked with trying to get our site up and running. Is there a way for me to update our SSL certificate without having access to the server and all the information above? I'm so sorry for this very basic request. I hope someone can be kind enough to let me know if there is a simple fix or if we are just screwed. Thanks all.
It looks like your site is hosted on AWS in an EC2 container. Is your account with AWS directly? Because it is essential you get access to your account so you can pay their bills if nothing else.
Not really unless you are buying a service that manages your site for you on AWS. Let's Encrypt certs require software (an ACME Client) to request the certs. Usually this Client runs on your server and automatically refreshes the cert every 60 days.
Your cert expired last Oct29 2023 so has been broken for some time
If you can get SSH access to your EC2 instance we can probably find the ACME Client you were using and maybe even guide you to fixing it.