I looked into it, and there was an error on my Tapatalk dashboard when I logged in to check. Apparently Tapatalk does some connection checks every now and then to see if the server is up, and it failed because the command they are using doesn't support TLS (or at least, it forces SSLv3). The problem is, I disabled SSLv3 on the server because it's considered insecure.
I've started a thread in their support forum; hopefully they will be able to fix the issue.
I've started a thread in their support forum; hopefully they will be able to fix the issue.