Help: 98: Address already in use

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Assuming the nginx configuration is fine, it looks like maybe nginx has lost track of its pidfile or something like that, causing it to try start two in parallel.

Somewhere to start could be:

  1. Make sure nginx is fully stopped. Verify that after stopping it the usual way (systemctl or service or whatever) you cannot access any of your websites and that there are no nginx processes running.
  2. Restart nginx and verify your sites are up.
  3. Try run Certbot.
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