Renewal over port 443

Hi,

in the instructions, it says that a cronjob is placed automatically for renewing the certificate, once it is outdated.
Does renewal take place over port 443 (HTTPS) or port 80 (HTTP)?
I configured my Apache2 web server so that only traffic over port 443 is allowed. Do I have to open port 80 for renewal of the certificate?

If you've used the http-01 challenge (probably), then yes, port 80 needs to be open.

Please read:

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@Osiris thanks for the quick reply, I will reconfigure my web server so that HTTP requests are automatically handed over to port 443/HTTPS.

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"Handed over to" via a 301 redirect, right? (Not TCP port forwarding.)

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