Auth error when renewing certificate on Plesk

My domain is:,
I ran this command: Tried to renew certificate through Plesk

It produced this output:
Error: Could not issue a Let’s Encrypt SSL/TLS certificate for Authorization for the domain failed.
Invalid response from
Type: urn:acme:error:connection
Status: 400
Detail: Fetching Connection refused

My web server is (include version): I don’t know.

The operating system my web server runs on is (include version):CentOS Linux 7.4.1708 (Core)‬

My hosting provider, if applicable, is: 1and1

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): Plesk Onyx 17.5.3 Update #44

This domain is not reachable at all, via IPv4 and IPv6:

$ host has address has IPv6 address 2607:f1c0:84d:5a00::3f:8350

$ telnet 80
telnet: Unable to connect to remote host: Connection refused

$ telnet 2607:f1c0:84d:5a00::3f:8350 80
Trying 2607:f1c0:84d:5a00::3f:8350...
telnet: Unable to connect to remote host: Connection refused

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