Activate SSL on port 33443 instead of 443

Please fill out the fields below so we can help you better.

My domain is:

I ran this command:certbot --apache

It produced this output: Failed to connect to for tls-sni-01 challenge

My operating system is (include version):ubuntu 16.04

My web server is (include version):

My hosting provider, if applicable, is:

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):yes


the ACME specification defines the TLS-SNI challenge will only work on port 443 so you need to ensure your environment conforms to this


is there an other solution instead of TLS-SNI ?

Yes, there’s the HTTP-01 challenge, which requires a connection on port 80, and the DNS-01 challenge, which requires making modifications to your DNS records.

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