Action required: Let's Encrypt certificate renewals


Hi there

I’ve received an email stating that letsencrypt will only be supporting TLS-ALPN-01. I have a web currently on SSL with certbot. How do I do I check whether my certbot is using TLS-ALPN-01 and if not how do make it?

And if Certbot do not support TLS-ALPN-01, is there any other alternative to get this to work?



Certbot doesn’t support TLS-ALPN validation.

Recent versions of Certbot use HTTP validation instead of TLS-SNI validation.

Certbot also supports DNS validation.

Unless you’re completely unable to use port 80, it should be easy to upgrade Certbot and automatically use HTTP validation.

If using TLS-ALPN validation is your only option, you would have to look into other ACME clients.

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g., so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on 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):

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):


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