Hello! We received the following email from Let’s Encrypt.
**Action is required to prevent your Let's Encrypt certificate renewals from breaking.** Your Let’s Encrypt client used ACME TLS-SNI-01 domain validation to issue a certificate in the past 60 days. TLS-SNI-01 validation is reaching end-of-life and will stop working on **February 13th, 2019.** You need to update your ACME client to use an alternative validation method (HTTP-01, DNS-01 or TLS-ALPN-01) before this date or your certificate renewals will break and existing certificates will start to expire.
We are using CentOS 6/apache/Linode_VPS/single domain running on VPS and manually edited the vhost file.
Can you help us in updating our ACME client. We are using following command to renew certificates:
Below command gives me certbot: command not found