Let’s Encrypt is a free certification authority that provides free X.509 certificated for TLS encryption. An automated process enables to facilitate the creation, verification, setup, and renewal of SSL certificates for protected websites.
Let’s Encrypt provides a number of limits:
More information about additional limits can be found https://letsencrypt.org/docs/rate-limits/ .
This module is available in ISPmanager 5.131 and later.
In order to install a plug-in as root, navigate to Integration → Modules.
After you have installed Let’s Encrypt in ISPmanager, you can obtain a self-updated SSL-certificate for your domain. Be sure to create a user with the configured web-domain and valid domain name available to world-wide DNS.
Once the installation is completed, in the WWW → SSL-certificates module the user will see two new buttons — Let's Encrypt and Let’s Encrypt Log. Clicking the first button will start the process of the certificate issue.
The second function will be activated, if you already have the Let's Encrypt certificate in the list of SSL-certificates, and will redirect you to the Event log.
Before generating a certificate make sure that the Let's Encrypt function is enabled:
There are two ways to obtain a Let's Encrypt certificate:
Every day at 1:30 a.m the system checks what certificates should be updated. The update procedure starts 7 (or fewer) days before the certificate expiration date.
You can also start the update process manually with the letsencrypt.check.update function. Call the function via the mgrctl utility with the following parameters:
/usr/local/mgr5/sbin/mgrctl -m ispmgr letsencrypt.check.update force_update=yes cert_name=%cert name% user_name=%user name%
Attention! The number of certificates that can be issued for a domain is limited, that's why do not update your certificates manually too often.
When updating a certificate with DNS-verification, new TXT-records will be generated. If the external DNS-server is used, the records won't be added automatically, and the certificate won't be updated.
First, a self-signed certificate with the specified parameters is created, then, once a minute, an attempt is made to obtain a certificate. You can set the maximum number of certificate requests that the control panel will send simultaneously. To do this, change the LetsencryptProcessCount parameter in the ISPmanager configuration file. The default value for this parameter is 1.
If errors occur, they are logged. Retrying to receive is performed every minute. Requests for new certificates take precedence over retrying old ones.
You can start the letsencrypt.periodic command via the mgrctl utility.
If the certificate cannot be obtained within 24 hours, the corresponding notification will be created for the user and administrators. No more attempts will be made.
If the certificate is issued successfully, the self-signed certificate is changed into Let's Encrypt. The user and administrators receive the notification that the certificate has been issued.
Order of requests:
Let's Encrypt supports DNS-based validation that requires specific TXT records to be inserted into the DNS zone for a domain. Select the DNS validation checkbox when you order a new SSL-certificate.
TXT-records will be automatically added in Domains → Domain names → Records.
If domain validation processes cannot be completed successfully for 24 hours since you ordered a certificate, the system will stop trying to issue the certificate.
Let's Encrypt can be issued for mail domains. Navigate to Mail domains → click "Add" or "Edit" → select New Let's Encrypt. The certificate will be also issued for aliases mail.domain.name, smtp.domain.name, pop.domain.name. If the web-domain with the same name is not created in the control panel, the verification procedure will run via DNS.
Starting from version 5.147.0 ISPmanager supports wildcard SSL certificates. To receive a Wildcard SSL-certificate check the Wildcard box on the order form.
The log file is located in /usr/local/mgr5/var/letsencrypt.log.
The default logging level is not enough to receive all the information an administrator may need to solve possible issues. Complete the following steps: