Common Causes of Failure in Acme.sh Application for Let's Encrypt Certificate under Linux

Web Technologies
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Common Causes of Failure in Acme.sh Application for Let’s Encrypt Certificate under Linux

As a webmaster, I have recently encountered a common issue with many of my peers using the Acme.sh application to obtain a Let’s Encrypt certificate under the LNMP environment on Linux. In this article, I will discuss the most common causes of failure and provide solutions to help you overcome these challenges.

From Certbot to Acme.sh: A Shift in Recommendation

With the release of LNMP 1.5, the Certbot application was replaced by Acme.sh as the recommended tool for online management of Let’s Encrypt certificates. While Certbot was initially recommended by Let’s Encrypt, Acme.sh has proven to be a more perfect and efficient solution. Its online application management and maintenance of the green certificate are incredibly simple and efficient, and the most significant advantage is that Acme.sh is almost independent of the server system environment.

Common Causes of Failure

After using Acme.sh to manage Let’s Encrypt certificates for a while, I have identified two common causes of failure:

  1. Invalid Domain Error: This error occurs when the Acme.sh script is unable to resolve the domain name through the DNS service. This is often the case when using a cloud DNS service, such as CloudXNS. To resolve this issue, you need to add the IP address of the host DNS resolution API to the whitelist. This is because the Acme.sh script uses the API to request a certificate, and if the IP address is not whitelisted, it will result in an “invalid domain” error. If you are using multiple cloud hosts with the same DNS resolution service, you need to add the public IP of each host to the whitelist.
  2. Script Upgrade and Update Issues: Sometimes, the Acme.sh script may not be up-to-date, which can cause issues with certificate renewal. It is essential to ensure that the Acme.sh script is currently using the latest version. You can update the script by checking the official GitHub repository or searching for the latest version on Baidu or Google.

Resolving the Issues

To resolve these common causes of failure, follow these steps:

  1. Add IP Address to Whitelist: If you are using a cloud DNS service, add the IP address of the host DNS resolution API to the whitelist.
  2. Update Acme.sh Script: Ensure that the Acme.sh script is currently using the latest version. You can update the script by checking the official GitHub repository or searching for the latest version on Baidu or Google.

By following these steps, you should be able to successfully apply for an SSL certificate from Let’s Encrypt using the Acme.sh application under the LNMP environment on Linux.

Additional Tips

If you are experiencing issues with alternative cloud hosting or cloud host operating systems, you may want to refer to the official GitHub repository or post a detailed log on the LNMP forum for help.

Conclusion

In conclusion, the Acme.sh application is a powerful tool for obtaining a Let’s Encrypt certificate under the LNMP environment on Linux. However, it is essential to be aware of the common causes of failure and take steps to resolve them. By following the steps outlined in this article, you should be able to successfully obtain an SSL certificate from Let’s Encrypt using the Acme.sh application.