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Difference between revisions of "HowTo:Use CA-signed Certificates in Offline Networks"

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[[Category:How-To|Use CA-signed Certificates in Offline Networks]]
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[[Category:Web service|Use CA-signed Certificates in Offline Networks]]

Latest revision as of 15:37, 13 November 2025

To enable secure communication on offline internal networks, you can use officially signed certificates. This requires a verifiable public domain and Split DNS configuration.


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Instructions

Acquire a Public Domain and Minimal Hosting

  • Register a public domain through a trusted registrar.
  • Set up minimal hosting (e.g., a simple web page) so the domain is publicly accessible for validation.

Request a Certificate from a CA

  • Use the hosting environment to complete domain validation with a Certificate Authority (CA).
  • You can use free services like Let's Encrypt to obtain an SSL/TLS certificate for your domain.

Install the Certificate

  • Install the acquired certificate on your internal server to enable encrypted communication.

Configure Internal DNS

  • Set up a local DNS server for your intranet.
  • Create DNS records for the official domain pointing to your internal server’s IP address.
  • This ensures intranet clients reach the internal server using the official certificate.

Important Notes

  • Internal DNS servers must never be exposed to the internet.
  • Protect the certificate password and private key to prevent man-in-the-middle attacks.
  • Use certificates with limited lifespans and renew them regularly.
  • A public DNS record is required for external CA validation.


See also

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