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What is the difference between Intranet SSL and Private SSL ?
Intranet SSL and Private SSL generally refer to the same type of SSL/TLS certificate used to secure internal servers, web applications, intranets, development environments, private cloud services, and systems that are not publicly accessible on the Internet.
The term Intranet SSL emphasizes the certificate's use within an organization's internal network, while Private SSL emphasizes that the certificate is issued by a private, non-public Certificate Authority (CA) rather than a publicly trusted CA.
SecureNT Intranet SSL Certificates are a Private SSL solution that provides trusted TLS encryption for internal servers, web applications, IP addresses, and enterprise networks. Certificates are issued through a private, non-public CA, making them ideal for environments where public SSL certificates cannot be used or are not required.
In practice, the terms Intranet SSL and Private SSL are often used interchangeably when referring to SSL/TLS certificates designed for internal use.
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Let's Encrypt vs Private CA for Internal Websites ?
The fundamental difference is who establishes trust.
Let's Encrypt is a publicly trusted Certificate Authority. Devices generally trust its certificates without the organization installing an internal CA.
A Private CA is controlled by the organization. Authorized devices are configured to trust the organization's CA.
For internal websites, both can provide HTTPS encryption and server authentication.
| Let's Encrypt | Private CA | |
|---|---|---|
| Public trust | Yes | No |
| Internal hostnames | Limited | Yes |
| Private IP addresses | Subject to current IP-certificate rules | Yes |
| CT visibility | Public certificates are logged | No public CT requirement |
| Internet dependency | Yes for public issuance/validation | Can operate internally |
| Trust control | Public CA ecosystem | Organization controlled |
Let's Encrypt can be a practical choice when automatic public trust and existing public-domain infrastructure are important.
A Private CA can be appropriate when an organization wants controlled trust, internal naming, private IP certificates or greater independence from public infrastructure.
In short: Neither is universally better. The appropriate choice depends on whether the application needs public Web PKI trust or controlled organizational trust.
Related: Can I Use Let's Encrypt for Internal Websites?
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