---
title: Why appears "Certificate Error" in some blocked websites?
slug: legacy/why-appears-certificate-error-in-some-blocked-websites
description: Learn how to resolve HTTPS access issues for blocked websites. This guide explains why your browser displays a certificate warning, indicating the site's certificate is not from a trusted authority.
docTags: 
createdAt: 2024-08-05T08:50:49.651Z
---

That message appears since you are trying to open a blocked website, using a *HTTPS* secure connection.
So the Browser informs you that the certificate has not been realeased by a reliable/recognized authority.

It's possible to avoid this error by installing our *Certification Authority* on your internal devices.
Here below the guide:
[CA installation guide](docId\:rRQJomCg4HRtohsE7oa5j) 

Alternately, in most cases, you can click *Proceed anyway* to force the site to open.
In this case you will see the Filter blocked page. 

**Other ways to ask**:

- Why Do Blocked Websites Show a Certificate Error?
- What Causes SSL Certificate Errors on Restricted Sites?