![]() These methods include making sure SSL is installed, forcing HTTPS, and clearing the browser’s cache and SSL state.Ī green check mark indicates the website’s SSL is installed and active. Since it is difficult to pinpoint what causes the error, we will explain three typical steps to fix ERR_SSL_PROTOCOL_ERROR for both site owners and visitors. 3 Efficient Steps to Fix ERR_SSL_PROTOCOL_ERROR ![]() Similarly, not forcing HTTPS on an SSL-certified website may cause the same issue. For instance, this error may appear when forcing HTTPS without a valid SSL certificate installed. On the website’s end, a misconfigured SSL is a common reason. Use website checker tools to verify whether the website is down for everyone else or just you. If none of the solutions above work, the problem should be with the website. Temporarily turning off firewall or antivirus.Disabling an outdated or problematic browser extension. ![]() When encountering ERR_SSL_PROTOCOL_ERROR as a visitor, try: It is also possible that the Windows Defender Firewall or an antivirus program is blocking the secure connection. It may be caused by an error on the website or the visitor’s end.įor visitors, old browser extensions, outdated SSL caches, or the QUIC protocol may be the culprit. The cause of this error is difficult to discern. ![]()
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