Fix ERR_SSL_PROTOCOL_ERROR
                     How to Fix 
ERR_SSL_PROTOCOL_ERROR? 
This error can occur when there is an issue with the SSL/TLS connection 
between the user’s browser and the web server. While it is difficult to 
determine the exact cause of this error, in this post we will explore the 
common causes and provide solutions on how to fix it.
What does the ERR_SSL_PROTOCOL_ERROR mean?
ERR_SSL_PROTOCOL_ERROR means there is a common SSL/TLS-related 
issue that occurs when the browser is unable to establish an SSL-
protected Website. When this error occurs, you may see a message like 
“This site can’t provide a secure connection” or 
“ERR_SSL_PROTOCOL_ERROR” in their browser.
ERR_SSL_PROTOCOL_ERROR message on Different 
Browsers
Google Chrome
In Google Chrome, you will find this error as “ERR_SSL_PROTOCOL_ERROR” with a 
statement saying the domain sent an invalid response.
Mozilla Firefox
In Mozilla Firefox, err_ssl_protocol_error will be shown as a 
warning message as a failed secured connection.
Microsoft Edge
In Microsoft Edge, you will see a simple error message stating ” Can’t 
connect securely to this page”.
Why Does the ERR_SSL_PROTOCOL_ERROR Occur?
There can be several reasons why the ERR_SSL_PROTOCOL_ERROR may occur, 
some of them are:
Outdated SSL Certificate
Incompatible SSL/TLS Protocol Version
Misconfigured SSL/TLS Settings
Antivirus or Firewall Interference
Web Server Issues