When the ERR_SSL_PROTOCOL_ERROR error occurs in Chrome, you can follow the following steps to resolve it: 1. Check whether the system time and automatic settings are turned on; 2. Clear the browser cache and cookies; 3. Temporarily turn off the antivirus software or firewall; 4. Windows users reset the TCP/IP and Winsock settings; 5. Update or reinstall the Chrome browser. In most cases, this error is caused by local configuration problems. Troubleshooting in turn can restore normal access.
The ERR_SSL_PROTOCOL_ERROR error occurs in Chrome, which usually means that the browser cannot establish a secure connection to the website. This problem may be with your network settings, browser configuration, or the website itself. Below are some common causes and corresponding solutions to help you quickly troubleshoot problems.

1. Check whether the system time and time zone are correct
SSL certificates rely on accurate system time. If your computer is incorrect, especially much earlier or later than the current time, it will cause SSL protocol verification to fail.

You can check this way:
- Windows: Click on the time in the lower right corner of the taskbar and select "Adjust date/time" to ensure that "Auto Set Time" is turned on.
- Mac: Go to "System Settings → Date and Time" and confirm that "Automatically set date and time" is enabled.
If the time is manually modified, even if it is only a few minutes of deviation, this error may be triggered.

2. Clear browser cache and cookies
Sometimes Chrome's local cache data is corrupted, which can also cause SSL connection exceptions.
The operation steps are as follows:
- Open Chrome Settings → Privacy and Security → Clear browsing data
- Select "Past Hour" or "All Times" in the time range
- Check "Cookies and other website data", "Cached pictures and files"
- Click "Clear Data"
After clearing, restart the browser and try to visit the target website again.
3. Try turning off antivirus software or firewall
Some third-party antivirus software (such as Kaspersky, Bitdefender) or firewalls intercept HTTPS requests and forcefully check encrypted traffic, thus breaking the SSL handshake process.
You can try:
- Temporarily turn off antivirus software or firewall
- If you have a security plug-in similar to "HTTPS Intercept" function, it will also be disabled
Note: Please be careful when closing the security software, and only temporarily use it during the test phase.
4. Reset TCP/IP and Winsock settings (Windows only)
If none of the above methods are useful, it may be a problem with the network protocol stack. You can reset the relevant settings through the command prompt.
Specific operations:
- Open Command Prompt as Administrator (CMD)
- Enter the following command in turn and press Enter:
netsh winsock reset netsh int ip reset
- Restart the computer after completion
This step is more effective in fixing underlying network problems and is suitable for some system-level SSL/TLS failures.
5. Update or reinstall Chrome browser
Although not common, a corruption of the browser itself can also lead to SSL errors. Update to the latest version of Chrome can resolve potential compatibility issues.
Operation suggestions:
- Open Chrome Settings → About Google Chrome to see if there are any updates
- If there is already a latest version, you can try uninstalling and reinstalling
ERR_SSL_PROTOCOL_ERROR Although it looks scary, it is not a problem with the website in most cases, but a glitch in your local environment. Follow the above steps step by step and you can basically solve it.
The above is the detailed content of How to fix ERR_SSL_PROTOCOL_ERROR in Chrome. For more information, please follow other related articles on the PHP Chinese website!

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