How to Fix ERR_SSL_PROTOCOL_ERROR
Find out how to fix ERR_SSL_PROTOCOL_ERROR in this easy-to-follow tutorial. Start your online journey with Hostinger web hosting 👉 https://bit.ly/3TPdGhv
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ERR_SSL_PROTOCOL_ERROR is a connection error that prevents you from accessing a website because the web browser can’t verify the SSL certificate. With our video tutorial, you can easily troubleshoot the error using various methods.
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Troubleshooting ERR_SSL_PROTOCOL_ERROR:
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🕒 Timestamps
00:00 - Intro
00:09 - What Causes the Error
01:11 - Reset the System Time
02:20 - Clear Browsing Cache
02:48 - Flush the DNS Cache
04:20 - Clear SSL State
06:02 - Temporarily Disable Antivirus
06:31 - Delete the Hosts File
07:11 - Disable or Enable VPN
07:43 - Enable QUIC Protocol
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ERR_SSL_PROTOCOL_ERROR occurs because the web browser can’t verify a website’s SSL certificate. Therefore, this error message appears, warning users that the site is not secure.
This error might be caused by an issue with the website server or your device. To troubleshoot ERR_SSL_PROTOCOL_ERROR, try the following methods:
📌 Reset the System Time – Windows
Some SSL certificates rely on local system time for verification. Fix your computer time and date manually or by syncing it.
📌 Clear Browsing Cookies and Cache – Google Chrome
Deleting browsing cookies and cache might solve the error. After clearing the browsing data, revisit the site to check if the issue persists.
📌 Flush the DNS Cache
Your system might store corrupted or outdated DNS cache records. Solve it by using flush DNS command. The command for Windows is the same across all OS versions, but macOS requires different command for different versions.
Here are the specific commands for each of macOS versions:
👉 macOS 11 Big Sur or 12 Monterey:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
👉 macOS 10.11 El Capitan, 10.12 Sierra, 10.13 High Sierra, 10.14 Mojave, or 10.15 Catalina:
sudo killall -HUP mDNSResponder
👉 macOS 10.10 Yosemite:
sudo discoveryutil udnsflushcaches
👉 macOS 10.7 Lion, 10.8 Mountain Lion, or 10.9 Mavericks:
sudo killall -HUP mDNSResponder
👉 macOS 10.6 Snow Leopard:
sudo dscacheutil -flushcache
👉 macOS 10.5 Leopard:
sudo lookupd -flushcache
📌 Clear SSL State – Windows
On Windows, go to Control Panel → Network and internet → Internet Options. Inside the Internet Properties window, click on the Clear SSL state button under the Content tab.
📌 Delete SSL Certificate – macOS
On macOS, go to Utilities → Applications → Keychain Access. Then, select the SSL certificate you want to remove. Remember to proceed with caution.
📌 Temporarily Disable Antivirus
Several antivirus programs might interfere with SSL connections, so temporarily disabling your antivirus might fix the error.
📌 Modify the Hosts File – Windows
Your Hosts file is in C:\windows\system32\drivers\etc. Open it using Notepad, and add IP addresses followed by the corresponding domain names at the bottom line of the file.
📌 Disable or Enable VPN
Using a VPN may solve the SSL connection error. However, in several cases, disabling it can also fix the error.
📌 Enable QUIC Protocol – Google Chrome
In Google Chrome, enter chrome://flags into the address bar. Next, find Experimental QUIC protocol, select Enabled, and relaunch Chrome.
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Thank you for watching! Let us know in the comments below if you have any questions. Good luck on your online journey. 🚀
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