Chrome, when going to the site, gives the message “ERR_CERT_COMMON_NAME_INVALID”? Because of this, it is impossible to visit the resource, since this error is associated with failures of the SSL / TSL certificate, which guarantees the security of browsing.
The most common causes of the error are as follows:
- the security certificate is incorrectly configured on the server side – for example, the subjectAlternativeName extension is not tied to the certificate;
- the user device has incorrect network settings, time, date, time zone;
- Chrome addon interferes with SSL / TSL certificate
How to fix ERR_CERT_COMMON_NAME_INVALID error?
Make sure the time, date, and time zone on your device are correct. Also, try visiting the site in incognito mode – often this happens without warning about the security of the connection.
# 1: fighting a buggy Chrome extension
If the error ERR_CERT_COMMON_NAME_INVALID does not appear in incognito mode, but it occurs during standard viewing, then it is still unknown which Chrome add-on is to blame. The problem is solved as follows:
- go to the browser settings: “Additional tools” => “Extensions” and turn off all add-ons;
- enable one extension at a time and update each time the page on which the security warning was previously issued;
- repeat the cycle until you find the add-on, when activated, the error appears;
- remove the buggy extension – there is almost always the same functionality.
# 2: check the work of the antivirus or firewall
Turn off your antivirus or firewall and refresh the page. If the attempt is successful, then the root of the problem is in the antivirus software. In order not to reduce the security of browsing, it is worth enabling the https scan option in the antivirus or firewall.
# 3: clear the cache
- Press Ctrl + Shift + Del while Chrome is running – a window for deleting user data will open. It can also be called from the menu “Additional tools” => “Clear history”.
- Delete only “cookies” and “cache files”. Make sure all time is selected at the top of the window, not just the last day.
# 4: contacting the site administrator
Sometimes only the resource administrator is able to solve the problem. Please report a bug. He may have incorrectly installed the SSL certificate and it is preferable that he create a new one.
# 5: disable security warnings
This is an extreme measure, since only the consequence of the inconsistency is eliminated, but not the cause. However, the ERR_CERT_COMMON_NAME_INVALID error will not appear when security notifications are disabled.