@woozle I will try and i'll see how it goes(Archer AX53 EU). Thank you!

UPDATE:Now it's working with exception added.

 Hi @BeastRules2001 

Please click on Here for more details and suggestions about Why TP-Link HTTPS web interface is detected as unsecured by some web browsers.

  @Joseph-TP Ok,i checked. What i mean is the antivirus encountered me a warning (I was using AVG Antivirus 3 yearly subscription) that the certificate is invalid and not the browser itself.  
I had enabled Web Shield which protects me against web attacks and blocking unsafe downloads,i don't want my laptop to be filled with viruses and maybe that triggered the warning. Is that a false positive or what? Thank you!

Hi  @BeastRules2001,

There are several possible reasons for invalid certificates: expired certificates, incomplete certificate chains, mismatched domain names, incorrect date and time settings, middleman attacks, etc.

To rule out browser issues first, please compare different browsers to access the same website.

To rule out router network issues, you can compare whether the website can be accessed normally under different networks?

If this situation is accidental, it is recommended that you continue to observe for a while. If it occurs again, please confirm whether it is a problem under different networks or on different browsers?

In this way, we can proceed to the next step of problem location next time.