Some websites are suddenly not functioning properly, "Your connection is not private, cert date invalid"

[marnus]

For the past 2 weeks or so I’m unable to visit protonmail.com. I’m getting the “Your connection is not private” message, with no option to advance manually. This persists regardless of which browser I use, with the exception of Tor.

Also, on odysee.com I’m not seeing icons and thumbnails anymore, and when doing a search on the site I receive no results. The site is working perfectly on my other devices.

[Berny]

@marnus Welcome.

Can you please provide a screenshot.

Link

 

 

[marnus]

@marnus Welcome.

Can you please provide a screenshot.

Link

 

 

Sure.

Here’s ProtonMail:
 

Here’s Odysee:

 

 

[marnus]

Also noticed that I cannot visit my browser’s website, brave.com.

[Berny]

@marnus Please check your Kaspersky reports ?

[Schulte]

Hello @marnus,

all of the sites mentioned use a certificate from 'Let's Encrypt' for the site itself or for parts of the site (thumbnails).
They had to replace an expired certificate. Probably your browser does not know the new certificate.

See also this article:

Link

 

[marnus]

Hello @marnus,

all of the sites mentioned use a certificate from 'Let's Encrypt' for the site itself or for parts of the site (thumbnails).
They had to replace an expired certificate. Probably your browser does not know the new certificate.

See also this article:

Link

 

Thank you. The only solution I haven’t tried is OS updates.  I doubt that Windows 7 will have updates available to fix the issue though. Really not keen on switching to Windows 10. This sucks.

Thanks again.

[Schulte]

Hi @marnus,

I am also using Win7 right now and have no problem with the certificates.
But unlike you, I'm running Firefox in the current version.

[marnus]

Hi @marnus,

I am also using Win7 right now and have no problem with the certificates.
But unlike you, I'm running Firefox in the current version.

• I saw that some people have no issues with Firefox after the certificate expiration, and tried installing the ISRG Root X1 certificate as explained here - https://superuser.com/questions/1679135/dst-root-ca-x3-expiration-on-windows7-which-update-i-need-to-install-are-there. No luck, unfortunately.
  
  I have two problems:
  1. I cannot install Windows updates, as it crashes my system.
  2. Firefox is SUPER slow on my PC.
  
  Do you know if there are any solutions that would enable me to keep using Brave Browser?

[marnus]

Found this - https://docs.microsoft.com/en-us/answers/questions/574761/getting-neterr-cert-date-invalid.html

Going to give it a try.

[Schulte]

Looks good...

[marnus]

Looks good...

It worked!!! Everything is working 100% again! 

Thanks a lot for your help! Would not have found that without you! <3