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I'm constantly getting outdated LetsEncrypt certs from Stackoverflow and can't access the website. Seems like it's more of a forum related to developing web using LetsEncrypt but I also thought this is where people would know the best.
I don't know what triggered this but from today, Stackoverflow is keep showing an outdated certificate that is automatically banned by Chrome. I can't access to any of Stackoverflow & sibling sites. It's only happening on my PC and my laptop, second PC can access to Stackoverflow and see right certs. Makes me worry about possible malware.
The bad cert Stackoverflow shows some different property compared to the right one:
- valid date has been expired. It's valid from Oct ?, 2020 ~ Jan 3, 2021
- Certificate's serial number hash was different
- Certificate's issuer was slightly different. The right one said: CN=R3, O=Let's Encrypt, C=US but the bad one says: CN=Let's Encrypt authority x3
(This is the major reason why I'm asking on this community.)
What's going on? I can't connect to Reddit either and I think there's some relation to this issue.
I initially erased Chrome's cache and it went away but shortly after it came back. It's again not working.