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I don't know where to put this as it deals with the openttdcoop website and not the openttd website. I'm putting this here as it's the closest thing to the target place.
Able to access https://wiki.openttdcoop.org
Google Chrome 75.0.3770.142 (Official Build) (32-bit) (cohort: Stable) running on Windows 7 (Build 7600) returns NET::ERR_CERT_DATE_INVALID when trying to access https://wiki.openttdcoop.org. You can still access it if you change "https" to "http".
Expired certificate information