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Started working today and Chromium on Ubuntu suddenly throws
NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED on a well known host.
Already tried deleting .pki/nssdb/*, but nothing changed.
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ERR_CERTIFICATE_TRANSPARENCY_REQUIRED” message occurs when you try to visit HTTPS websites that is having SSL/TLS certificate errors and creates issues with the connection between your device and the remote server. Most frequently, it is the result of an SSL certificate being corrupted, expired, or misconfigured.
Certificate Transparency is now mandatory as of April 30, 2018. Today is the first day that Google is requiring all Certificate Authorities to log the SSL certificates they issue in certificate transparency logs.
When someone submits a valid certificate to a log, the log responds with a signed certificate timestamp (SCT), which is simply a promise to add the certificate to the log within some time period. The time period is known as the maximum merge delay (MMD).
I have the same problem. This is what I found out so far:
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1641380 https://bugs.chromium.org/p/chromium/issues/detail?id=664177 https://knowledge.symantec.com/support/ssl-certificates-support/index?page=content&id=ALERT2160
Are you also using Version 53.0.2785.143?
Looks like it is important when the build happened: https://chromium.googlesource.com/chromium/src/net/+/master/cert/ct_policy_enforcer.cc#44
Looks like the best workaround is to upgrade to 54.x, wait for a patch or use another browser.
Update: A new version of chromium, that fixes the problem, was just released (at least for ubuntu).
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quick tip: set system date a few days back
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