My website https://yintrust.com uses a Let’s Encrypt certificate, which works fine in any browser, but starting from last month, The certificate is not signed by a trusted authority is displayed on the Android 6.0.1 browser. This is weird, it was displaying fine before and suddenly it has problems. …

Welcome @howiezhao The site that fails is using the "short" certificate chain. The site that works has the normal long chain. There was an error on Nov13 when yintrust was renewed that caused this. Just renewing yintrust cert should fix that. You can see the cert that your site uses with a website…

The certificate is not signed by a trusted authority

Help

Bruce5051 December 22, 2023, 3:14am 3

Also see Long (default) and Short (alternate) Certificate Chains Explained

4 Likes

Topic		Replies	Views
Incompatibility with Android 6.0 Help	3	2019	August 2, 2017
Connection is not private on Android Chrome Help	7	4072	September 30, 2021
Let's Encrypt on Android Devices with Older Browsers Help	16	7867	July 13, 2017
On Android 6.0.1 the Certificate is untrusted Server	10	15945	December 28, 2015
Certificate problems on older android devices Server	5	5824	August 6, 2016

The certificate is not signed by a trusted authority

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