Old Let’s Encrypt Root Certificate Expiration workaround

The expiring Let’s Encrypt DST Root CA X3 can cause problems on old servers:

root@server:/etc# wget
--2021-09-30 21:34:39--
Resolving (
Connecting to (||:443... connected.
ERROR: The certificate of `' is not trusted.

Fortunately there is an easy workaround to ensure the expired chain is not checked.


SSL Debugging with Arduino / ESP8266

I recently bought the 2.9″ ESPaper Plus Kit, WiFi ePaper display from ThingPulse.

To get this device working with my ansible configured SSL webproxy I had to get some additional debugging skills...


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