SSL

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 https://www.example.com/monitoring
--2021-09-30 21:34:39--  https://www.example.com/monitoring
Resolving www.example.com (www.example.com)... 93.184.216.34
Connecting to www.example.com (www.example.com)|93.184.216.34|:443... connected.
ERROR: The certificate of `www.example.com' is not trusted.

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

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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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