Cumulus Support

If you get an error uploading to Windy, or connecting to another web site that uses a Let's Encrypt certificate when running under Mono, then you need to "fix" the Mono installation as follows (Debian/RaspberryPi OS):

1. Remove the DST_Root_CA_X3 certificate from the configuration

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   sudo sed -i '/^mozilla\/DST_Root_CA_X3.crt$/ s/^/!/' /etc/ca-certificates.conf
   sudo update-ca-certificates
   

2. To be sure, get the old certificate out of the way

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   sudo mv -v /etc/ssl/certs/DST_Root_CA_X3.pem /etc/ssl/certs/DST_Root_CA_X3.pemxxx

   If the command fails the certificate has already been deleted: that is OK
   If the command goes well the certificate is now unreachable: that is OK
3. Update the system certificate store

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   sudo update-ca-certificates

4. Synchronise the system certificates into Mono

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   sudo cert-sync /etc/ssl/certs/ca-certificates.crt

Now you are done and the transfers with HTTPS should go without error (check the logfile please).

Background: This error is caused by an expired root certificate for Let's Encrypt. Linux and Windows ignore this expired certificate if the current certificate is present. Mono however fails to verify the connection if the expired certificate is present, ignoring the current certificate!

The commands above remove the expired certificate from the system certificate store, then resynchronise the system store into the Mono certificate store.

Yes that worked just fine.

Thanks , I had a problem with WeatherCloud and following your advice it works like a charm now, thanks a lot, this forum has helped me a lot setting up CMX in MacOs and recently in RaspBerryPi