Im having the same issue with CumulusMX 3.14.0(3159)

Windy: ERROR - The SSL connection could not be established, see inner exception.

Is your SSL certicate still valid?

@korina
Problem solved
Your SSL certificate (Let's Encrypt R3 intermediate CA ) expired on 30 sep 2021 but the raspberry pi running cumulusmx still use it, so the solution was to disable the ca-certificate.

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

PS: My station ID is f04aba5b

@korina
Problem solved
Your SSL certificate (Let's Encrypt R3 intermediate CA ) expired on 30 sep 2021 but the raspberry pi running cumulusmx still use it, so the solution was to disable the ca-certificate.

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

PS: My station ID is f04aba5b

Im having the same issue with CumulusMX 3.14.0(3159)

Windy: ERROR - The SSL connection could not be established, see inner exception.

Is your SSL certicate still valid?