sudo cp /etc/ca-certificates.conf /etc/ca-certificates.conf.orig
sudo nano /etc/ca-certificates.conf
Change “mozilla/DST_Root_CA_X3.crt” in “!mozilla/DST_Root_CA_X3.crt” an save
sudo update-ca-certificates
#!/usr/bin/bash
# I exported the Zscaler certifcate out of Microsoft Cert Manager. It was located under 'Trusted Root Certification > Certificates' as zscaler_cert.cer.
# Though the extension is '.cer' it really is a DER formatted file.
# I then copied that file into Ubuntu running in WSL.
# Convert DER encoded file to CRT.
openssl x509 -inform DER -in zscaler_cert.cer -out zscaler_cert.crt
# Move the CRT file to /usr/local/share/ca-certificates
sudo mv zscaler_cert.crt /usr/local/share/ca-certificates
# Inform Ubuntu of new cert.
sudo update-ca-certificates