So its happened again. The gmail cert has expired.
Previous issue 2 years ago.
Updated to verison ScreenConnect_6.0.11622.6115_Install but didn't help. Downloaded the latest prealpha ScreenConnect_6.1.12103.6212_Debug.tar.gz but it doesn't yet have the new cert.
/opt/screenconnect/App_Runtime/etc/.mono/certs/CA/tbp-BBDCE13E9D537A5229915CB123C7AAB0A855E798.cer is expired
$ wget https://pki.google.com/GIAG2.crt --no-check-certificate
$ sha1sum GIAG2.crt
$ cp GIAG2.crt /opt/screenconnect/App_Runtime/etc/.mono/certs/CA/tbp-d6ad07c6675630f57b927f66be8ce1f768f87948.cer
$ sudo /etc/init.d/screenconnect restart
Email login now works. I don't know if it was necessary to rename cert file.
Customer support service by UserEcho