I had the same Toast message which was rejected for security. It was also a certificate for me, but the solution was unexpected. The system time of my device was turned off quite a bit (almost a year), and this led to a failure of the ssl connection. Correcting time by deciding this for me. (Thanks to the Google Accounts page, which also found the same error in the browser and gave a very good explanation of the reason.)
mvandillen
source share