You have an application that receives SSL-encrypted TCP traffic on port 443.

[Reference:https://cloud.google.com/load-balancing/docs/ssl, , SSL Proxy Load Balancing support for the following ports: 25, 43, 110, 143, 195, 443, 465, 587, 700, 993, 995, 1883, 3389, 5222, 5432, 5671, 5672, 5900, 5901, 6379, 8085, 8099, 9092, 9200, and 9300. When you use Google- managed SSL certificates with SSL Proxy Load Balancing, the frontend port for traffic must be 443 to enable the Google-managed SSL certificates to be provisioned and renewed., https://cloud.google.com/load-balancing/images/choose-lb.svg, , , ]