I somehow broke a working SSL LB with a minor change and now cannot get it to work again.
VM Instance - - Showing unhealthy and giving a 502 error through the external IP (but taking the correct SSL certificate) - Includes firewall rules separately for both 443 and 80 ports
LB - - Front-end is set for HTTPS traffic with the SSL certificate (issued by Let's Encrypt) - Back-end is pointing to 443 port of the VM instance above via HTTPS protocol (and a zone)
Firewall - - In addition to the VM instance above, the firewall rule also exists for the LB from IP ranges: 130.211.0.0/22, 35.191.0.0/16 via 443 port
What should I do? I restarted the VM instance as well.