Some 502 errors in GCP HTTP Load Balancing

Question

Our load balancer is returning 502 errors for some requests. It is just a very low percentage of the total requests, we have around 36000 request per hour and about 40 error

Answer 1

checking whether your backend firewall block google's cloud cdn ip address or not(not just 130.211.0.0/22),all those addresses can be found here:https://cloud.google.com/compute/docs/faq#find_ip_range