Issue while creating proxy server using regional external load balancer and regional internet NEG

[abir_younode]

I'm trying to create a proxy server using regional external application load balancer and regional internet NEG(FQDN) but facing error "503" and showing "no healthy upstream". It was working fine with global application load balancer and internet NEG. The purpose I'm trying to achieve  is to allow static external IP for whitelisting the outbound IP to the main server.

What should I do or am I missing anything?

Regards

[dar10]

@abir_younode See chapter 5 in https://a.co/d/gsJbTQx for a list of reference architectures for the 9 types of Google Cloud Load Balancers.

When you say "regional external application load balancer" do you mean "regional external HTTP(S) load balancer" (type 5 in page 216)?