Cloudflare proxy stops AWS network load balancer working

General
1

Hi guys,

I have a Fargate task connected to an AWS Network Load Balancer. I have made the task security group maximally permissive with cidr_blocks = ["0.0.0.0/0"]. I can point a CNAME record to NLB and with DNS-only I can connect to my task no problem. However, when I turn on proxying I fail to be able to connect. I could understand why this might not work if I had more restrictive CIDR blocks which did not include the Cloudflare proxy servers, however with all IPs allowed I am not sure why this stops the connection working.

Does anybody have any pointers?

2

Are you connecting on some specific, non standard ports?

3

Port 8000

4

That’d be the issue. Cloudflare doesn’t support port 8000.

5

Yep that was it, thanks!

6

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