OCI Networking: Intermittent 'Connection Refused' scenarios When Accessing Load Balancer from Private Subnet
I'm converting an old project and I'm not sure how to approach This might be a silly question, but I'm working with an intermittent 'Connection Refused' behavior when trying to access my OCI load balancer from a private subnet... The load balancer is configured to route traffic to a set of compute instances in a different private subnet. Sometimes, I can successfully access the service, but at other times, I receive the behavior. I've ensured that the security lists for both subnets allow ingress and egress traffic on the required ports. Here's a brief description of my setup: - Load Balancer: Public with two backend sets. - Compute Instances: Two instances in a private subnet, running a web service on port 8080. I'm using the following Python code to test the connection: ```python import socket def check_service(host, port): with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: s.settimeout(5) # 5 seconds timeout try: s.connect((host, port)) print('Service is reachable') except socket.behavior as e: print(f'behavior: {e}') check_service('<load_balancer_ip>', 8080) ``` I've tried the following troubleshooting steps: 1. Verified security list rules and NACL settings. 2. Checked the health status of the backend set, which shows that both instances are healthy. 3. Increased the timeout in my Python script to account for potential latency. 4. Reviewed logging in my application for any signs of failure on the instances. Despite these efforts, the scenario continues sporadically. Is there something specific in the OCI networking setup that could cause this type of intermittent connectivity question? Any insights or suggestions would be greatly appreciated. This is part of a larger microservice I'm building. Is there a simpler solution I'm overlooking? Any pointers in the right direction?