How to fix Load balancer and AKS connection issues

Question

Hi,
My azure Load balancer VMSS status showing un healthy and my application is down since the load balancer can not forward the incoming traffic to AKS but I don't see any issue with AKS service, all the container/pods are running as expected, I verified by following the guide lines from here
[https://learn.microsoft.com/en-us/troubleshoot/azure/azure-kubernetes/connection-issues-application-hosted-aks-cluster
Attached is what I can see in Load balancer Insights..

Answer 1

Can you please share a screenshot of the issue?

I had a similar issue few months ago. I followed these steps while troubleshooting, my issue was fixed.

Please have a look! might be helpful to check it out.

[https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot-health-probe-status

Answer 2

Hi,

I would suggest you to take a packet capture on the Linux instances and check for the health probe that you have configured. If you have configured for the TCP probe, check if the TCP handshake is happening fine. If it is a HTTP probe, check for the 200 response from your server. If probe looks good, then initiate traffic to the lb and then try to track that session in your capture to figure out.