Check the AKS cluster health
Start by checking the health of the overall cluster and networking.
This article is part of a series. Read the introduction here.
Tools:
AKS Diagnostics. In Azure portal, navigate to the AKS cluster resource. Select Diagnose and solve problems.

Diagnostics shows a list of results from various test runs. If there are any issues found, More info can show you information about the underlying issue.
This image indicates that network and connectivity issues are caused by Azure CNI subnet configuration.
To learn more about this feature, see Azure Kubernetes Service Diagnostics overview.