Struggling with traffic issues in Azure Virtual Machines? Learn how to use Azure Network Watcher’s Effective Security Rules to diagnose and fix blocked traffic in your network security group (NSG) configuration.
Table of Contents
Question
You have a network security group (NSG) assigned to a subnet that contains three Azure Virtual Machines named VM1, VM2, and VM3.
VM1 and VM2 receive traffic as planned. However, VM3 does not receive traffic on the same ports as VM1 and VM2. You suspect that the traffic is blocked.
You need to use Azure Network Watcher to determine whether traffic to VM3 is blocked.
What should you use to diagnose the issue?
A. Effective security rules
B. NSG diagnostics
C. Next hop
D. Packet capture
Answer
A. Effective security rules
Explanation
Effective security rules show all the NSGs associated with the virtual machines and the Network interfaces. This tool shows the NSGs that are in the flow of the traffic and blocks traffic flow.
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