I might not have the necessary credentials to sign into the virtual machine. I like this tool because it allows me to run detailed network tests, just like I would from a virtual machine, but without needing to sign-in. Running a Connectivity Check Between Azure Virtual Machines This indicated that there was a configuration issue of some kind, probably at the destination. And as you can see below, all 100 probes failed. I have run a test where vm-test-01 is trying to send RDP traffic (destination port 3389) to vm-test-02. This test can take a while because it really will send 100 packet tests from the source virtual machine to the destination virtual machine. Port: Enter the port that should be listening for the traffic.Virtual Machine: Select the destination virtual machine.Resource Group: Pick the resource group with the destination virtual machine.You can enter 0 if it is dynamic like most protocols are.Įnter the following information about the destination machine: Port: Enter the port that is used to send the desired protocol.Virtual Machine: Select the source virtual machine.Resource Group: Pick the resource group with the source virtual machine.Choose a subscription: Select the subscription from your tenant.You enter the following information about the source machine when using this tool: This is better than any ping because ping only does an “is it responding in a reasonable time?” test using ICMP. Using a Network Watcher extension that is installed in the source virtual machine, 100 probes (packet tests) are sent to the destination machine from a defined source port to a defined destination port. This tool, in Preview at the time of writing this article, performs an end-to-end test. They need to be able to because users are reporting that the services that this machine hosts are broken. The Diagram of the Azure Virtual Network, Generated by Network Watcher Topology Īdministrators have just reported that they can no longer sign into the application server (vm-petri-02). vm-petri-02: This is my demo application server that a security consultant has recently hardened.To access application servers, one must first log into vm-petri-01 and then jump from there to the required machine. I am only allowing remote desktop connections into this machine from outside of the virtual network. vm-petri-01: This is a “bastion host” or “jump box” machine.There are two virtual machines in a simple flat network: I have created a small demo lab in a resource group called rg-petri. In this post, I will show you how you can figure out the root cause of a communications failure between virtual machines. Network Watcher includes a number of tools that can be used in several scenarios. This is why Azure’s Network Watcher is a critical troubleshooting tool. ![]() What use would a virtual machine be if you cannot access the services that it hosts or if you cannot integrate it with other systems? Without network connectivity, resources in the cloud are useless. “Broad network access” is not one of NIST’s Essential Traits of a Cloud for no reason. Traffic Analytics processes your NSG Flow Log data enabling you to visualize, query, analyze, and understand your network traffic.įor more detailed information, see the Network Watcher overview page.In this post, I will demonstrate how you can use Azure’s Network Watcher to check if one Azure virtual machine can talk to another. ![]() ![]()
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