I can't get a VM to communicate with On-Prem network

Hello @Jay Urbina

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To troubleshoot the communication issue between your Azure VM and your on-premises network, follow these steps:

Step 1: Verify Network Configuration

Check the network configuration of your Azure VM. Ensure that it is connected to the correct Virtual Network (VNet) and Subnet that you intend to use for communication with your on-premises network.

Step 2: Check VPN/ExpressRoute Connection

If you are using a VPN or ExpressRoute to connect Azure to your on-premises network, verify that:

• The VPN gateway is configured correctly.
• The connection status is "Connected."
• The local network gateway settings (IP address and address space) are correct.

Step 3: Review Network Security Groups (NSGs)

Examine the Network Security Groups associated with your Azure VM's subnet and network interface. Ensure that:

• Inbound and outbound rules allow traffic from your on-premises network.
• There are no deny rules that could be blocking the communication.

Step 4: Validate Routing

Check the routing configuration:

• Ensure that the Azure VNet has a route to your on-premises network.
• Verify that your on-premises network can route traffic back to the Azure VNet.

Step 5: Test Connectivity

Use tools like ping or telnet from both the Azure VM and an on-premises machine to test connectivity. This will help identify if the issue is with the network or the specific application.

Final Answer

If you follow these steps and still cannot establish communication, consider reviewing Azure documentation for specific configurations or reaching out to Azure support for further assistance.

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