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Connectivity issues with particular applications

ChrisP-0619 0 Reputation points
2025-11-06T15:31:30.8+00:00

Hello,

I have a basic Azure VM running the Azure Windows environment. I am experiencing some connectivity issues with a particular application. Everything else works as expected. I recently migrated from an AWS VM, where the application worked just fine. Has anyone experienced this? Are there any settings or firewalls that I need to be aware of within Azure?

Thanks

Windows for business | Windows Client for IT Pros | Performance | Application technologies and compatibility

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  1. Tracy Le 2,900 Reputation points Independent Advisor
    2025-11-07T07:36:03.2533333+00:00

    Hello ChrisP-0619,

    You are correct to suspect firewalls. Since the application worked on AWS but not on your new Azure VM, this is a classic port-blocking issue.

    Azure has two firewalls you must check:

    1.Network Security Group (NSG): This is the main firewall outside your VM, similar to an AWS Security Group. The rules from AWS were not migrated.

    You must go to your VM in the Azure Portal -> click "Networking". Look at the "Inbound port rules" and add a new rule to "Allow" the specific port your application needs (e.g., TCP Port 8080).

    1. Windows Firewall: This is the firewall inside your VM. Check that the same port is also open there. The NSG is the most likely problem.

    If this solves your issue, please click "Accept Answer" to help others in the community!

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