Unable to connect to VM via 2nd NIC

Question

Some time ago I migrated the network interface(NIC2 for short) from a old Windows Server 2012 R2 VM(VM1) to a Windows Server 2019 VM(VM2).

I migrated the public IP from another VM(VM3) to NIC2 recently, but I can not connect to VM2 via this public IP. I can connect to VM2 using public IP of 1st NIC without problem.

Network Security Group associated with NIC2 and Windows Firewall on VM2 has been configured to open needed ports.

I noticed that NIC2 has no internet access in Control Panel\Network and Internet\Network Connections on VM2.

How do I connect to VM via NIC2?

Answer 1

Hi,

As you have already checked Windows FW and ports, I will suggest you to check the IP flow verify by using Azure Network Watcher and follow the troubleshooting steps that might help. If all the steps are exhuasted I will suggest you to raise a support case from the Portal.

virtual-network-troubleshoot-connectivity-problem-between-vms
network-watcher-ip-flow-verify-overview
diagnose-vm-network-traffic-filtering-problem

Hope this helps.
JS

==
Please Accept the answer if the information helped you. This will help us and others in the community as well.

Answer 2

Hi,

Thanks for reply.

I verified that the my public IP passed IP flow verify and NSG diagnostics in Network Watcher:

I also verified the firewall on my side:

And Windows Firewall settings on VM:

It seems all OK. Any suggestion?

Answer 3

I found the solution. According to this forum post, there is no default gateway on 2nd NIC by default.
So I setup IPv4 in properties of 2nd NIC in VM manually and input the same gateway and DNS Server of another NIC.

Now I can connect to VM via 2nd NIC. :D