VPN connection issue

Question

VPN connection issue

Deepak Kumar 105

VPN connection issue, our agents are facing latency while working inside the client VM, pls help me out

Manish Deshpande 5,430 Reputation points Microsoft External Staff Moderator

2026-01-13T13:39:23.28+00:00
Hello @Deepak Kumar

Thanks for reaching out to Microsoft Q&A. To understand the issue better could you please provide response to this ask?

Are the users connecting through a third‑party VPN solution (for example, Cisco, FortiGate, Palo Alto, Zscaler, etc.)?

Is the VPN:

Client‑to‑Site (users connecting from their devices), or

Site‑to‑Site (corporate network to Azure)?

Can you confirm the VM size/SKU currently in use and the region?

Does the latency still occur when users access the VM without connecting to the VPN?

Are there any high resource usage alerts (CPU, memory, network) observed on the Azure VM during the issue?

VM platform for clients: Azure, AWS, on-premises Hyper-V/VMware, or other?
Deepak Kumar 105 Reputation points

2026-01-13T13:55:12.6933333+00:00

Hi Manish, can we connect on ms teams to elaborate more about the Azure VPN connection issue

Answer accepted by question author

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Manish Deshpande 5,430 Reputation points Microsoft External Staff Moderator

2026-01-13T13:39:23.28+00:00

Hello @Deepak Kumar

Thanks for reaching out to Microsoft Q&A. To understand the issue better could you please provide response to this ask?

Are the users connecting through a third‑party VPN solution (for example, Cisco, FortiGate, Palo Alto, Zscaler, etc.)?

Is the VPN:

Client‑to‑Site (users connecting from their devices), or

Site‑to‑Site (corporate network to Azure)?

Can you confirm the VM size/SKU currently in use and the region?

Does the latency still occur when users access the VM without connecting to the VPN?

Are there any high resource usage alerts (CPU, memory, network) observed on the Azure VM during the issue?

VM platform for clients: Azure, AWS, on-premises Hyper-V/VMware, or other?
Deepak Kumar 105 Reputation points

2026-01-13T13:55:12.6933333+00:00

Hi Manish, can we connect on ms teams to elaborate more about the Azure VPN connection issue

Answer 1

Venkatesan S 7,635 Microsoft External Staff Moderator

Hi Deepak Kumar,

Thanks for reaching out in Microsoft Q&A forum,

As discussed through offline the issue not with azure side S2S VPN side.

Open Event Viewer on the Windows client VM by pressing Windows + X and selecting Event Viewer, or searching for it in the Start menu.

Navigate to Windows Logs > Application and System logs first for VPN-related entries.

For detailed VPN diagnostics, expand Applications and Services Logs > Microsoft > Windows > DeviceManagement-Enterprise-Diagnostics-Provider > Admin.

Kindly let us know if the above helps or you need further assistance on this issue.
Please do not forget to and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.

Deepak Kumar 105 Reputation points

2026-01-15T16:26:37.09+00:00

can we check with Azure VPN connection or network team so they can help me to fix it as we are getting the same issue again & again.
Vallepu Venkateswarlu 7,935 Reputation points Microsoft External Staff Moderator

2026-01-15T16:51:15.9166667+00:00

Hi @ Deepak Kumar,

Thanks for sharing the response.

Could you please describe the issue in detail, including the exact problem you are facing?

Kindly share the requested details via a private message so we can proceed with further troubleshooting.
Deepak Kumar 105 Reputation points

2026-01-27T11:04:42.3533333+00:00
Hi Vallepu Venkateswarlu Could you please:

Share the Microsoft support case ID, and

Confirm availability for a joint troubleshooting call involving (you) Microsoft, our Client VM team, and our AVD team (me)?

The client is keen to connect directly with Microsoft to continue troubleshooting and resolve this issue on priority, as the VDI is freezing multiple times during active usage and significantly impacting productivity.

Once the case ID is available, we are happy to coordinate and provide consent for Microsoft to review both environments together during the call.

Looking forward to your confirmation so we can move this forward quickly.

Best regards, Deepak
Venkatesan S 7,635 Reputation points Microsoft External Staff Moderator

2026-01-28T09:14:32.1733333+00:00

Hi Deepak,

As discussed in our email, the AVD team is currently working on this. You will receive further updates from them soon.

Answer 2

If your agents are experiencing latency while working inside the client VM, it could be related to the VPN configuration or network settings. Here are some considerations to help troubleshoot the issue:

VPN Type: Ensure that the VPN type being used is appropriate for the workload. Some VPN configurations can introduce latency, especially if they are forced-tunnel VPNs that route all traffic through the VPN.
Network Bandwidth: Check the available bandwidth for the VPN connection. If the traffic volume is close to the limit of the bandwidth available to the Azure VPN gateway, it could lead to latency issues. Monitor the data being received and transmitted over the VPN connection to ensure it is within acceptable limits.
Firewall Configuration: Verify that the firewall settings on the guest operating system of the Azure VMs are configured correctly to allow permitted traffic from the on-premises IP ranges. Misconfigured firewalls can also lead to latency.
UDP Issues: If the remote connection reports issues with UDP, ensure that UDP port 3478 is open on your network. Blocking this port can lead to problems with remote connections, including increased latency.
Network Configuration: Review the network configuration of the Azure Lab Services or the Azure Virtual Desktop environment to ensure that it is set up correctly for optimal performance.

By addressing these areas, you may be able to reduce latency and improve the performance of the VPN connection for your agents.

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VPN connection issue

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