VM is not connecting through rdp

Question

VM is not connecting through rdp

Aritra Basu 15

my vm is not connecting, always failing and diagnostic reports says all are good and healthy, I need a support executive to assist on call.

Siddhesh Desai 4,025 Reputation points Microsoft External Staff Moderator

2026-02-20T23:08:18.49+00:00

Hi Aritra,

Thank you for reaching out to Microsoft Q&A.

When an Azure Virtual Machine (VM) shows healthy status and green diagnostics but still fails to connect (RDP/SSH), the issue is usually not with the VM compute layer itself. In most cases, the problem lies in the network path or OS-level access. Azure VM diagnostics primarily validate host availability, power state, and basic platform health. They do not fully validate Network Security Group (NSG) rules, User Defined Routes (UDR), guest OS firewall rules, or RDP/SSH service configuration. As a result, connectivity can fail even though the VM appears healthy in the portal. Common causes include blocked inbound ports, incorrect routing, firewall restrictions inside the VM, or corrupted RDP/SSH configuration.

Refer below points to resolve this issue or use them as a workaround:

Verify Network Security Group (NSG) rules

Ensure the NSG associated with the VM’s NIC or subnet allows inbound traffic on the required port:

TCP 3389 for Windows (RDP)

TCP 22 for Linux (SSH)

Check rule priority carefully. Lower priority numbers take precedence, and a deny rule with higher priority can block traffic even if an allow rule exists.

Confirm the source IP range is correct (for example, your public IP or a trusted CIDR range).

Check User Defined Routes (UDR) and effective routes

Validate that there are no custom route tables redirecting traffic to a firewall, NVA, or gateway that cannot forward the traffic.

Use Network Watcher → Effective routes on the VM NIC to confirm traffic is routed to the Internet or correct next hop.

Misconfigured UDRs are a common reason connectivity fails while diagnostics remain healthy. [

Reset RDP or SSH configuration from Azure Portal

For Windows VMs:

Go to VM → Help → Reset password

Select Reset configuration only

This restores RDP settings and Windows Firewall rules without changing credentials

For Linux VMs:

Use Reset password to re-enable SSH access if configuration or keys are corrupted

Use Azure Network Watcher – Connectivity Check

Run a connectivity check from Network Watcher to validate:

NSG flow

Route table behavior

Next hop reachability

This helps identify exactly where traffic is being dropped.

Access the VM using Azure Serial Console (workaround)

Serial Console bypasses networking entirely and provides direct console access.

Use this method if RDP/SSH is completely unavailable.

From Serial Console, you can:

Fix OS firewall rules

Restart RDP/SSH services

Correct network configuration inside the VM

Redeploy the VM (last resort)

Redeploying moves the VM to a new Azure host without deleting disks or configuration.

This is useful if the underlying host or network fabric is suspected.

Redeploy does not change IP, OS disk, or data.

Reference: https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/troubleshoot-rdp-connection
Manish Deshpande 4,450 Reputation points Microsoft External Staff Moderator

2026-02-23T22:28:41.22+00:00

Hi Aritra,

I wanted to check if my last response made sense. I’d be glad to assist further or explain anything in more detail and please accept as Yes and upvote if the answer is helpful so that it can help others in the community
Manish Deshpande 4,450 Reputation points Microsoft External Staff Moderator

2026-02-27T08:29:10.08+00:00

Hi Aritra,

I wanted to check if my last response made sense. I’d be glad to assist further or explain anything in more detail and please accept as Yes and upvote if the answer is helpful so that it can help others in the community

2 answers

Your answer

Manish Deshpande 4,450 Reputation points Microsoft External Staff Moderator

2026-02-23T22:28:41.22+00:00

Hi Aritra,

I wanted to check if my last response made sense. I’d be glad to assist further or explain anything in more detail and please accept as Yes and upvote if the answer is helpful so that it can help others in the community
Manish Deshpande 4,450 Reputation points Microsoft External Staff Moderator

2026-02-27T08:29:10.08+00:00

Hi Aritra,

I wanted to check if my last response made sense. I’d be glad to assist further or explain anything in more detail and please accept as Yes and upvote if the answer is helpful so that it can help others in the community

Answer 1

Hi Aritra,

Thank you for reaching out to Microsoft Q&A.

Just wanted to add few lines to Siddesh Response.

If your Azure Virtual Machine shows up as Healthy and all diagnostics are green, but you still can't connect via RDP, it usually means the problem isn't with the Azure compute host. The health checks just confirm that the platform is running (like power, host status, and basic fabric stuff), but they don’t check the network path or guest OS access. So, even if your VM looks healthy in the portal, you can still run into connectivity issues.

Actions to perform:

1. Verify Network Security Group (NSG) rules
Ensure that the NSG associated with the VM’s NIC or subnet allows inbound traffic on:

TCP 3389 for Windows (RDP)

Confirm that:

The Allow rule has a higher priority than any Deny rule
The source IP range includes your client’s public IP or trusted CIDR

2. Take a look at User‑Defined Routes (UDR) and Effective Routes
If you’ve got a custom route table linked, your traffic might be getting sent to a firewall, NVA, or gateway that can’t handle RDP traffic.

Hop into Network Watcher → Effective routes on the VM NIC
Double-check that the next hop for 0.0.0.0/0 or client traffic is set up right

3.Resetting RDP settings from the Azure portal No worries
This method is totally safe, supported by Microsoft, and won’t mess with your credentials.

Head over to VM → Help → Reset password
Pick Reset configuration only

Doing this will bring back:

Your RDP service settings
Any Windows Firewall rules tied to RDP.

4.Leverage Azure Network Watcher – IP Flow / Connectivity Check for precise diagnostics

Hey, let's run a quick connectivity check to confirm the following:

NSG rules are functioning as expected
The route table is configured correctly
The next-hop is reachable

This approach will allow you to quickly identify exactly where the traffic is being blocked.

5.Use Azure Serial Console to access the VM
If you can’t use RDP at all, the Serial Console is a handy workaround since it skips networking and gives you direct access to the OS. With Serial Console, you can check Windows Firewall rules, restart the RDP service, or fix network and policy settings right at the OS level.

6.Redeploy the VM (Mostly this step fixes the issue)
When you redeploy, your VM gets moved to a different Azure host, but don't worry it keeps the same OS disk, data, IP, and setup.

It's best to try this only after you've checked for any network or OS issues first.
Conclusion:

A healthy VM status confirms that Azure infrastructure is functioning correctly. RDP connectivity issues are most often caused by NSG rules, routing configuration, or OS‑level settings, not the Azure compute layer itself. Following the steps above will help isolate and resolve the issue in a supported manner.

Troubleshoot RDP connections to Azure VMs
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/troubleshoot-rdp-connection
Detailed RDP troubleshooting in Azure
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/detailed-troubleshoot-rdp

I have requested few details to connect with you over a team call pls share the details at the earliest.

Have you noticed if the crashes happen with certain apps or is it just random across different ones?
Are there any error messages popping up when things crash?

Thanks,
Manish.

Answer 2

Marcin Policht 82,360 MVP Volunteer Moderator

Make sure to follow https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/troubleshoot-rdp-connection

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin

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VM is not connecting through rdp

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