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articles/virtual-network/virtual-network-troubleshoot-connectivity-problem-between-vms.md

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title: Troubleshooting connectivity problems between Azure VMs
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description: Learn how to troubleshoot and resolve the connectivity problems that you might experience between Azure VMs.
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description: Learn how to troubleshoot and resolve the connectivity problems that you might experience between Azure virtual machines (VMs).
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services: virtual-network
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author: asudbring
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manager: dcscontentpm
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tags: azure-resource-manager
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ms.service: virtual-network
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ms.topic: troubleshooting
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ms.workload: infrastructure-services
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ms.date: 10/30/2018
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ms.date: 07/19/2022
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ms.author: allensu
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---
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## Symptom
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One Azure VM cannot connect to another Azure VM.
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One Azure VM can't connect to another Azure VM.
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## Troubleshooting guidance
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6. [Check whether traffic is blocked by ACLs for the classic VM](#step-6-check-whether-traffic-is-blocked-by-acls-for-the-classic-vm)
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7. [Check whether the endpoint is created for the classic VM](#step-7-check-whether-the-endpoint-is-created-for-the-classic-vm)
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8. [Try to connect to a VM network share](#step-8-try-to-connect-to-a-vm-network-share)
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9. [Check Inter-Vnet connectivity](#step-9-check-inter-vnet-connectivity)
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9. [Check Inter-VNet connectivity](#step-9-check-inter-vnet-connectivity)
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## Troubleshooting steps
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### Step 2: Check whether network traffic is blocked by NSG or UDR
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Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [NSG Flow Logging](../network-watcher/network-watcher-nsg-flow-logging-overview.md) to determine whether there is a Network Security Group (NSG) or User-Defined Route (UDR) that is interfering with traffic flow.
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Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [Connection troubleshoot](../network-watcher/network-watcher-connectivity-overview.md) to determine whether there's a Network Security Group (NSG) or User-Defined Route (UDR) that is interfering with traffic flow.
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### Step 3: Check whether network traffic is blocked by VM firewall
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netstat -l
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```
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- Run the **telnet** command on the virtual machine itself to test the port. If the test fails, the application or service is not configured to listen on that port.
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- Run the **telnet** command on the virtual machine itself to test the port. If the test fails, the application or service isn't configured to listen on that port.
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### Step 5: Check whether the problem is caused by SNAT
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### Step 8: Try to connect to a VM network share
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If you cannot connect to a VM network share, the problem may be caused by unavailable NICs in the VM. To delete the unavailable NICs, see [How to delete the unavailable NICs](/troubleshoot/azure/virtual-machines/reset-network-interface#delete-the-unavailable-nics)
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If you can't connect to a VM network share, the problem may be caused by unavailable NICs in the VM. To delete the unavailable NICs, see [How to delete the unavailable NICs](/troubleshoot/azure/virtual-machines/reset-network-interface#delete-the-unavailable-nics)
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### Step 9: Check Inter-Vnet connectivity
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### Step 9: Check Inter-VNet connectivity
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Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [NSG Flow Logging](../network-watcher/network-watcher-nsg-flow-logging-overview.md) to determine whether there is a NSG or UDR that is interfering with traffic flow. You can also verify your Inter-Vnet configuration [here](https://support.microsoft.com/en-us/help/4032151/configuring-and-validating-vnet-or-vpn-connections).
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Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [NSG Flow Logging](../network-watcher/network-watcher-nsg-flow-logging-overview.md) to determine whether there's an NSG or UDR that is interfering with traffic flow. You can also verify your Inter-VNet configuration [here](https://support.microsoft.com/en-us/help/4032151/configuring-and-validating-vnet-or-vpn-connections).
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### Need help? Contact support.
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If you still need help, [contact support](https://portal.azure.com/?#blade/Microsoft_Azure_Support/HelpAndSupportBlade) to get your issue resolved quickly.

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