Create cannot-access-hyper-v-virtual-machine-connect.md

Author: v-lianna

support/windows-server/virtualization/cannot-access-hyper-v-virtual-machine-connect.md

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+---
+title: Can't Access Hyper-V Virtual Machines Via VM Connect
+description: Describes a
+ms.date: 08/13/2025
+manager: dcscontentpm
+audience: itpro
+ms.topic: troubleshooting
+ms.reviewer: kaushika, simonw, v-lianna
+ms.custom:
+- sap:virtualization and hyper-v\configuration of virtual machine settings
+- pcy:WinComm Storage High Avail
+---
+# Unable to access Hyper-V virtual machines via VM Connect: "Local security authority cannot be contacted"
+
+This article addresses an issue where users are unable to connect to Hyper-V virtual machines (VMs) through VM Connect due to a persistent authentication error. The root cause and resolution steps are provided to help restore functionality.
+
+## Prerequisites
+
+Before proceeding, ensure the following:
+
+* Administrative access to the affected server.
+* A working server with the correct TLS cryptography registry keys to export.
+* Knowledge of registry editing and system reboot procedures.
+
+## Symptoms
+
+Users encountering this issue may experience the following:
+
+* Persistent authentication error message: "Local security authority cannot be contacted."
+* Inability to connect to any virtual machines, regardless of the operating system (Windows or Linux), via VM Connect.
+* The issue began approximately 20 days before the case was logged.
+
+## Cause
+
+The problem is caused by missing TLS cryptography registry keys required for the SSL/TLS handshake. These keys are crucial for secure communication during the authentication process. Their absence leads to a failure in the SchannelInit process, which prevents authentication attempts from succeeding.
+
+## Solution: Restore missing TLS cryptography registry keys
+
+To resolve the issue, follow these steps:
+
+1. **Export TLS cryptography registry keys from a working server:**
+
+   * On a functioning server, open the Windows Registry Editor (regedit).
+   * Navigate to the following registry path:
+
+     HKEY\_LOCAL\_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\SecurityProviders\\SCHANNEL\\Protocols
+
+   * Right-click the Protocols key and select **Export**.
+   * Save the exported .reg file to a secure location.
+
+2. **Import the registry keys to the affected server:**
+
+   * Transfer the exported .reg file to the affected server.
+   * Open the Windows Registry Editor on the affected server.
+   * Double-click the .reg file to import the keys. Follow the prompts to confirm the import.
+
+3. **Reboot the server:**
+
+   * Restart the affected server to apply the changes.
+
+4. **Test the connection:**
+
+   * Attempt to connect to the Hyper-V virtual machines using VM Connect to ensure the issue is resolved.
+
+     By completing these steps, the missing TLS cryptography registry keys are restored, enabling the necessary SSL/TLS handshake and resolving the authentication error.
+
+     ## Determine the cause of the problem
+
+     If the issue persists after performing the solution steps, further investigation may be required to confirm if additional configuration settings or system updates are impacting the VM connection process.
+
+     ## Cause 2: Other potential issues
+
+     If the TLS cryptography keys are present and correctly configured, other potential causes, such as network configuration issues or outdated system components, should be examined.
+
+### Solution 2: Verify network and system configurations
+
+1. Check the server's network connectivity to ensure there are no interruptions.
+2. Ensure all system updates and patches are applied to both the host and guest operating systems.
+3. Review event logs for additional error messages that may provide insights into the issue.
+
+     If further assistance is required, consider contacting Microsoft Support for advanced troubleshooting.