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    Failed to connect to a remote computer through Remote Desktop

    Last updated: 2024-01-06 17:32:18
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      Symptom

      When trying to connect to a Windows instance remotely from Windows, you get the following message:
      
      
      The remote desktop can't connect to the remote computer for one of the following reasons:
      1. Remote access to the server is not enabled
      2. The remote computer is turned off
      3. The remote computer is not available on the network
      Make sure the remote computer is turned on and connected to the network, and that remote access is enabled.

      Possible Causes

      Possible causes include but are not limited to the following:
      The instance is in an abnormal status.
      The CVM instance does not have a public IP or the public network bandwidth is 0.
      The remote login port (3389 by default) is not opened in the security group bound to the instance.
      Remote Desktop Services is not started.
      Incorrect Remote Desktop settings
      Incorrect Windows Firewall settings

      Troubleshooting Directions

      Checking instance status

      1. Log in to the CVM console.
      2. On the Instances page, check whether the instance is "Running".
      
      
      If yes, check whether the CVM instance has a public IP.
      If no, start up the Windows instance.

      Checking public IP

      Check whether the CVM instance has a public IP in the CVM console.
      
      
      If yes, check whether you have purchased public network bandwidth.
      If no, apply for an EIP and bind it to the CVM instance.

      Checking public network bandwidth

      Check whether the public network bandwidth is 0 Mbps. At least 1 Mbps of public network bandwidth is required.
      If yes, increase the bandwidth to 5 Mbps or above by adjusting network configuration.
      
      
      If no, check whether the remote login port (3389) of the instance is opened.

      Checking remote login port (3389)

      1. On the instance management page in the CVM console, click the target instance ID/name to enter its details page.
      2. In the Security Groups tab, check whether the remote login port (3389 by default) is opened.
      
      
      If yes, check the remote desktop service.
      If no, edit the corresponding security group rules to open the port as instructed in Adding Security Group Rules.

      Checking remote desktop service

      1. Log in to the instance via VNC and check whether the remote desktop service of the Windows instance is enabled.
      Note:
      The following operations use an instance on Windows Server 2016 as an example.
      2. Right-click
      
      and select System in the pop-up menu.
      3. In the System pop-up window, select Advanced System Settings.
      4. In the System Properties pop-up window, select the Remote tab and check whether the Allow remote connections to this computer is selected:
      If yes, proceed to step 5.
      If no, select it and click OK.
      5.
      Right-click
      
      and select Computer Management in the pop-up menu.
      6. On the left sidebar in the Computer Management window, select Services and Applications > Services.
      7. In the service list on the right, check whether *Remote Desktop Services is started:
      If yes, proceed to step 8.
      If no, start the service.
      8.
      Right-click
      
      and select Run in the pop-up menu.
      9. In the Run pop-up window, enter msconfig and click OK.
      10. In the System Configuration pop-up window, check whether Normal startup is selected:
      If yes, check Windows instance system settings.
      If no, select it and click OK.

      Checking Windows instance system settings

      1. Log in to the Windows instance via VNC and check the system settings of the instance.
      Note:
      The following operations use an instance on Windows Server 2012 as an example.
      2. Right-click
      
      and select Run in the pop-up menu.
      3. In the Run pop-up window, enter services.msc and press Enter to open the Services window.
      4. Double-click to open the Remote Desktop Services properties and check whether Remote Desktop Services is running as shown below:
      
      
      If yes, proceed to step 5.
      If no, set Startup Type to Automatic and Service Status to Running (i.e., clicking Start).
      5. 
      Right-click
      
      and select Run in the pop-up menu.
      6. In the Run pop-up window, enter sysdm.cpl and press Enter to open the System Properties window.
      7. On the Remote tab, check whether the Remote Desktop is set to Allow remote connections to this computer as shown below:
      
      
      If yes, proceed to Step 8.
      If no, set Remote Desktop to Allow remote connections to this computer.
      8. 
      Click
      
      and select Control Panel in the pop-up menu.
      9. In Control Panel, select System and Security > Windows Defender Firewall.
      10. In Windows Defender Firewall, check the Windows Defender Firewall status as shown below:
      
      
      If the status is On, proceed to Step 11.
      If the status is Off, contact submit a ticket for assistance.
      11. 
      In Windows Defender Firewall
      , click Allow an app or feature through Windows Defender Firewall to open the Allowed apps window.
      12. In the Allowed apps window, check whether Remote Desktop is selected in Allowed apps and features.
      
      
      If yes, proceed to Step 13.
      If no, select Remote Desktop to allow Remote Desktop through Windows Defender Firewall.
      13. 
      In Windows Defender
      Firewall, click Turn Windows Firewall on or off to open the Customize Settings window.
      14. In the Customize Settings window, set Private network settings and Public network settings to Turn off Windows Defender Firewall (not recommended) as shown below:
      
      
      If you still cannot connect to the Windows instance on a remote desktop, please submit a ticket for assistance.
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