If you cannot use remote connection software such as RDP and rdesktop to connect to a Windows instance, you can use the VNC Connection feature in the console to log on to the instance and view the real-time status of the instance operating interface.
Prerequisites
Background information
- VNC password: the password of management terminals used to connect to the ECS console.
- Instance logon password: the password used to log on to the instance operating system.
By default, a remote VNC connection session lasts for about 300 seconds. If you do not perform operations within these 300 seconds, the connection to the instance is disconnected. You must connect to the instance again.
If you cannot use remote connection software to connect to your instance, you can use the VNC Connection feature in the ECS console to connect to the instance and view the status of the instance. The following table describes the related scenarios.
Scenario | Solution |
---|---|
The instance starts slowly due to self-check on startup. | Check the self-check progress. |
The firewall of the operating system is enabled by mistake. | Disable the firewall. |
The ECS instance is hacked into, which causes a high CPU utilization and high bandwidth usage. | Troubleshoot and terminate abnormal processes. |
Procedure

Change the VNC password
Copy long commands
If you want to copy a long-text item such as a download URL from your computer to the instance, you can use the command copy feature.
- On the Instances page, find the instance to be connected and click Connect in the Actions column.
- Connect to a VNC management terminal.
- In the upper-left corner of the interface, click Enter Copy Commands.
- In the Copy and Paste Commands dialog box, enter the content to be copied and click OK.
References
If you want to adjust the resolution of the Windows desktop, see How do I adjust the desktop resolution of a Windows instance?.