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Elastic Compute Service:DescribeInstanceVncUrl

Last Updated:Apr 11, 2024

Queries the Virtual Network Computing (VNC) logon address of an Elastic Compute Service (ECS) instance.

Operation description

Usage notes

Take note of the following items:

  • The keepalive time of a connection to a VNC management terminal is 300 seconds. If you do not interact with the VNC management terminal for 300 seconds, the VNC management terminal is automatically disconnected.

  • If the connection is interrupted, you must recall this operation to obtain a new logon address that is specified by VncUrl and use the new logon address to construct a URL that can be used to reconnect to the VNC management terminal. You can reconnect to a VNC management terminal for a maximum of 30 times per minute.

  • You need to add the vncUrl=\*\*\*\*, instanceId=\*\*\*\*, and isWindows=true/false parameters to the end of the link and use an ampersand (&) between the parameters.

    • vncUrl: the value of VncUrl that is returned after a successful call of this operation.
    • instanceId: the ID of your instance.
    • isWindows: specifies whether the operating system of your instance is Windows. A value of true indicates that the operating system is Windows. A value of false indicates that the operating system is not Windows.
Note You can connect to an instance without a VNC logon password. Therefore, you do not need to configure the password parameter.

Sample URL:****&instanceId=i-wz9hhwq5a6tm****&isWindows=true


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Authorization information

There is currently no authorization information disclosed in the API.

Request parameters


The region ID of the instance. You can call the DescribeRegions operation to query the most recent list of regions.


The ID of the instance


Response parameters


The VNC logon address.

Note **The address returned is valid only for 15 seconds. If a connection is not established within 15 seconds after a successful call, the address expires and you must recall the operation to obtain a new address.

The ID of the request.



Sample success responses


  "VncUrl": "",
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E"

Error codes

HTTP status codeError codeError messageDescription
400InvalidRegionInstanceThe specified InstanceId does not exist in given region.The instance does not exist in the specified region.
403IncorrectInstanceStatusThe current status of the resource does not support this operation.The resource is in a state that does not support the current operation.
403InstanceNotReadyThe specified instance is not ready for useThe specified instance is not available. Check to see if the instance status is preventing this action and try again later.
403InstanceNotReadyTemporarily unable to connect the specified instance,please try later.-
404InvalidRegionId.NotFoundThe specified RegionId does not exist.The specified region ID does not exist.
404InvalidInstanceId.NotFoundThe specified InstanceId does not exist.The specified instance does not exist.
500InternalErrorThe request processing has failed due to some unknown error.An internal error has occurred. Try again later.

For a list of error codes, visit the Service error codes.