Instance which guest OS is Windows Server hangs when detaching an interface while the instance is online.
When detaching an interface of an instance which guest OS is Windows Server, the instance rarely hang if the instance is online.
In this case, you can not use the Web console or operate via the API for that instance.
In this case, you can not use the Web console or operate with the Cloud Computing Control Panel or API for that instance.
In order to avoid this issue, please detach an interface after turning off an instance.
If the instance hangs up after detaching an interface, please inquire with a ticket.