You could probably use the interactive serial console to connect to the Special Administrative Console (SAC) of your Windows instance. You can use the SAC to troubleshoot a Windows instance if you can't connect to it via Remote Desktop.
Before you connect, make sure you have created a Windows instance password and have it ready.
To connect to your Windows instance using an interactive serial console through the GCP Console, do the following:
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Open the VM instances page in GCP Console and click the name of your instance. The VM instance details page opens.
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Click Edit. Under Remote access, select Enable connecting to serial ports. This enables the interactive serial console for this instance.
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Click Save, then return to the top of the page.
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Under Remote access, click the drop-down list next to Connect to serial console, and select Serial port 2. A Windows Special Administrative Console (SAC) opens.
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At the SAC> prompt, run cmd to create a new channel. SAC returns the channel name, for example, Cmd001.
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Run ch -sn [CHANNEL_NAME] and press any key to connect to the channel. For example:
SAC> cmd
The Command Prompt session was successfully launched.
SAC>
EVENT: A new channel has been created. Use "ch -?" for channel help.
Channel: Cmd0001
SAC> ch -sn cmd0001
Press any key to confirm connection to the channel.
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Enter the username, domain, and password of the instance to connect.
