Known problem: Google Antigravity sign-in fails or not sending prompts with KESWin turned on
Description
Google Antigravity might be unable to sign in with Google account when KES for Windows Web Threat Protection and Encrypted connections scan are functioning on the host. No specific error, just nothing happens after pressing Open Antigravity.
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Additionally, if sign in was successful, projects might be not loaded properly:
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Reason
antigravity.exe doesn't accept KES certificate, and sign-in fails.
When opening projects, connection from localhost to localhost is established, but the server side stops sending data. KES doesn't block it, only holds.
Workaround and solution
Add the below applications as Trusted to prevent KES from processing their traffic with option Do not scan network traffic:
C:\Users\*\AppData\Local\Programs\Antigravity\Antigravity.exe
C:\Users\*\AppData\Local\Programs\Antigravity\resources\app\extensions\antigravity\bin\language_server_windows_x64.exe
C:\Users\*\AppData\Local\Programs\Antigravity IDE\resources\app\extensions\antigravity\bin\language_server_windows_x64.exe
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