Microsoft's October Windows 11 updates have broken the "localhost" functionality, making applications that connect back to 127.0.0.1 over HTTP/2 no longer function properly. [...]
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source https://www.bleepingcomputer.com/news/microsoft/windows-11-updates-break-localhost-127001-http-2-connections/
source https://www.bleepingcomputer.com/news/microsoft/windows-11-updates-break-localhost-127001-http-2-connections/