Microsoft confirmed problems affecting browser performance on Windows 11 after a recent update and decided to roll back that update to prevent further user disruption. The move underscores how even essential software components can encounter compatibility gaps, and it shows the caution companies exercise to protect users while a fix is prepared.
The root of the problem lies with the eSCL protocol, which does not function as intended on Windows 11 version 24H2. Because of this, the update that included the related components was blocked to stop widespread impact while Microsoft works on a resolution.
Microsoft explained that the core cause is an inability of devices to switch from eSCL mode back into USB mode after eSCL has been engaged.
After installing Windows 11 version 24H2, users may experience difficulty detecting USB devices that support the eSCL scanning protocol. The connected USB device may fail to be recognized. The effect is most pronounced on USB-connected multifunction printers or standalone scanners that provide scanning capabilities via the eSCL protocol.
eSCL is a protocol designed for scanners that allows document scanning without the need to install separate drivers. It supports both network scanning and USB scanning, offering flexible options for different setups. The issue arises because the device cannot transition from eSCL mode back to USB mode, leaving scanning operations in a kind of limbo.
To manage the situation, a recall mechanism is monitoring affected Windows 11 installations and their connected devices, with ongoing oversight to guide users and inform partners about status and potential mitigations.