Microsoft has blocked the downloading of Windows ISO images through third-party utilities.

Microsoft has blocked downloading Windows ISO images via third-party utilities

Users who traditionally downloaded Windows distributions not through the official website, but using third-party tools, have encountered a serious restriction. Microsoft has made changes to the logic of its servers, resulting in the inability to download ISO images through popular utilities.

When attempting to download current Windows 11 builds using various programs, users receive an error with code 715-123130. The system informs that the connection is classified as "anonymous" or insecure, after which the download process is interrupted.

Pete Batard, the developer of the Rufus utility, conducted his own investigation and concluded that the blocking is targeted. According to him, Microsoft specifically updated the server logic to detect and reject requests coming from open scripts and unofficial tools.

For ordinary users, the situation does not seem critical: the official Media Creation Tool and Microsoft website still allow obtaining the distribution without problems. However, in the technical community, third-party utilities were popular due to their functionality. For example, Rufus provided the ability to bypass some restrictions of the official tool—such as TPM 2.0 and Secure Boot requirements when installing Windows 11—and also offered advanced features for creating bootable media. The Fido utility, in turn, could emulate requests so that Microsoft servers perceived them as coming from the official application. Now these functions have stopped working.

A similar situation was observed in 2022 when Microsoft already adjusted protocols, leading to the temporary inoperability of Fido. At that time, developers were able to fix the problem with a patch. However, the current blocking appears more substantial and is likely designed for the long term.

Currently, the direct way to obtain an ISO image is to download it from Microsoft's official website. After that, you can use Rufus to create bootable media in offline mode.

The reasons that prompted Microsoft to make such changes remain a subject of discussion. Among possible explanations are the company's desire to move all users to the official client or measures to combat bots and illegal methods of activating Windows. Official comments from Microsoft on this matter have not yet been received.