In the United States, a small number of individuals continue to rely on traditional dial-up modems for internet access. These users are often elderly residents in isolated locations where broadband options remain scarce or costly. Microsoft's latest Windows 11 update in January 2026 has, however, introduced an unwelcome change for this group.
Following the installation of this patch, dial-up modems can stop operating entirely. According to coverage from Windows Central, the KB5074109 release has disrupted functionality across multiple modem models simultaneously.
What sets this issue apart is that it stems from a deliberate decision rather than an unintended glitch, unlike some other glitches in the same update. Microsoft's documentation for the release states that the patch eliminates specific driver components deemed insecure due to unresolved security flaws. The company recommends that users upgrade to newer modem hardware to resolve the problem.
Many legacy modems depend on these now-removed drivers to operate, and the change could also impact certain recently acquired models, including ones currently sold in the American market.
User reports of failing modems are increasing on Microsoft's support communities and platforms such as Tom's Hardware. These devices often serve practical roles in small businesses, like handling incoming calls or recording operational data.
While no single modem brand appears disproportionately impacted, the update specifically targeted and deleted a set of outdated driver packages previously supported by the system.
Compounding the issue, modem producers claim they received no prior notification from Microsoft about the forthcoming changes, leaving them without time to develop patches or alternative solutions for affected customers.
For those experiencing disruptions who require immediate modem restoration, the sole current option involves removing the KB5074109 update. Afterward, it's advisable to turn off automatic update features to prevent reapplication. Keep in mind, though, that this patch addresses security risks, so reverting it exposes systems to ongoing vulnerabilities.