Microsoft says that current Home windows 11 safety updates are inflicting VPN networking failures for enterprise customers working Home windows Subsystem for Linux.
This recognized challenge impacts customers who put in the KB5067036 October 2025 non-security replace, launched October twenty eighth, or any subsequent updates, together with the KB5072033 cumulative replace launched throughout this month’s Patch Tuesday.
On impacted methods, customers are experiencing connectivity points with some third-party VPN functions when mirrored mode networking is enabled, stopping entry to company sources.
Mirrored mode networking was launched in WSL in September 2018 to enhance VPN compatibility, add IPv6 and multicast assist, and allow connecting to WSL from the native space community (LAN) and to Home windows servers from inside Linux.
These affected by this bug are seeing “No path to host” errors in WSL environments, though their Home windows host methods can usually entry the identical locations. Based on Microsoft, the issue impacts OpenVPN and enterprise VPN options, akin to Cisco Safe Consumer (previously Cisco AnyConnect).
The difficulty stems from VPN functions’ digital community interfaces failing to answer Handle Decision Protocol (ARP) requests, which map IP addresses to MAC (Media Entry Management) addresses.
“This challenge occurs as a result of the VPN utility’s digital interface does not reply to ARP (Handle Decision Protocol) requests,” Microsoft stated. “House customers of Home windows House or Professional editions are unlikely to expertise this challenge. It primarily impacts connectivity to enterprise sources over VPN, together with DirectAccess.”
Microsoft says it is investigating this recognized challenge however has but to supply a timeline for a repair or a workaround, and added that further data could be shared when accessible.
WSL was launched in March 2018 as a compatibility layer that permits customers to run Linux distributions natively on their Home windows computer systems through PowerShell or the Home windows 10 command immediate.
In Could 2019, Microsoft launched WSL 2, a significant improve together with a actual Linux kernel working in a digital machine, notable enhancements in file-system efficiency, and prolonged assist for full system-call compatibility.
Microsoft open-sourced WSL at Microsoft Construct 2025, making its supply code accessible on GitHub, aside from a handful of parts which are a part of Home windows.
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