Wi-Fi or VPN not connecting after the October 2026 Windows update: NTLMv1 fix
The October 13, 2026 Windows update blocks NTLMv1-derived single sign-on by default, breaking PEAP-MSCHAPv2 Wi-Fi and VPN logins. Here is how to confirm it and fix it.
Windows Server
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Exchange OWA not working after the October 2026 Windows update: fix
OWA sign-in failures and emails stuck in the Outbox after the October 2026 Windows Server update come from a new Endpoint Mapper limit. Here is Microsoft’s workaround.
