![]() The following updates are available from January 17 / 18, 2022: ![]() In the meantime, Microsoft has released Out-of-band updates that are supposed to fix this IPSec VPN bug. ![]() Out-of-band updates to fix the IPSec VPN problem The only remedy was to uninstall the updates in question. Windows versions were affected as soon as the following security updates were installed. Users who relied on Windows' IPSec VPN connections could no longer reach Cisco Meraki MX appliances, Ubiquiti or Mikrotik and Fortigate gateways, and SonicWall instances. VPN connections using Layer 2 Tunneling Protocol (L2TP) or IP security Internet Key Exchange (IPSEC IKE) might also be affected. IP Security (IPSEC) connections which contain a Vendor ID might fail. Microsoft confirmed the problem and wrote: It didn't matter whether Layer 2 Tunneling Protocol (L2TP) or IP security Internet Key Exchange (IPSEC IKE) were used (see Windows VPN connections (L2TP over IPSEC) broken after January 2022 update). After installing the security updates released on January 11, 2022, numerous users complained that IPSec VPN connections could no longer be established with on-board means under Windows.
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