Officially, the last stable release of Shrew Soft (version 2.2.2, dated 2013) was designed for Windows 7, 8, and Server 2008 R2. However, many users have successfully run it on Windows 10 and Windows 11 using compatibility tweaks.
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If your VPN server supports IKEv2, migrate to Windows 11’s native VPN client. It’s more secure, faster, and requires no third-party drivers. Final Verdict: Should You Use Shrew Soft on Windows 11? Yes, if you have a legacy IPsec IKEv1 gateway (e.g., an old Cisco ASA, SonicWall TZ, or pfSense 2.4) and no budget for upgrades. Many industrial control systems, retail back-office VPNs, and government networks still rely on such setups. Officially, the last stable release of Shrew Soft (version 2