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What VPN Client software do you use with a Watchguard IPSec VPN?

On Microsoft Windows computers, the operating system does not include a native IPSec VPN Client that is compatible with the Watchguard IPSec VPN.  On Microsoft Windows computers, you must use a third-party application.  You can use the free and open source Shrew Soft VPN Client Standard for Windows.  When you install the Shrew Soft VPN Client, it defaults to installing the Professional version which requires a charge.  Please select Standard when installing the Shrewsoft VPN Client.

Please Note: It is also possible to use the WatchGuard IPSec Mobile VPN Client software to access the Watchguard IPSec VPN.  However the WatchGuard IPSec Mobile VPN Client is a commercial product that requires a fee.  It is also important to note that you do not want to install both the WatchGuard IPSec Mobile VPN Client and the Shrew Soft VPN Client on the same computer.  If you do so, your LAN connection will fail due to a conflict between the two programs. If this occurs, simply uninstall one of the IPSec VPN Clients and reboot Windows.

On Apple Mac OSX, Apple iOS, Android 4.x and later devices, the operating systems includes a native IPSec VPN Client that is fully compatible with the Watchguard IPSec VPN.

Watchguard Technologies XTM – Port 4100 Unavailable

You may find that Watchguard Technologies VPN Documentation refers to the use of Watchguard Authentication Port 4100 but it does not illustrate this port is Disabled by default nor does it illustrate the method for enabling Watchguard Authentication.&n...