ZyXEL Communications ZyWALL Troubleshooting Manual page 3

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Scroll down the list to find the 'IKE and AuthIP IPsec Keying
Modules' and 'IPsec Policy Agent' to restart these services.
 Please check your L2TP clients settings against our setup
example(s)
 Disable your computers firewall to make sure it is not blocking the
VPN connection attempt.
Windows:
box. You can access this by pressing the Windows + R keys on the
keyboard.
[link to Windows, macOS, iOS, etc., setup guides]
To disable the Windows firewall, open a RUN dialog
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