ZyXEL Communications ZyWall ATP series - What Could Go Wrong

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Go to the ZyWALL/USG Monitor > Log, you will see [notice] log message shown as
below. The access to FTP service port 21 is blocked in this example.
Monitor > Log
What Could Go Wrong?
If you see [notice] log shown as below, the Wi-Fi guest traffic is blocked by the
priority 1 Security Policy. The ZyWALL/USG checks the security policy in order and
applies the first security policy to the matched traffic. If the Wi-Fi guest traffic
matches a policy that comes earlier in the list, it may be unexpectedly blocked.
Please change your policy setting or move the Wi-Fi guest policy to the higher
priority.
Monitor > Log