Before you can enable the WAN Firewall you must have configured a "Remote Site" profile in your router.

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Select the following menu options:

Configuration / Applications set-up / Firewall Set-up / WAN Firewall set-up

You will be prompted to enter the name of your Remote Site configuration to be associated with this firewall entry.

Change the "Firewall" option to "inbound".

Select the "Edit firewall entry" menu. You will be prompted to enter a Firewall filter id as shown below.

Enter 1 to represent the first firewall filter for this Remote Site profile.

Change the Firewall entries as shown:

1. Destination addr [all] - Destination IP address of frame
2. Destination mask [none] - Network mask for dest address
3. Source address [all] - Source IP address of frame
4. Source mask [none] - Network mask for source address
5. Protocol type [all] - Allow specific protocol types
6. Source port [0] [22] - Source port range to allow
7. Destination port [0] [22] - Destination port range to allow
8. Description "Manual entry" - Describe the entry
9. Entry direction [inbound] - Direction this entry applies to

Press the TAB key.

Select the "Edit firewall entry menu" again. You will be prompted to enter the firewall filter id as shown below.

Enter 2 to represent the second firewall filter for this Remote Site profile.

Change the Firewall entries as shown:

1. Destination addr [all] - Destination IP address of frame
2. Destination mask [none] - Network mask for dest address
3. Source address [all] - Source IP address of frame
4. Source mask [none] - Network mask for source address
5. Protocol type [all] - Allow specific protocol types
6. Source port [24] [65535] - Source port range to allow
7. Destination port [24] [65535] - Destination port range to allow
8. Description "Manual entry" - Describe the entry
9. Entry direction [inbound] - Direction this entry applies to

Press the = key.

Select the "Save Configuration" option.
Select "Diagnostics" option, then select "Soft reset".