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Step 2: Click Virtual Server and Add Rule 
 
 
 
Step 3: Create your rule (FTP server as example), then apply 
- Name- Enter a name for the rule (i.e. Web Server 1) 
- Local IP: Specify the IP address of the device you are opening the port for 
- Protocol: Specify the traffic type (TCP or UDP) - Note: If you are not sure, choose BOTH 
- External/Internal Port: Enter the port number you want to open (i.e. 21, for FTP)