To permit and direct incoming traffic from the Internet to a specific computer and/or servers inside your internal network with a specific service, you have to define an object that will represent the Server.
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With a web browser, connect to the appliance Web interface and log in.
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From the left navigation panel, click Access Policy > Servers (in the Firewall section)

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Click * New.
The New Server Wizard opens.
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Configure the server type and click Next:
There are 5 common built-in server types: Mail, DNS, Web Server, FTP, and Citrix Server.
If you want to create a custom server, select only the Other server option and configure the required settings.

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Configure the server definitions and click Next:
- In the Name field, enter the object name
- In the IP address field, enter the IPv4 address of the server
- In the Comments field, enter the object description (optional)
- Select the applicable options (see the Administration Guide for your version)

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Configure the server access settings and click Next:
Select the applicable zones to create the corresponding Access policy rule.
Configure the applicable ping and logging options (see the Administration Guide for your version).

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Configure the server NAT settings and click Finish:
To configure port forwarding:
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Select either Hide Behind Gateway or Static NAT
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Select Redirect from port
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Enter the port, on which the appliance needs to listen to the incoming traffic

For more information, refer to the Administration Guide for your version > section Defining Server Objects.