Networking :: Open a port for web server

I installed Abyss web server, but it has a listening problem because the port I need is not open. I need to open/enable port 81, how do I go about doing this?

Typically the web software opens and starts listening on the port it uses. From DSL you can type netstat -l to see if the port is open on the DSL side.

However, if your ISP blocks this port, or if you are behind a firewall/router. Then you would need to enter the parameters to open up such a port.

Is your question is specific to a router or firewall?

i'm behind a router. the server program was config'd to listen to port 81, since 80 is blocked by isp. But when I open the gui for the server, is says it cant listen to port 81. When I type netstat -l, there are no ports open.

Is the server supposed to be started as root?
Make sure the user is set to nobody in the config file.

the server runs as user instead of root. I've gone through the config file and didn't see anything about the user.

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