If you get an error like
Error: listen EADDRINUSE when you attempt to run
harp server -p 80, you probably already have something running on port
Using a different port
The fastest way to fix this is to run Harp on another port, like port
harp server -p 9000
Now, you should be able to access the server via the browser at localhost:9000.
Alternatively, you can stop whatever is already running on port
80 and try again. Running
lsof -i ':80' will list out everything that’s running on port
80—including any websites you have open. There may be one application already there that’s preventing Harp from running, like Apache.
node and Harp that’s listed as already running on port
80, you can stop it by running the following on OS X:
ps -ef | grep harp
This will show you everywhere Harp is running. One line should look something like this:
0 14206 14205 0 2:46pm ttys001 0:00.32 node /usr/local/bin/harp server -p 80
You need the second number on that line. In that example it’s
14206, but it will be something different for you.
sudo kill -9 14206
14206 is replaced with the number you had. That will free up port
80 for you.