swat is an xinetd service. You must enable swat to be used. It is in the scheme of apps that are considered "Unsafe" since the data passed is in clear text. These include telnet, rlogin etc.
I do not know what distro you are using, but typically from the text mode you can cd to /etc/xinetd.d directory and edit the file in there named swat. It probably has a line that reads disable = yes. Either change it to no or comment out the line. Save the file and then restart the xinetd daemon.
/etc/init.d/xinetd restart
You should be good to go.
On some distros, this swat entry may be in the /etc/ineetd file, but usually it will be in the directory I mentioned.
If you are using Red Hat (yuk!) in xwindows you can issue serviceconf and turn swat on in the GUI. From the black screen you can issue ntsysv and turn it on there. Don't forget to restart the xinetd daemon.
On SuSe, everything is done using Yast.
I suggest if you are new to the system that you visit
www.webmin.com and download it. It is a great weeb based administration tool that will include tools for setting up swat, apache, ftp, well, basically everything!
Tony