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As you can see, netstat provides a complete overview of what s happening on your server. It s especially useful if you get error messages like port already in use. In combination with the grep utility, it s easy to learn what port program is currently holding a port open and, if required, to terminate that program. For example, to find out what program is currently occupying port 80, use netstat -platune | grep 80. This returns a line like root@ZNA:~# netstat -platune | grep 80 tcp 0 0 0.0.0.0:80 0.0.0.0:* 13209 3965/apache2 LISTEN 0\

Figure 7-6. Ubuntu is able to join WPA-protected wireless networks. When you re finished, click the Connect button. You should see the NetworkManager icon start to animate as the program attempts to connect and find an IP address. After a few seconds, when the animation finishes and the icon switches to display signal strength, you should find yourself online. If your computer doesn t seem to connect, try rebooting. If the hardware doesn t work after this, it might be that the drivers Ubuntu installed by default are incompatible with your network device. In this case, you can try using a Windows wireless network device driver, as described in the next section. Should you find yourself in the unusual situation of needing to specify the IP address, subnet mask, and gateway for a wireless connection, you can do so using the manual configuration mode of NetworkManager, as outlined in the Configuring an Ethernet Network Device section earlier in this chapter. Simply follow the instructions in that section, but select the Wireless Connection entry in the list rather than Wired Connection. In the dialog box that appears, you ll see additional areas for entering your SSID and WEP/WPA protection details.

Most wireless networks are protected using either the Wired Equivalent Privacy (WEP) or Wi-Fi Protected Access (WPA) systems WPA is effectively an updated version of WEP and offers much stronger protection There are two versions of WPA: WPA and WPA2 WPA2 is newer and corrected several security flaws in WPA Both work in roughly the same way WEP and WPA encrypt the data being transmitted on the network, the idea being that it cannot be stolen by crackers with special equipment Also, people can t join the wireless network unless they know the encryption key, which is basically an access code or password that prevents unauthorized people from accessing the network As with other situations where security is important, you should choose a strong password containing letters of both cases, punctuation, and numbers.

From this line, you can see that an Apache web server with a PID of 3965 is currently listening on port 80. Want to remove it Use kill 3965 and it s gone.

We can also sort the output by the aggregate. If we wanted to see results in descending order of the number of tournaments entered, we could add an ORDER BY COUNT(*) DESC clause at the end of Listing 8-26.

Of the two, you should ideally configure your wi-fi base station to use WPA, because, sadly, WEP can be compromised within 5 minutes by using easily available software However, the situation isn t quite so clear-cut for some Ubuntu users Not all of Ubuntu s built-in wi-fi drivers support WPA Some might claim to support it, but you might find they don t work reliably Unfortunately, the only way you will be able to find out whether this is the case for you is to try to configure your network device and see what happens If you fall into the camp of not having good WPA support on your Ubuntu PC (and only a small percentage of users will), you might find WEP is your only reliable option, and you might therefore need to reconfigure your base station to use it.