7. Windows XP Firewall

of 5 Oxford University Computing Services Search OUCS Connecting to the Ethernet with Windows XP Home Edition or Professional Full search Feedback 7. Windows XP Firewall oucs >network >ethernet >winxp 1. Introduction 2. Prerequisites 3. Installing the Adapter 4. Installing Ethernet Adapter Driver Software 5. Installing TCP/IP 6. Configuring TCP/IP 7. Windows XP Firewall 7.1. Enabling and Disabling the Firewall 7.2. Opening Ports through the Firewall 8. Troubleshooting TCP/IP 9. WINS Configuration Microsoft have built a firewall into the Windows XP operating system. In certain enabled without you realising. In general, the firewall is enabled, it will help to your PC from the internet. However, because it does block some network traffic stop certain programs working properly. In these circumstances you will either firewall to extra ports, or disable the firewall entirely. Some examples of known problems with the firewall is enabled are as follows. Cannot connect to other computers using the main Exceed program (the Exceed Accessories or HostExplorer tools such as Telnet and Ftp.) If you share directories on your computer, you cannot connect to these d 7.1. Enabling and Disabling the Firewall To check whether the firewall is enabled, go to the [Start] menu and open the [Network Connections] control panel (you may first need to open the [Network category.) Look for your Local Area Connection. If it displays Enabled, Firewalle top right-hand corner of the picture, the firewall is enabled. If it simply says En firewall is disabled. In the picture below, the firewall is enabled. To change whether the firewall is enabled or disabled, select the Local Area C [Properties] from the [File] menu. In the Local Area Connection Properties [Advanced] tab.

of 5 To disable the firewall, turn off the option Protect my computer and network by limiting or preventing access to t to enable it, turn this option on. Then click on OK to close the Properties box. 7.2. Opening Ports through the Firewall If you want to use the firewall, but need to open one or more ports in order to u following procedure. The example shown below opens up the port required in o computer from other computers. Follow the steps in the section above to access the screen used to enable or dis that the firewall is enabled, before clicking on the Settings button.

of 5 At this point you will see a number of predefined services in a list. If any of thes checkbox next to it to enable it. For example, if you want to run an ftp server on Server service included in the list and by enabling this, you will allow people to PCs. However, if there is no service that suits your requirements, you will need to ad Click on Add and fill in the options as shown here.

of 5 Click on OK to add the service. If you need to add any more services, do this in a similar way. For Exceed, gene port 6000 will solve the problem. See the Exceed Configuration pages for more

of 5 As a general rule, when adding a service, you will need to give the following info Description of service: this is simply a name for the service choose so the service does. Name or IP address of the computer hosting this service on your netwo points at your PC. NB if you ever edit a service in the future, you will see replaced by the name of your PC. External Port number for this service: what you put here depends on the you are having problems with a particular program there may be help inf tells you the port that is required. Internal Port number for this service: generally this is set to the same p TCP/UDP option: generally when port numbers are given, they will be gi you should select the appropriate option here. In some cases you may ne ports for the same port number, in which case you will have to add two s Click on OK and then OK again to close the Properties box. Previous: 6. Configuring TCP/ [Style: Simple text Single file Normal XML (experimental)] Users who need any OUCS documents in alternative formats can obt the Help Centre. Date: 18 February 2002 (revised 18/11/2002) Author: Bridget Lewis (revised rahtz). University of Oxford.