Windows provides a built-in firewall, which controls how programs access the Internet. If Windows Firewall doesn't permit Firefox to make connections, Firefox generates a "''Server not found''" error when you try to browse to websites. __TOC__ = Windows 7 = == Checking for Windows 7 Firewall == To see if you're running Windows Firewall: # Click the Windows icon, and select {button Control Panel}. The Control Panel window will appear. # Click on '''System and Security'''. The System and Security Panel will appear. <br/> <br/>[[Image:459f1878e6a7ea0c95079f93f7106b9d-1256783860-179-1.png]] <br/> # Click on '''Windows Firewall'''. The Windows Firewall panel will appear. <br/> <br/> [[Image:459f1878e6a7ea0c95079f93f7106b9d-1256784141-862-1.png]] <br/> # If you see a green check mark, you are running Windows Firewall. <br/> <br/> [[Image:459f1878e6a7ea0c95079f93f7106b9d-1256783860-179-3.png]] <br/> == Configuring Windows 7 Firewall == If you're running Windows Firewall and having connection problems in Firefox: # On the left side of the Windows Firewall panel, click the '''Allow a program or feature through Windows Firewall'''. The Allowed Programs panel will appear. <br/> <br/>[[Image:459f1878e6a7ea0c95079f93f7106b9d-1256783371-733-4.png]] <br/> # Click the {button Change Settings} button. <br/> <br/>[[Image:459f1878e6a7ea0c95079f93f7106b9d-1256783371-733-5.png]] <br/> # Find '''Mozilla Firefox''' in the list of programs. If it is there, click to select it. If not, skip the next step. # With '''Mozilla Firefox''' (or '''firefox.exe''') selected, click the {button Remove} button. Confirm that you want to remove the entry. # After removing the Mozilla Firefox entry, click the {button Allow another program...} button. The Add a Program window will appear. <br/> <br/>[[Image:459f1878e6a7ea0c95079f93f7106b9d-1256783371-733-6.png]] <br/> # In the Add a Program window, click the {button Browse...} button. # Navigate to the Firefox program directory (e.g. {filepath C:\Program Files\Mozilla Firefox\}) and double-click on '''firefox'''.exe. # Click the {button Add} button. # Click the {button OK} button to close the Allowed Programs panel. = Windows Vista = == Checking for Windows Vista Firewall == To see if you're running Windows Firewall: # Click the Windows icon, and select {menu Control Panel}. The Control Panel window will appear. # Click on the '''System''' header. The Security Panel will appear. # Click on the '''Windows Firewall''' header. The Windows Firewall panel will appear. # If you see a green check mark and the message '''Windows Firewall is helping to protect your computer''', you are running Windows Firewall. == Configuring Windows Vista Firewall == # On the left side of the Windows Firewall panel, click the '''Allow a program or feature through Windows Firewall'''. The Windows Firewall Settings window will appear. # Find '''Mozilla Firefox''' (or '''firefox.exe''') in the list of programs. If it is there, click to select it. If not, skip the next step. # With '''Mozilla Firefox''' selected, click the {button Delete} button. Confirm that you want to delete the entry. # After removing the Mozilla Firefox entry, click the {button Add program...} button. The Add a Program window will appear. # In the Add a Program window, click the {button Browse...} button. # Navigate to the Firefox program directory (e.g. {filepath C:\Program Files\Mozilla Firefox\}) and double-click on '''firefox'''.exe. # Click the {button OK} button to close the Add a Program window. # In the Windows Firewall Settings window, click to select the '''General''' tab. # Ensure that '''Block all incoming connections''' is not selected. # Click the {button OK} button to close the Windows Firewall Settings window. = Windows XP = == Checking for Windows XP Firewall == To see if you're running Windows Firewall: # Click on the Windows Start button, and select {menu Control Panel}. The Control panel window will appear. # Click on the '''Security Center''' link. The Security Center will appear. # If the '''Firewall''' header says '''ON''', you are running Windows Firewall. == Configuring Windows XP Firewall == If you're running Windows Firewall and having connection problems in Firefox: # Click on the Windows Start button, and select {menu Control Panel}. The Control panel window will appear. # Click on the '''Security Center''' link. The Security Center will appear. # If the '''Firewall''' header says '''ON''', you are running Windows Firewall. # Ensure that '''Don't allow exceptions''' is not selected. # Click to select the '''Exceptions''' tab. # Find '''Mozilla Firefox''' (or '''firefox.exe''') in the list of programs. If it is there, click to select it. If not, skip the next step. # With '''Mozilla Firefox''' selected, click the {button Delete} button. Confirm that you want to delete the entry. # Click the {button Add Program...} button. # In the Add a Program window, click the {button Browse...} button. # Navigate to the Firefox program directory (e.g. {filepath C:\Program Files\Mozilla Firefox\}) and double-click on '''firefox'''.exe. # Click the {button OK} button to close the Add a Program window. # Click the {button OK} button to close the Windows Firewall Settings window. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Firewalls Firewalls (mozillaZine KB)]'''''

Windows provides a built-in firewall, which controls how programs access the Internet. If Windows Firewall doesn't permit Firefox to make connections, Firefox generates a "Server not found" error when you try to browse to websites.

Windows 7

Checking for Windows 7 Firewall

To see if you're running Windows Firewall:

1. Click the Windows icon, and select Control Panel. The Control Panel window will appear.
2. Click on System and Security. The System and Security Panel will appear.
   
   
   
3. Click on Windows Firewall. The Windows Firewall panel will appear.
   
   
   
4. If you see a green check mark, you are running Windows Firewall.
   
   
   

Configuring Windows 7 Firewall

If you're running Windows Firewall and having connection problems in Firefox:

1. On the left side of the Windows Firewall panel, click the Allow a program or feature through Windows Firewall. The Allowed Programs panel will appear.
   
   
   
2. Click the Change Settings button.
   
   
   
3. Find Mozilla Firefox in the list of programs. If it is there, click to select it. If not, skip the next step.
4. With Mozilla Firefox (or firefox.exe) selected, click the Remove button. Confirm that you want to remove the entry.
5. After removing the Mozilla Firefox entry, click the Allow another program... button. The Add a Program window will appear.
   
   
   
6. In the Add a Program window, click the Browse... button.
7. Navigate to the Firefox program directory (e.g. C:\Program Files\Mozilla Firefox\) and double-click on firefox.exe.
8. Click the Add button.
9. Click the OK button to close the Allowed Programs panel.

Windows Vista

Checking for Windows Vista Firewall

To see if you're running Windows Firewall:

1. Click the Windows icon, and select Control Panel. The Control Panel window will appear.
2. Click on the System header. The Security Panel will appear.
3. Click on the Windows Firewall header. The Windows Firewall panel will appear.
4. If you see a green check mark and the message Windows Firewall is helping to protect your computer, you are running Windows Firewall.

Configuring Windows Vista Firewall

1. On the left side of the Windows Firewall panel, click the Allow a program or feature through Windows Firewall. The Windows Firewall Settings window will appear.
2. Find Mozilla Firefox (or firefox.exe) in the list of programs. If it is there, click to select it. If not, skip the next step.
3. With Mozilla Firefox selected, click the Delete button. Confirm that you want to delete the entry.
4. After removing the Mozilla Firefox entry, click the Add program... button. The Add a Program window will appear.
5. In the Add a Program window, click the Browse... button.
6. Navigate to the Firefox program directory (e.g. C:\Program Files\Mozilla Firefox\) and double-click on firefox.exe.
7. Click the OK button to close the Add a Program window.
8. In the Windows Firewall Settings window, click to select the General tab.
9. Ensure that Block all incoming connections is not selected.
10. Click the OK button to close the Windows Firewall Settings window.

Windows XP

Checking for Windows XP Firewall

To see if you're running Windows Firewall:

1. Click on the Windows Start button, and select Control Panel. The Control panel window will appear.
2. Click on the Security Center link. The Security Center will appear.
3. If the Firewall header says ON, you are running Windows Firewall.

Configuring Windows XP Firewall

If you're running Windows Firewall and having connection problems in Firefox:

1. Click on the Windows Start button, and select Control Panel. The Control panel window will appear.
2. Click on the Security Center link. The Security Center will appear.
3. If the Firewall header says ON, you are running Windows Firewall.
4. Ensure that Don't allow exceptions is not selected.
5. Click to select the Exceptions tab.
6. Find Mozilla Firefox (or firefox.exe) in the list of programs. If it is there, click to select it. If not, skip the next step.
7. With Mozilla Firefox selected, click the Delete button. Confirm that you want to delete the entry.
8. Click the Add Program... button.
9. In the Add a Program window, click the Browse... button.
10. Navigate to the Firefox program directory (e.g. C:\Program Files\Mozilla Firefox\) and double-click on firefox.exe.
11. Click the OK button to close the Add a Program window.
12. Click the OK button to close the Windows Firewall Settings window.

Based on information from Firewalls (mozillaZine KB)