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A "Server not found" error can be caused by Windows Firewall blocking Firefox from accessing the Internet. Learn how to configure it to allow Firefox access.

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. {for mac,linux} {note}'''Note:''' This article only applies to Windows. To see instructions, choose the Windows version from the dropdown menu above. {/note} {/for} {for win} __TOC__ {for win8} = Checking for Windows 8 Firewall = To see if you're running Windows Firewall: # From the Start Screen, click the '''Desktop''' tile. The Desktop view will open. # From the Desktop, hover in the lower right-hand corner to access the Charms. # Select {menu Control Panel} from the {menu Settings} charm. The Control Panel window will open. #:<br>[[Image:Control Panel - Win8]] # 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 8 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. {/for} {for win7} = 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. #:[[Image:Control Panel - Win7]] # 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 == 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 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. {/for} {for winxp} = 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. #:[[Image:Control Panel - WinXP]] # Click on the '''Security Center''' link. The Security Center will appear. #:<br>[[Image:Security Center - WinXP]] # If the '''Firewall''' header says '''ON''', you are running Windows Firewall. #:<br>[[Image:Firewall ON - WinXP]] = Configuring Windows XP Firewall = If you're running Windows Firewall and having connection problems in Firefox: # [[#w_checking-for-windows-xp-firewall|Check Windows Firewall is ON]]. # In the Security Center, click Windows Firewall. The Windows Firewall window will open. # Select the '''Exceptions''' tab. #:<br>[[Image:Firewall Exceptions - WinXP]] # 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. {/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Firewalls Firewalls (mozillaZine KB)]''''' {/for} [[Template:ShareArticle|link=http://mzl.la/LN6Gd4]]