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Firefox can't establish a connection...


I have been receiving the error "Firefox can't establish a connection to the server at..." for a URL that works fine in Firefox on a Windows 2000 PC Cable connected to the router but the Firefox on the Windows XP PC Wireless connected gives the error for the same router.

McAfee Firewall 'Net Guard' on the XP PC was the issue. I changed Action - 'Block' to 'Allow' for the IP address and now both PCs can access the site.

Additional System Details

Sites Affected


Installed Plug-ins

  • Foxit Reader Plug-In For Firefox and Netscape
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • McAfee MSC FF plugin DLL
  • VLC media player Web Plugin 2.0.0
  • Shockwave Flash 10.3 r183
  • Version 1.1.9, copyright 1996-2011 The VideoLAN Teamhttp://www.videolan.org/
  • IE Tab Plug-in for Mozilla/Firefox
  • BrowserPlus -- Improve your browser! -- http://browserplus.yahoo.com/
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • LogMeIn, Inc. Remote Access Components
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • DRM Netscape Network Object
  • DRM Store Netscape Plugin
  • Npdsplay dll
  • npunagi2
  • Package Installer & Install Conduit


  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:10.0.1) Gecko/20100101 Firefox/10.0.1

More Information

Can someone tell me how Net Guard decides what to block?
Do I really increase my risk level if I just turn it 'off' by removing the check mark?

Question owner

Managed to loose the rest somehow.

Can someone tell me how Net Guard decides what to block?

Also will I increase my risk greatly if I simply remove the check and turn 'off' Net Guard?

There were only three blocked entries in the list.

okumar002 0 solutions 1 answers

Clearing the Cache and removing Cookies is only a temporary solution. Restart the computer and the problem persists. PHP web development company