X
Tap here to go to the mobile version of the site.

Support Forum

Firefox is configured to use a proxy server that is refusing conections-- why does this happen suddenly in the middle of a session?

Posted

Using a Dell Inspiron laptop, Windows 8 64-bit, have made no changes or downloaded new programs yet in the middle of a session, as I went from one site to the next, this message appeared. I finally figured out how to get to "tools" then "network settings" and check "no proxy", but will this fix the problem? It happened before and I performed a system recovery, which also worked, but it was a huge hassle.

Using a Dell Inspiron laptop, Windows 8 64-bit, have made no changes or downloaded new programs yet in the middle of a session, as I went from one site to the next, this message appeared. I finally figured out how to get to "tools" then "network settings" and check "no proxy", but will this fix the problem? It happened before and I performed a system recovery, which also worked, but it was a huge hassle.

Additional System Details

Installed Plug-ins

  • npsitesafety (Official)
  • Shockwave Flash 13.0 d0
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.06
  • Next Generation Java Plug-in 10.51.2 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • McAfee MSC FF plugin DLL
  • 5.1.20913.0
  • McAfee MSS+ NPAPI Plugin
  • NPWLPG
  • Intel web components for Intel® Identity Protection Technology
  • Intel web components updater - Installs and updates the Intel web components

Application

  • Firefox 27.0
  • User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0
  • Support URL: https://support.mozilla.org/1/firefox/27.0/WINNT/en-US/

Extensions

  • Adblock Plus 2.4.1 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • AVG SafeGuard toolbar 17.3.1.91 (avg@toolbar)
  • IObit Apps Toolbar 8.6 (iobitapps@mybrowserbar.com)
  • Start Page 2.0 ({58d2a791-6199-482f-a9aa-9b725ec61362})
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Ads Removal 1.0.0 (adsremoval@adsremoval.net) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: Intel(R) HD Graphics 4000
  • adapterDescription2:
  • adapterDeviceID: 0x0166
  • adapterDeviceID2:
  • adapterDrivers: igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.2.9200.16581
  • driverDate: 9-2-2012
  • driverDate2:
  • driverVersion: 9.17.10.2849
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'direct2d', u'AzureSkiaAccelerated': 0}
  • isGPU2Active: False
  • numAcceleratedWindows: 2
  • numTotalWindows: 2
  • webglRenderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D9Ex vs_3_0 ps_3_0)
  • windowLayerManagerRemote: False
  • windowLayerManagerType: Direct3D 10

Modified Preferences

  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.cache.memory.capacity: 65536
  • browser.display.show_image_placeholders: True
  • browser.places.smartBookmarksVersion: 4
  • browser.sessionstore.max_tabs_undo: 0
  • browser.sessionstore.max_windows_undo: 0
  • browser.sessionstore.resume_from_crash: False
  • browser.sessionstore.upgradeBackup.latestBuildID: 20140127194636
  • browser.startup.homepage_override.buildID: 20140127194636
  • browser.startup.homepage_override.mstone: 27.0
  • browser.urlbar.autocomplete.enabled: True
  • extensions.lastAppVersion: 27.0
  • gfx.direct3d.last_used_feature_level_idx: 0
  • keyword.URL: http://search.yahoo.com/search?ei=utf-8&fr=greentree_ff1&type=402027&ilc=12&p=
  • network.cookie.prefsMigrated: True
  • network.http.max-connections: 48
  • network.http.max-connections-per-server: 16
  • network.http.max-persistent-connections-per-proxy: 16
  • network.http.max-persistent-connections-per-server: 8
  • network.http.pipelining.maxrequests: 8
  • network.http.request.max-start-delay: 0
  • places.database.lastMaintenance: 1391486283
  • places.history.expiration.transient_current_max_pages: 104858
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.expose_full_path: True
  • plugin.importedState: True
  • privacy.donottrackheader.enabled: True
  • privacy.sanitize.migrateFx3Prefs: True

Misc

  • User JS: Yes
  • Accessibility: No
cor-el
  • Top 10 Contributor
  • Moderator
17580 solutions 159053 answers

Helpful Reply

Which security software (firewall, anti-virus) do you have?


You can check the connection settings.

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

Which security software (firewall, anti-virus) do you have? ---- You can check the connection settings. *Tools > Options > Advanced > Network : Connection > Settings *https://support.mozilla.org/kb/Options+window+-+Advanced+panel If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly. See "Firefox connection settings": *https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can

Question owner

Thanks for your reply. :)

I use Windows firewall and iObit's Advanced System Care Ultimate plus their malware program.

I had difficulty locating "tools". I finally went to the orange "Firefox" box at the top left of my screen and clicked Options>Network, Connection Settings where I saw options of "No Proxy", "Auto Detect Proxy Settings", "Use System Proxy Settings" (this one was checked), and "Manual Proxy Configuration".

The problem is, I have no idea what a proxy setting is and have never messed around with these. Is the correct one selected?

And, in probably a related issue, I was unable to even access the Firefox home page this morning, although the internet indication in the lower right corner of my screen was white (indicating an active internet connection). When I clicked on the Firefox logo on the desktop and on the tray, I got the message: Program Files (x86)\Mozilla Firefox\firefox.exe Class Not Registered

I went to my Program Files, clicked on Mozilla Firefox, and clicked on the Firefox logo. Lo and behold, the page opened and I was able to access websites.

I need to tell you that I am not very tech-oriented. I do try to keep my laptop current with updates and backups, but the technicalities of anything more really confuses me. If you have any advice about either issue, I would really, really appreciate it.

And, do I need a proxy? As I understand from what I have read, since I have only one computer (laptop) and I don't share an internet connection (except when I use my kindle to go online), I don't need one and perhaps I should check the "no proxy" option.

Thanks so much for your help!

Thanks for your reply. :) I use Windows firewall and iObit's Advanced System Care Ultimate plus their malware program. I had difficulty locating "tools". I finally went to the orange "Firefox" box at the top left of my screen and clicked Options>Network, Connection Settings where I saw options of "No Proxy", "Auto Detect Proxy Settings", "Use System Proxy Settings" (this one was checked), and "Manual Proxy Configuration". The problem is, I have no idea what a proxy setting is and have never messed around with these. Is the correct one selected? And, in probably a related issue, I was unable to even access the Firefox home page this morning, although the internet indication in the lower right corner of my screen was white (indicating an active internet connection). When I clicked on the Firefox logo on the desktop and on the tray, I got the message: Program Files (x86)\Mozilla Firefox\firefox.exe Class Not Registered I went to my Program Files, clicked on Mozilla Firefox, and clicked on the Firefox logo. Lo and behold, the page opened and I was able to access websites. I need to tell you that I am not very tech-oriented. I do try to keep my laptop current with updates and backups, but the technicalities of anything more really confuses me. If you have any advice about either issue, I would really, really appreciate it. And, do I need a proxy? As I understand from what I have read, since I have only one computer (laptop) and I don't share an internet connection (except when I use my kindle to go online), I don't need one and perhaps I should check the "no proxy" option. Thanks so much for your help!

Question owner

And, in another development with the second issue, I closed the Firefox windows then tried to click on the desktop and tray icons but kept receiving the Class Not Registered box. I had to go into the program files (x86)>Mozilla Firefox>firefox.exe to open the Firefox page. Why do the icons no longer work?

  • sigh* It really is frustrating!
And, in another development with the second issue, I closed the Firefox windows then tried to click on the desktop and tray icons but kept receiving the Class Not Registered box. I had to go into the program files (x86)>Mozilla Firefox>firefox.exe to open the Firefox page. Why do the icons no longer work? *sigh* It really is frustrating!
finitarry 251 solutions 3421 answers

If you are not using a proxy (something that passes on requests from the browser and replies to the browser thru itself), then the best setting is "No Proxy". The default, "Use System Proxy Settings", does not work for everyone. Why it was changed to the default, I have no clue.

If you are not using a proxy (something that passes on requests from the browser and replies to the browser thru itself), then the best setting is "No Proxy". The default, "Use System Proxy Settings", does not work for everyone. Why it was changed to the default, I have no clue.