Firefox not detecting/using system proxy settings

I use a command line script to change among various proxies (and none). Firefox does not recognize when a proxy is turned on or fails to connect to it (no error messages), while other browsers and applications do just fine.
I have tried selecting "Use system proxy settings" and "Auto-detect proxy settings for this network."
My script contains these lines to activate a proxy
reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections" /v DefaultConnectionSettings /t REG_BINARY /d 46000000b10000000200000014000000736f636b733d3132372e302e302e313a313131311c0000002a2e6c6f63616c3b3139322e3136382e31312e2a3b3c6c6f63616c3e000000000000000000000000000000000000000000000000000000000000000000000000 /f
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v MigrateProxy /t REG_DWORD /d 1 /f
The first line enables the proxy to take effect without entering inetcpl.cpl. Again, this works for any application other than Firefox.
The proxies are all through ssh with port forwarding.
I do not want to manually configure a proxy in Firefox, because I do not want to change this every time I need to change proxies or turn them off. This is not an acceptable solution.
I am on Windows 8.1 64bit, with Firefox version 35.0
Any idea what might be going on here?

Thank you for the response, but as above, the "Auto-detect proxy settings for this network." setting does not work.

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Windows - Use system proxy settings not working as expected

Hi everyone,
I have a bit of an issue that I could use some help with. We currently have remote users that utilize an SSTP VPN connection to access our internal network. Once connected, those users are required to use an internal proxy server to connect to the Internet. The proxy server is Microsoft's TMG and utilized domain authentication.
On our remote Windows clients we have their Internet Options configured to utilize a proxy as follows:
Internet Options -> Connections -> LAN Settings -> No proxy configured at all
Internet Options -> Connections -> Highlight SSTP Connection -> Settings
Use a proxy server for this connection -> IP/Port of Proxy Server
Firefox and Chrome are both configured to use system proxy settings.
Here is my process to demonstrate the issues:
Remote client workstation is rebooted.
With the above configuration just after a reboot, a remote user that is not connected to the VPN can browse the Internet with Internet Explorer, Chrome, and Firefox. None of the browsers prompt for credentials.
A remote VPN connection is then established.
FF is opened and HTTP connections utilize the proxy server. However, HTTPS connections do not use the proxy server, but instead attempt to use the default gateway. FF does not prompt for credentials. FF is closed.
Chrome is opened and can access both HTTP and HTTPS sites without issue. No credential prompt. Chrome is closed.
IE is opened and can access both HTTP and HTTPS sites without issue. No credential prompt. IE is closed.
Here's where it gets weirder...
FF is then reopened. The VPN connection is still up. FF will prompt for credentials. Domain credentials are supplied and FF can now utilize the proxy for both HTTP and HTTPS connections. FF is closed.
VPN is disconnected.
FF is opened and cannot access the Internet as it is still trying to use the proxy server. FF is closed.
IE is opened and can access the Internet. IE is closed.
Chrome is opened and can access the Internet. Chrome is closed.
FF is reopened and can now access the Internet. FF is closed.
In summary, in the above scenario FF acts in an unexpected manner with regards to proxy usage when "use system proxy settings" is applied. However, Firefox begins acting as expected after IE is opened and closed. For example, connect to VPN, open IE, close IE, open FF, and everything works accordingly. Disconnect the VPN, open IE, close IE, open FF and everything works as expected.
Any insight you can provide would be appreciated as it is affecting our FF users and the sooner we can achieve resolution the better. As a note, we've also worked through this issue with WPAD and proxy auto-detect. I've intentionally removed these from the equation to simplify troubleshooting.
Thanks

Quick update. Added to a previously filed bug. Looks like it's assigned now so maybe we'll see a fix for this soon.
https://bugzilla.mozilla.org/show_bug.cgi?id=563169

"Use system proxy settings" Not working on Mac OS X Snow Leopard

When I change the network location or when I select "Use system proxy settings" on the connetion configuration dialog.
Firefox is not using the proxy defined on the loction set on Mac OS X Snow Leopard.
I usualy change from work to home, at work I've a proxy and at home I don't, and it's a bit annoying to have to change the proxy twice a day. So I tryed this feature, but It's not working for me.
I've tryed also with Firefox 3.6 (I think) and didn't work either.

I run it from eclipse, and on debug mode i checked the value of
java.library.path, and it was ok.
Any way, how can i do what you suggested on mac?It's just a command line argument, but there's no reason to add it if your
java.library.path is ok. One of its componenents must be a directory where
your shared lib is stored, that's all. BTW, the Mac is unix based isn't it?
Shouldn't it be an .so file then? (just a wild guess)
kind regards,
Jos

Use System Proxy Settings - when this is selected in FF v3.6.6, does it adhere to the same local IE proxy setting? We use a pac file configured in "Use automatic configuration script."

Does anyone know what Firefox looks at locally on the PC when the "Use System Proxy Settings" setting is selected? It appears to be the default setting, recently changed from "No Proxy" of versions past...
Our company uses a pac file specified in IE under "Use automatic configuration script" - with this new default, does it adhere to the same setting in:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]

I may be wrong but I think that the "Use System Proxy Settings" makes sense only on Linux and generally speaking "other OSes". As far as I know there is no generic proxy settings in Windows operating system.
The one I know is in the registry part of Internet Explorer.
So in my understanding in Windows, Use System Proxy Settings = No Proxy

Safari does not using system proxy settings (charles web proxy)

Using OSX 10.7.3 and Safari Version 5.1.3.
I start Charles, the web debugging proxy. On start, Charles adjusts the proxy settings in the Network Panel of System Preferences as expected. But Safari does not / will not honor these settings.
Has anyone else had this problem?
J

You have to apply the change before it takes effect.

How do "Auto-detect proxy settings for this network" and "Use system proxy settings" work behind the scenes?

How can I see what the proxy firefox actually uses when I check either of these two options?
Does it take it from Internet Explorer?
Are they stored somewhere in the registry?

Hi conectionist,
This is taken if there is a proxy set up in your network settings on your OS. If you would like to test there may be an add on:
*[https://addons.mozilla.org/en-US/firefox/addon/smart-ip-connection-info/?src=search]
Please feel free to search to find a better one if necessary.

System Proxy Settings only work as root

Using Firefox 10.1 on Suse Linux Enterprise Edition 11 SP2
Setting the System Proxy settings to our Proxy and using Firefox with "using System Proxy Settings" works as root user. The Authentication Prompt for Authentication Pops up and after entering the credentials FF works.
The very same Settings do not work as non-root User. Not even the Authentication Prompt for Proxy Authentication pops up.
All Proxy Settings are available too both users (checked Variables exported in Shell).
Any Pointers appreciated.

Yes, entering the Proxy settings manually does work. Even the automatic configuration using the proxy.pac works. Just the "Use System Settings" part does not.

What does the setting 'use system proxy setting' mean?

I am using a proxy server that requires my email address which I need to change. I can't figure out how to change the proxy server settings. Under preferences, network, settings, the checked box is 'use system proxy settings' -- I don't know what this means or how to see what the proxy setting is and possibly change it.
Thank you

If the default "Use system proxy settings" is selected then Firefox will try to query the OS to find which settings to use. 
If you want to use a specific proxy in Firefox then you can select use "Manual proxy configuration" and enter the URL and port number that you want to use.
* http://kb.mozillazine.org/network.proxy.type
* http://kb.mozillazine.org/Network.proxy.%28protocol%29
* http://kb.mozillazine.org/Network.proxy.%28protocol%29_port

How to stop Quicktime using IE Proxy Settings

Hi there,
My company's Proxy Server (Microsft ISA Server) requires Windows Integrated authentication which Quicktime does not support so QT web access fails.
We have a Winsock Proxy component installed on the clent but for this to come into play we need to configure Quicktime not to use IE Proxy Settings as otherwise QT tries to talk to the Proxy server and cannot authenticate.
I have spent a number of hours looking into this but cannot find any way to do this. I know a lot of app's allow you to turn off using IE's Proxy settings and wanted to se if anyone knew how to do this with QT.
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Why not just right-click and save the linked file to your computer?
Open the .mp3 with any app you choose.
You can disable the QuickTime plug-in from playing .mp3 files in a browser window by opening the QT Control Panel/Advanced and click the MIME Settings button. Remove the check mark for the .mp3 format and restart your browser for this change to take effect.

When I open firefox it says something about proxy settings! how do i fix this so I can start using it again

It won't let me do anything! All it says The proxy server is refusing connections
Firefox is configured to use a proxy server that is refusing connections.
* Check the proxy settings to make sure that they are correct.
* Contact your network administrator to make sure the proxy server is
working.
I clicked the button to reload or whatever and nothing happens just the same old thing over and over!

Check the connection settings.
*Tools > Options > Advanced : Network : Connection > Settings
If you do not need to use a proxy to connect to internet then select "No Proxy" if the default "Use the system proxy settings" setting doesn't work.
See "Firefox connection settings":
*https://support.mozilla.com/kb/Firefox+cannot+load+websites+but+other+programs+can
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

PowerShell 4.0 ISE doesn't use the system proxy settings

I can retrieve the contents of a URL using something like 'iwr
http://www.adobe.com' in the command-line PowerShell host.
This takes into account the proxy settings in Control Panel / Internet Options.
If I attempt the exact same thing in the PowerShell ISE, I get:
iwr : The remote name could not be resolved: 'www.adobe.com'
This works only if I add the -Proxy and -ProxyUseDefaultCredentials options.
How comes?
How do I fix this?

I hate to say, but I don't understand how what I see is compatible with your statement.
Let me show what I'm experiencing with more details.
Here's what I get without any proxy options from powershell.exe:
PS 4.0 ~> $r = iwr http://www.adobe.com
PS 4.0 ~> $r -eq $null
False
PS 4.0 ~> $r.GetType()
IsPublic IsSerial Name                                     BaseType
True     False    HtmlWebResponseObject                    Microsoft.PowerSh...
and here's what I get from the ISE:
PS ~> $r = iwr http://www.adobe.com
iwr : The remote name could not be resolved: 'www.adobe.com'
At line:1 char:6
+ $r = iwr http://www.adobe.com
+      ~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-W
   ebRequest], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebR
   equestCommand
PS ~> $r -eq $null
True
If the CmdLet requires the -proxy option, how do you explain the results I get without the option from powershell.exe?
Next to that, here's what netsh reports:
PS 4.0 ~> netsh winhttp show proxy
Current WinHTTP proxy settings:
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This is not what I have under "Internet Options", where "Automatically detect settings" and "Use automatic configuration script" are both checked. But IIRC from the proxycfg.exe days this reports the "system-wide"
proxy settings, not the per-user proxy settings.

I use the proxy settings add-on in Firefox to access my company server. However, I updated Firefox this morning to the latest version. Now this add-on doesn'tl.

I used the proxy settings add-on to access the company server and wi-fi with my Android 2.36 phone.
This morning I updated Firefox. The add-on doesn't work anymore. I uninstalled it and went to the add on website to reinstall what I thought must be a new version. This add-on doesn't seem to exist anymore.
How do I change proxy settings with the new version of Firefox for Android?

The author of the add-on will need to update their version to be compliant with our newly rewritten Firefox for Android product.
The new version of Firefox does not provide a user-interface for manipulating proxy settings.
On the other hand, you can manipulate these settings yourself at your own discretion by visiting the URL about:config and searching for network.proxy
http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries

Can lync client use internet proxy settings to proxy edge servers, if direct access is not reachable?

Hi everybody I am trying to Login with my lync Client out of my organization. So I am using lync as a remote user. I am in another organization, and I am using their coporate lan wired and wireless, but I cannot Login to lync in my organization.
I see that I cannot Access my edge Server on port 443 to authenticate directly, I know that Client in this organization use Internet Proxy to browse the Internet. they have a .pac in their ie Settings.
my question is; can lync Client use Internet Proxy Settings to reach the Destination? I mean the Access edge on port 443?
or it can use only Client direct Access to reach the edge Servers?
I Think that the answer is that I use tcp protocol and not http, and maybe that is the reason why I cannot use the Internet Explorer Proxy Settings to reach the Access edge Servers, different maybe is the case I Need to reach the reverse Proxy for live Meetings.
Hope my question is clear.
Thanks

Proxy settings are used to tell Internet Explorer the network address of an intermediary server (known as a proxy server) that is used between the browser and the Internet on some networks.
Lync client doesn’t use Internet Proxy Setting. You need to access the Edge service directly.
Lisa Zheng
TechNet Community Support

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Firefox not detecting/using system proxy settings

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