Detect default proxy settings

I am creating an applet which needs to get data from the internet. Since the applet will be run behind different firewalls, I was wondering how to detect the default proxy, i.e. the one the browser is using. Many apps I have seen have an option 'auto detect proxy' and I was wondering how to implement this in an applet.
Thanks

you might find that proxy settings are in the registry somewhere; i'd be guessing that's how these apps do it.
as your app is java it shouldn't typically be looking up registry keys, but if it's only going to be running on windows, then .....

Similar Messages

Detecting client proxy settings

Dear All,
Can anyone tell me how to detect client proxy settings from a java application (not in a browser).
I tried System.getProperties().getProperty("http.proxyhost") without success.
Our application is distribuited using Java Web Start technology and needs to know proxy settings to connect to the remote host thru an unknown proxy server.
Solution to this problem is very important and urgent! Please help me!
Thanks in advance!

Look for
proxyHost
proxyPort
or (for https)
https.proxyHost
https.proxyPort

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.

What is proxy settings default?

I'm wondering what is the proxy settings default setting? On my computer it is set to "Use system proxy settings" I'm wondering what should be the default the version of firefox I am using which is the latest version of firefox.

"Use system proxy settings" is the default in current Firefox versions and should work in most cases.<br />
Only if there are problems then you can try to select "No Proxy".
* https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can
*Bug 500983 - "Use System Proxy Settings" should be default for new profiles.

Detect proxy settings and ports

Hello forum, I have a project to find out which servers or applications/services are going through ISA 2006 proxy. The servers comprise of WIndows 2003 and 2008 R2 boxes. I tried proxcfg.exe (pre 2008) and netsh winhttp show proxy (post 2008) but I get following
results. I know that these boxes do use proxy servers because they show up when I query ISA logs.
C:\proxycfg
Microsoft (R) WinHTTP Default Proxy Configuration Tool
Copyright (c) Microsoft Corporation. All rights reserved.
Current WinHTTP proxy settings under:
HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\
WinHttpSettings :
Direct access (no proxy server).
C:\netsh winhttp show proxy
Current WinHTTP proxy settings:
Direct access (no proxy server).
I have also looked at registry keys HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
Settings but found nothing of relevance. Checked IE settings and found no proxy configuration. How can I check which application or service is using proxy and on which port? Thanks again.

Thanks Quan, a little background, ISA version is 2004 and the traffic logging is done on a different box with SQL 2005. Which means that all server, service/application or user generated traffic first hits ISA boxes and data is logged in SQL server. Now, I
ran a query on SQL boxes to see if there are servers or applications still accessing old ISA servers and found that many still are using that route. The query I ran is
select clientusername,Max(logtime)
from webproxylog
where logtime > '2014-03-04'
Group by Clientusername
Outcome is a list of servers and users accessing old ISA servers, please see below
clientusername
TimeStamp
Domain\USER1
12/03/2014 9:42
Domain\USER2
10/03/2014 8:29
Domain\SERVER1$
12/03/2014 6:33
Domain\SERVER2$
7/03/2014 23:05
Domain\SERVER3$
7/03/2014 23:09
Domain\SERVER4$
7/03/2014 22:18
Domain\SERVER10$
12/03/2014 0:15
Domain\SERVER12$
6/03/2014 13:00
Domain\SERVER21$
9/03/2014 15:05
Domain\USER46$
6/03/2014 7:17
Domain\SERVER22$
5/03/2014 17:25
Domain\SERVER73$
12/03/2014 9:11
Domain\SERVER14$
5/03/2014 17:31
So I logged on to few servers to check proxy settings. The server list comprise of Windows 2003 and 2008 R2 boxes. On a handful of servers I found proxy, under IE settings but on others I didn't find any proxy settings (under IE). Then I tried proxcfg.exe (pre
2008) and netsh winhttp show proxy (post 2008) but I got following results, please see below.
C:\proxycfg
Microsoft (R) WinHTTP Default Proxy Configuration Tool
Copyright (c) Microsoft Corporation. All rights reserved.
Current WinHTTP proxy settings under:
HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\
WinHttpSettings :
Direct access (no proxy server).
C:\netsh winhttp show proxy
Current WinHTTP proxy settings:
Direct access (no proxy server).
I have also looked at registry keys HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings but found nothing of relevance. Checked IE settings and found no proxy configuration. Then why are my servers using old proxy servers?

Where can I read the proxy settings Firefox chose, when configured to use "Auto-detect proxy settings for this network"?

I would like to set my system network proxy settings to those, Firefox chose. Firefox is configured to use "Auto-detect proxy settings for this network" and this works fine. How can I read out the settings Firefox chose, so I can adapt these system?

Hello Richard,
Download MozBackup and make a backup of your bookmarks and passwords. Uninstall firefox and remove ALL folders with the name "Firefox".
Install Firefox and restore your bookmarks and passwords. Now you should have a fresh install so you have to make all settings again.

Why Does It Take So Long To Detect Proxy Settings?

Windows 7 Ultimate x64 with all patches
Internet Explorer 10 with all patches
The first time I start Internet Explorer after booting it takes a very long time (>30 seconds) to detect proxy settings. There is nothing else running on this machine. I have this problem if IE is the first thing I open after booting.
Why does it take so long and how can I speed this up?
http://www.saberman.com

Hi,
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If yes, we will archive this thread temporarily.
No
If no, please reply and tell us the current situation.
No
If you have any other question, feel free to contact us. We will try our best to help you.
The thread was marked as answered eventhough it wasnt'. What more can I say.
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Detecting proxy settings

According to the unofficial web start faq (http://lopica.sourceforge.net/faq.html)
a web start program can find out the proxy settings by doing a ....
System.getProperty("proxyHost")
System.getProperty("proxyPort")
But this doesn't seem to work for me. I set my proxy under firefox, and run under webstart via http protocol, and these come up null. I also tried getting http.proxyHost to no avail. I also tried the reset proxy settings in the web start console (whatever that is supposed to do), which didn't seem to do anything either.
Does this work for anybody else?

These settings were used by Java 1.2 (and maybe 1.3), and superceeded by System properties httpProxyPort and httpProxyHost. These were themselves superceeded in Java 1.5 with the addition of the java.net.ProxySelector class.
Now when running in Java version 1.5+, webstart and plugin will call ProxySelector.setDefault(), which will set up a proxy selector that will dynamically set the proxy when a URLConnection is made. This allows the full implementation of proxy pac files, which may determine a differant proxy depending on the host being accessed.
If you are running in Java Web Start 1.5.0 or later you can call ProxySelector.getDefault(), and use the returned proxy selector to find the proxy using the select() method with your URI.
/Andy

BIOS not detecting notebook hard drive after setting default BIOS settings.

I had my Ubuntu 14.04 installed in my laptop in a drive named "Notebook hard drive" in addition to a pre-installed Windows 8. Today I set the default BIOS settings in my laptop and when I rebooted it and tried to use Ubuntu by pressing "F9" key and choosing from the BIOS menu I found my "Notbook hard drive" option missing. My Ubuntu drive is still there but I have no way to access it. Is there any way I can get it back to working?
This question was solved.
View Solution.

Try disabling secure boot in the BIOS and then restarting the notebook.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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

Why or how could firefox change my proxy settings without me doing anything right in the middle of browsing the internet?

== Issue
==
I have another kind of problem with Firefox
== Description
==
While I was browsing the internet suddenly nothing would happen when I clicked a link. Upon closing and opening firefox and trying to load a web page it said "the proxy server is refusing connection. Firefox is configured to use a proxy server that is refusing connections."
I did manage to fix the problem by changing the proxy settings from manual to auto-detect but what disturbs me is how those settings could be changed without me doing so right in the middle of using the internet. I dont know if its a bug or a security issue but I thought I would let you guys know.
== This happened
==
Just once or twice
== In the middle of browsing the Internet
==
== Troubleshooting information
==
Application Basics
Name Firefox
Version 3.6.7
Profile Directory
Open Containing Folder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Exif Viewer 1.55 true [email protected]
Java Console 6.0.18 false
Java Quick Starter 1.0 false [email protected]
Microsoft .NET Framework Assistant 1.1 true {20a82645-c095-46ed-80e3-08825760534b}
FiddlerHook 2.2.8.2 false [email protected]
Torbutton 1.2.5 true
Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar 0
browser.places.importBookmarksHTML false
browser.places.smartBookmarksVersion 2
browser.startup.homepage www.google.ca
browser.startup.homepage_override.mstone rv:1.9.2.7
browser.tabs.warnOnClose false
extensions.lastAppVersion 3.6.7
general.useragent.extra.microsoftdotnet (.NET CLR 3.5.30729)
network.cookie.prefsMigrated true
network.security.ports.banned 8118,8123,9050,9051
places.last_vacuum 1279480436
privacy.cpd.cookies false
privacy.cpd.sessions false
privacy.sanitize.migrateFx3Prefs true
privacy.sanitize.timeSpan 0
security.warn_viewing_mixed false
== Firefox version
==
3.6.7
== Operating system
==
Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.7) Gecko/20100713 Firefox/3.6.7 (.NET CLR 3.5.30729)
== Plugins installed
==
*-Adobe PDF Plug-In For Firefox and Netscape
*Default Plug-in
*Shockwave Flash 10.0 r42
*Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
*Next Generation Java Plug-in 1.6.0_18 for Mozilla browsers
*Npdsplay dll
*DRM Store Netscape Plugin
*DRM Netscape Network Object

Calvin W.:
Your extensions list shows an enabled "Torbutton 1.2.5" extension, so it is possible that that extension is responsible for that change.

JWS not Inheriting PROXY settings from Netscape

Hi!
We are using JWS 1.0.1_01 to launch our application, which needs the proxy settings of the user to connect via SSL to our servers.
We do not have any problems when the user does not use proxies to access the Internet or uses Internet Explorer as their default browser.
For users with Netscape 4.* as their default browsers, many users are not able to launch our application, as it can not find the proxy settings.
They can not download the sample applications of Java Web Start either.
They work fine if they make Internet Explore as their default browser or set the proxy manually in Java Web Start.
As our customers use some sort of scripts for proxy configurations we do not want to set the proxy manually in Java Web Start.
We want to use the proxy settings of the browser.
So I want to know if there is a known issue with Java Web Start not detecting the proxies automatically from Netscape.
Any help appreciated.
Thanks
-Nawaz

Basically web start can only pick up the settings of whatever
happens to be the current Windows default browser. If that's Netscape then the Netscape settings will be used.
Since your clients are using a script to specify the proxy settings you should also be aware that there's an issue with web start 1.0_01 where it locates the proxy setting based on the first occurrence of the word "Proxy" in that script. This can cause issues if the first proxy
listed is for https only of even if the first occurrence of "proxy" is
inside a comment.

Something keeps changing my proxy settings

So I use a proxy to access the Internet at school, the settings for which I set in system preferences. I enter the details and tick the box saying it requires username and password details etc. I go out of that and then press apply. The trouble is, after about a minute usually a box comes up with red sign saying I need to enter my password details. Lo and behold I go back to the proxy settings, and the box I ticked a minute earlier is now unticked, and I have to do the process again. Any ideas anyone? I have had to start using Opera, which I'm not a huge fan of, because it has inbuilt proxy settings, but I can't get round not being able to access the iTunes Store etc.

Do a malware check with some malware scan programs. You need to scan with all programs because each program detects different malware. Make sure that you update each program to get the latest version of the database before doing a scan.
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and Searches are redirected to another site

Web proxy settings not getting affected for Mozilla Firefox

I have an ISA Server setup as a web proxy in our domain environment . I have changed the proxy settings to the address of the new web proxy server for all the users in the domain by using group policy . Even the connection tab on the internet options have been disabled so that users wont be able to view the settings thereby preventing them from changing the proxy settings . It has been completed successfully . But when we tested the settings with various browsers by trying to access the blocked sites in our environment such as Facebook and other social networking sites , IE , Safari and Chrome seems to be detecting the proxy in the network and was blocking it but Mozilla Firefox and Opera does not seem to be affected by the change and users could have unrestricted access to the web . Please help me with how to configure mozilla firefox proxy settings using group policy edit .

I am facing a similar issue with the flash content on my website (appnina.com). Any flash content is not displayed on my website.
The problem is because of using flash plugin in Mozilla Firefox (21.0 - updated). The flash plugin does not get activated by default. That is whenever opening the site, the flash content is not displayed. It asks to click the activate button. This activation should be one time, however it always asks to do so whenever opening the site.
I just checked and found that this flash problem is not specific to my website but in general (youtube as well).
Let me put the screen shot of the same.
Any permanent solution to this. Let me check if I can delete the old plguin and download it again to solve this issue.
The problem seems to be because of compatibility problem of firefox with flash.
PS: Let me know if I need to start a new discussion thread on this ?

Windows 8 / IE11 forget proxy settings applied by GPO on reboot

I've just about run out of ideas here on what may be causing this. I've toyed with policies quite often, but never ran into this problem before.
Windows 8 with IE11. While there are GPO's active on the system, the settings are kept free to alter by the user if need be. We use a proxy, so I'm required to provide the proxy and the exceptions in a policy to the PC's to make sure they work under normal
conditions. I added a couple of settings in the GPP (Group Policy Preferences) with the correct settings, enabled these settings (green lines) and tested these on a test system. They work fine, I get my proxy settings pushed through.
Then we get to the rollout on the systems that are affected (not that many, just 10 accounts total, all in nearby rooms). I can run a gpupdate /force to reload the settings, and can confirm the proxy settings are applied properly. So the policy itself seems
sound also on the workplaces it needs to be active on. Users still have the option to change the proxy settings on their own discretion, but that's exactly what we want to happen.
Now we run into the problem that when part of these PC's are rebooted, the PC somehow seems to decide the proxy isn't worth its time anymore, and kills all settings for the proxy back to default. Either that, or it just switches the proxy off. Running a
gpupdate /force reapplies the policy and everything starts working again, but WHY is Windows 8 / IE11 adament about forgetting these settings?
The really maddening thing is that on a couple of PC's with Windows 8 and IE11 (and the same policies applied) it isn't a problem and the proxy remains filled in, as I would expect from GPO's. These include my test system, which makes me unable to replicate
the problem and test locally.
I've tried enhancing the policy with using a forced wait for the network to become available) aswell as a forced logonscript run on boot instead the standard 'after 5 minutes'. Find these under 'Computer Configuration - Policy - Administrative Templates
- System - Logon' and 'Computer Configuration - Policy - Administrative Templates - System - Group Policy'. Neither setting seems to work tho. I've also tried going with a Computer Configuration Startup script in which I just request to run 'gpupdate' with
the '/force' as the switches. But this also seems not to do anything.
In short: Does anyone know why Windows 8 / IE11 falls back to something outside the scope of policies, while it accepts the forced policy update with the correct settings when 'gpupdate /force' is issued manually afterwards? And has anyone any idea what
I can do to make sure the policy is applied regardless of what Windows 8 / IE11 thinks it should be?

Just had a go with that... Found out that when I login and refresh the polciy using gpupdate /force, the proxy settings are filled in properly.
Once I reboot tho, the proxy switches itself off (the entries regarding the proxyname and such remain, as does the 'bypass for local addresses, but it's all grayed out). Once I switch the proxy back on, and check under 'Advanced', I find everything in order,
except for the exclusion list which is emptied.
So I forced the gpupdate, verified that the proxy was switched on, and the exclusion list was populated. I then restarted the PC, only to find that above situation (proxy switched off, and exclusionlist empty) had reasserted itself.
Waited a bit and did a forced policy update again. Then verified the logged files (which was just User.txt).
After anonymizing the output a bit, I copied the contents to
http://pastebin.com/YyWswW83 for your review. It looks like it contains 3 batches of GP updates.
The one at 13:20 is likely the primary one in which I forced the GPUpdate. The one at 13:22 is the one issued on the restart of the computer, while the one at 13:24 is the (once again) forced gpupdate.
From my understanding it seems as if the no-change of GPO detection works, but also causes it to skip the policy. Tho I admit that's speculation on my part. Any and all light you (or anyone else) may be able to shine on this, will be greatly appreciated.

Detect default proxy settings

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