Remove/Change Proxy Settings Without Logging In

Is there a way to change the proxy settings without logging in?
Our proxy server went down and Spiceworks will not allow pro users to log in because of it. I can't change the settings because I can't login. Does anyone know of a way to change the settings another way?
We can't login on the server or via workstations. This only affects pro users.
This topic first appeared in the Spiceworks Community

HI Norm,
Open System Preferences/Network. Select Airport in the panel in the left then click the Advanced tab then click the Proxies tab. Where you see: Select a protocol to configure Make sure there are NO boxes checked.
Click the Airport tab in that same window. Make sure your network is listed under: Preferred Networks
If not, cick + Type in your network name or click Show Networks and select it from there. Your network should be listed in the Preferred Networks window now. Just below that window select the box next to: Remember networks this computer has joined.
If you still have problems, open Airport Utility (Applications/Utilities)
Select your device on the left then click Continue. In the next window click: I want to restore this AirPort device to its factory settings and then set it up again; then click Continue.
I'm on Comcast without using any Proxies.
You can disconnect the Comcast cable modem from it's power source for about 5 minutes then reconnect. Sometimes you have to recycle the modem.
AirPort troubleshooting guide
Also, on the G5. Go to /Library/Preferences/System Configuration and move these files to the Trash.
com.apple.airport.preferences.plist
com.apple.nat.plist
com.apple.network.identification.plist
You may only see the com.apple.airport.preferences.plist file in that list since it's running 10.5.x
Don't worry about the other .plist files if they are not available.
Carolyn
Message was edited by: Carolyn Samit

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== 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
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