HTTP Error "401 - Unauthorized: Access is denied due to invalid credentials." is reported when connecting to any IIS Server

[Nikolay Morozov]

I try connect any IIS Server (f.ex Team Foundation Server or Share Point) i got an error 401 or 401.1
"401 - Unauthorized: Access is denied due to invalid credentials.". Log-in dialog doesn't pop-up. Downgrading to Firefox 29 or installing Firefox ESR will solve this problem.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: firefox 30.0+build1-0ubuntu0.14.04.3
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: sobol nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nmorozov 3462 F.... pulseaudio
 /dev/snd/pcmC0D0p: nmorozov 3462 F...m pulseaudio
BuildID: 20140608211622
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Channel: Unavailable
CurrentDesktop: XFCE
Date: Mon Jun 16 17:55:10 2014
EcryptfsInUse: Yes
ForcedLayersAccel: False
InstallationDate: Installed on 2012-10-11 (613 days ago)
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.1)
Plugins:
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
 VMware Client Support Plug-in - /usr/lib/vmware-cip/5.1/np-vmware-client-support.so
 VMware Remote Console Plug-in - /usr/lib/vmware-vmrc/5.1/np-vmware-vmrc-5.1.0-826423-64.so
PrefErrors: Unexpected character 'n' before value @ [Profile]/<email address hidden>/defaults/preferences/netvideohunter.js:13
PrefSources:
 prefs.js
 [Profile]/extensions/{3d7eb24f-2740-49df-8937-200b1cc08f8a}/defaults/preferences/flashblock.js
Profiles: Profile0 (Default) - LastVersion=24.6.0/20140609182057 (Out of date)
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to trusty on 2014-05-05 (42 days ago)
dmi.bios.date: 10/02/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1406
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5Q
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1406:bd10/02/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5Q:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
ftp_proxy: http://127.0.0.1:3128
http_proxy: http://127.0.0.1:3128

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[mip (mpaukkila)]

The problem is related to https://developer.mozilla.org/en-US/Firefox/Releases/30/Site_Compatibility#Security) / NTLMv1 auth has been disabled, NTLM support on non-Windows platforms is now deprecated.