It looks like there is an error with the 'mimetypes' set for Firefox. I don't know how to fix it. I have reported a similar bug before because I was not able to open (I think it was) '.pdf'.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: firefox 9.0.1+build1-0ubuntu0.11.10.2
ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
Uname: Linux 3.0.0-15-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC260 Analog [ALC260 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
ApportVersion: 1.23-0ubuntu4
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC260 Analog [ALC260 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: el_gallo_azul 1600 F.... pulseaudio
/dev/snd/pcmC0D0p: el_gallo_azul 1600 F...m pulseaudio
BuildID: 20111228084953
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xe8a00000 irq 44'
Mixer name : 'Realtek ALC260'
Components : 'HDA:10ec0260,103c3011,00100400'
Controls : 24
Simple ctrls : 13
Channel: release
Date: Thu Jan 26 08:48:41 2012
ForcedLayersAccel: False
IfupdownConfig:
auto lo
iface lo inet loopback
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
IpRoute:
default via 192.168.0.253 dev eth0 proto static
169.254.0.0/16 dev eth0 scope link metric 1000
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.2 metric 1
Profiles: Profile0 (Default) - LastVersion=9.0.1/20111228084953 (Running)
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to oneiric on 2011-11-13 (73 days ago)
WifiSyslog:
dmi.bios.date: 05/18/2005
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786D1 v01.03
dmi.board.name: 09F8h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: 43e0119
dmi.chassis.type: 4
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786D1v01.03:bd05/18/2005:svnHewlett-Packard:pnHPCompaqdc7600SmallFormFactor:pvr:rvnHewlett-Packard:rn09F8h:rvr:cvnHewlett-Packard:ct4:cvr:
dmi.product.name: HP Compaq dc7600 Small Form Factor
dmi.sys.vendor: Hewlett-Packard
Thank you for reporting this to Ubuntu. As I understand it, .aspx is a server side extension and as such, Firefox shouldn't open it, but it needs to be served properly from a web server like Apache or IIS (since this is probably an ASP.NET site).