Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Windows 7 wireless problems with MDNS

08 Feb 2013   #1

Windows 7 Ultimate x64
Windows 7 wireless problems with MDNS

Hello everyone... I'm so glad to join you guys... I have this one issue, which I'm hopeful you guys will help me out with...

I use a plugin we have created for IE... It detects devices over the network... Devices are the ones that we ourselves have created... Now this plugin works fine and detects devices when it is wired with the Ethernet on our Subnet in XP as well as Windows 7... It detects devices when it is connected Wirelessly over our Subnet in Windows XP... But when I connect it with my Wireless subnet over Windows 7 it stops discovering the devices... The moment I enable my LAN it again detects the devices... It's behaves very stange on this part and I can't be sure that Windows 7 is responsible for this but it had to be considered... There seems like a wireless security affecting it but there is no such proof as off now...

We use mDNSresponder.exe for the communication with the devices which has a protocol called MDNS... I used Wireshark to sniff the packets over the network and found out that, while running in a wired network I can see requests and responses over the MDNS protocol... But when I switch to Wireless network there is no request or response over MDNS and hence there is no query sent only over the network... Seems like when I connect with the Wireless network, something blocks the plugin from querying the network... Help me out with this if possible... Thanks so much...

I use Windows 7 64-bit OS and Internet Explorer 9... The tests have been made over Windows 7 32-bit and IE version 8 and 9, to give the same outcome... Windows firewall has been turned on/off as well...
I'm sorry if I've posted over a wrong thread, please forgive me for any inconsistencies... Any help is appreciated and please let me know if I could guide you in a better way... Thanks so much...

My System SpecsSystem Spec
12 Feb 2013   #2

Windows 7 Ultimate x64

Ok the issue is solved... The problem was that my program was not being able to find the IEEE 802.11 wireless network interface... Since the dawn of Vista, Windows has changed some it its architecture and my program was made years before that...

Before Vista, the network adapter type value for Ethernet and IEEE wireless was same i.e 6 and is known as MIB_IF_TYPE_ETHERNET... But now they both have been differentiated and IEEE wireless adapter gets a new value 71 named IF_TYPE_IEEE80211... In our code we had a validation to reject network adapters other than MIB_IF_TYPE_ETHERNET and so it used to work with XP, but Windows 7 had other plans... Adding another validation for IF_TYPE_IEEE80211 solved the problem.

You can check out the below link to get more clarity over this and let me know if you've any queries... IP_ADAPTER_INFO structure (Windows)

My System SpecsSystem Spec

 Windows 7 wireless problems with MDNS

Thread Tools

Similar help and support threads
Thread Forum
Windows 7 Wireless connectivity problems
OS :- windows 7 Problems found on HP PAVILION DV3515 , HP PRESARIO CQ61 Unable to connect wireless if there is more available wireless connections are detected Wireless disconnecting if any new wireless range has detected Actions Taken :- Drivers and OS update could not resolve...
Network & Sharing
windows 7 wireless problems
I updated Vista to Windows 7 yesterday on my Dell Inspeion 15 computer. I can connect to my router by cable but not by wireless. I get a message that "Windows can not connect to my router" and the wireless status is "Limited Access". Can anyone help.
Network & Sharing
Windows 7 wireless network problems!
:shock: Hi there! I have recently purchased a Sony VAIO laptop installed with Windows 7! I am using this on a home network with a Linksys WRT54G@v1 wireless router, but the connection keeps dropping out, and then eventually refusing to reconnect! The first couple of weeks there were no...
Network & Sharing
Windows 7 wireless problems
wondering can someone help. Im a complete beginner. After installing windows 7, I have not been able to get my computer to recognise my wireless network. If it does recognise it, it then will only allow limited or no access. I have a HP pavillion dv9700. Please help.
Network & Sharing
Help with wireless problems on windows 7
Hi. First time to post here. Just had my lenovo y410 upgraded from vista to windows 7 recently. Encountered one big problem though. if i shut down my computer, the wireless on light does not light up and the wireless network does not function at all. Afterwards, when i hibernate the computer,...
Network & Sharing

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 05:50.
Twitter Facebook Google+