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Windows 7: Network problems


23 Nov 2009   #1

 
 
Network problems

how do I troubleshoot this...

I have two computers and I use them both a lot. They are both for work. I have Input Defender to allow me to use my mouse on both screens. Unfortunately, quite often my laptop seems to boot up and isn't connected to the network at all. I have to restart it and / or just wait til it decides to connect. Sometimes hours.

How can I figure out why it's not connecting to the the network and / or internet.

thanks...


My System SpecsSystem Spec
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23 Nov 2009   #2

7600.20510 x86
 
 

Hi. First thing to do is disable any firewall, including Windows Firewall if that's what you are running...to test.

Then run Wireshark and you can see all the communications that your network adapter is doing.

If it's calling out for an ip address from the router and receives no response, you can see that. Then you can take things from there to try and figure out why.
My System SpecsSystem Spec
24 Nov 2009   #3

 
 

OK, thanks.. I guess i'll have to wait for it to happen again. The minute I went to troubleshoot it after your message yesterday the network popped up
My System SpecsSystem Spec
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24 Nov 2009   #4

Windows 7 Professional 64bit
 
 

Thanks for the wireshark a very handy program indeed.
My System SpecsSystem Spec
24 Nov 2009   #5

 
 

OK, so I ran wireshark and pressed Capture... still not connected, doesn't seem to be monitoring anyting but it says Capture In Progress at the bottom...
My System SpecsSystem Spec
25 Nov 2009   #6

Windows 7 Ultimate
 
 

Hi

I am new to SevenForums. I have been googling a issue I am having and came accross the forum.

Sounds to be a very similar issue as you describe.

I have a Broadcom 802.11g Wireless NIC using suggested windows drivers. Most of the time I can connect to the Wireless network with no troubles, internet works fine with good speed etc.
My issue is that sometimes out the network connection will have limited connectivity. If I disconnect from the Network and try to re-connect to the network I keep getting message that Windows is unable to connect to the wireless network. Running throught the troubleshooter suggests that I need to reset the router, which I know is not the problem becuase my other computer running XP connects fine.

I have tried the obvoious things. Restart the computer. Uninstall the NIC and re-install. Tried different drivers. Reset the router.

I don't think the NIC is faulty as it works sometimes.

What is even more bizarre, if I leave it for a couple of hours and check again the connection will be fully restored.

I have spent hours trying to get to the bottom of this, but no luck.
Any help would be appreciated.
My System SpecsSystem Spec
25 Nov 2009   #7

Windows 7 Pro x64 (dual-booting XPSP3 and Win7)
 
 

Quote   Quote: Originally Posted by dragotron View Post
OK, so I ran wireshark and pressed Capture... still not connected, doesn't seem to be monitoring anyting but it says Capture In Progress at the bottom...
Hi;
Wireshark is a great program, but I would not try to use it to troubleshoot if you don't already know your way around with it. It's complex and will probably raise more questions than it answers. Get up to speed with it on a computer that is functioning.

Start with the basics, and try "divide and conquer" if possible. What do you get from ipconfig /all? Are you getting a DHCP lease? Have you verified the NIC driver is fully up-to date? (I assume it is wired). Is the switch and the NIC both set to auto? Do you have another computer you can plug into the end of the cable and compare?

Raargh
My System SpecsSystem Spec
25 Nov 2009   #8

7600.20510 x86
 
 

Set the DHCP lease time to expire after the longest period of time it allows, on the router.

That's why Windows suggested you reboot it in the first place. It couldn't renew the lease. So if you set it to something like 99 days, fixed.

Better than all of that is to assign a static ip for the wireless adapter in Windows.
My System SpecsSystem Spec
25 Nov 2009   #9

Windows 7 Pro x64 (dual-booting XPSP3 and Win7)
 
 

Quote   Quote: Originally Posted by Scorp View Post
Hi

I have a Broadcom 802.11g Wireless NIC using suggested windows drivers... Most of the time I can connect to the Wireless network with no troubles, internet works fine with good speed etc.
My issue is that sometimes out the network connection will have limited connectivity.
What is even more bizarre, if I leave it for a couple of hours and check again the connection will be fully restored.
I'd stick with the latest Broadcom driver for Windows 7 for your specific nic, from the Broadcom website. Make sure the Wireless setting is "Infrastructure Only", not "Ad Hoc". 802.11g runs in the 2.4 GHz band and it is possible you are getting interference from other devices.

Wireless is complex, but very interesting. Here's a link to some tools that will get you started on being able to see more details:

NetStumbler for Windows 7 at WLAN Book.com

Is the computer a laptop? What brand and model router? Have you tried looking at the logs on the router? What about the Windows 7 event logs? Any errors or warnings?

Raargh
My System SpecsSystem Spec
25 Nov 2009   #10

7600.20510 x86
 
 

NetStumbler does not work on 7. Vistumbler does. At least that's what users reported.

I think NetStumbler works in compatibility mode for XP. SP2
My System SpecsSystem Spec
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