With wireless security protocols, the key will be periodically renegotiated or the signal strength will fade, causing a loss of network connectivity.
Of course, you can lose network connectivity on any type of network. Here you should find a wireless connection with a valid Internet connection. Figure 1: Good Wireless Network Connection. Notice how the Access is Local and Internet.
This brings me to my next point. Make sure that you have a valid IP address on your network. Again, if you have a Here is what it looks like:. Once you know that you have network connectivity and a valid IP address, let us move on to digging deeper into DNS by verifying that your DNS Server IP addresses are correct and are in the right order.
This is how it works on most enterprise networks. However, your DNS servers do not always have to be on your subnet. Finally, make sure that your DNS Servers are in the right order. It is configured to forward any names that it cannot resolve to That brings me to two more points. First, make sure that your DNS Servers are in the right order. A quick way to prove that it is a DNS issue and not a network issue is to ping the IP address of the host that you are trying to get to.
I know that if your DNS Server is not functioning then it could be hard to figure out what the IP address is that you want to connect to. Thus, to carry out this test, you would have to have a network diagram or, like many network admins do, just have the IP address of a common host memorized.
If this works, until the DNS server is available again, you could manually put an entry in your hosts file to map the IP to the hostname. You can use the nslookup command to find out a ton of information about your DNS resolution.
Here is my nslookup of www. Figure 5: nslookup output. You can also use nslookup to compare the responses from different DNS servers by manually telling it which DNS server to use. You should have your network adaptor configured with the connection specific DNS suffix , as shown on the first line on the graphic above, labeled Figure 1. Notice how in that graphic my DNS suffix is wiredbraincoffee. While you can do this with a Windows Diagnosis in your network configuration, I like to do it in the command prompt.
If you have UAC enabled, make sure you run the Windows cmd prompt as administrator then do:. Answered by:. Archived Forums. Windows 7 Networking. Sign in to vote. I have a user with Win 7 Enterprise x64 on his D laptop. Suddenly, his wireless stopped working. He cannot browse anywhere though. This happens on our company networks and his personal network at home. Wired connection works just fine. Only the wireless has this issue. We have updated all drivers, swapped the mini-PCI wireless card for a known good one, disabled IPv6, deleted all profiles and recreated Ping by IP Tried Firefox and IE for browsing, same issue.
Nothing in the network adapter properties shows any different to a fully functional D with Win7 x64 next to it. Any ideas? Thanks Ross. Friday, March 5, PM. I'll point out again that this is a common symptom of a malware infection - DNS hijacking.
It's possible that only the network interface in use while the infection occurs is affected. Scanning the computer from Windows can be a waste of time. Neither Sophos nor MalwareBytes will detect some root kits if the root kit is active. The only way to be sure it's not malware related is to scan from a Linux CD or remove the hard drive and scan it with another computer.
Some of the current root kits cannot be scanned from Windows even with supposed "root kit" scanners. As the laptop has been used outside of your cororate network malware is a possibility. I'd scan the hard drive from another computer just to be sure then I'd nuke the machine and start again just in case. Wednesday, March 10, PM.
Two things I would initially check. And, are there any errors in the Event Viewer? I'll have to look again in the Event Viewer when he gets into the office today, but the DNS client works for the wired connection just fine.
You can connect to the wireless system and be unable to browse, plug an ethernet cable in and off you go. I might be mistaken, but I don't believe each connection has its own instance of the DNS client. Monday, March 8, PM. That is often the symptom of a malware infection. Tuesday, March 9, AM. All wireless adapter settings match a fully functional device.
Firewall is off by default. Anti-virus being disabled made no difference. We have the latest drivers for the Dell wireless card installed also. This is why we thought it might be hardware failure at first. We checked the antenna connections and they were tight, so we swapped the card from another D that we know was working.
Same issue persisted. If DNS was totally hosed, it wouldn't work for the wired connection. It's odd that it only affects the wireless, and only DNS. Again, you can load a webpage by IP address, you just cannot resolve any of the links on that page. Disconnect from the wireless and plug in ethernet, and off you go.
Tuesday, March 9, PM. Wednesday, March 10, AM. We disconnect from the wired connection. Not a router issue as this is a corporate network Cisco ASA firewalls and Aruba wireless system. Wired connection is to a Cisco linked to a Cisco before the firewalls. It works fine for almost other users in the office, so it is machine specific. The firewall on the laptop is disabled by group policies on the domain also.
We have three different wireless networks on the Aruba system each using different VLANs for different layers of access and this unit will not work on any of the three. Also, the security method is different on each wireless network. Not sure what his setup at home is, but it does the same.
Wired works, wireless doesn't. I've pretty much tried all the suggestions prior and no luck. Just trying to avoid rekicking the system and migrating a lot of data, plus installation of apps that are not part of the standard image.
Friday, March 12, PM. The user has been traveling and is supposed to be back int he office this week. I'll get a disc to scan with from one of the lead techs on our Linux teams. I'm having this issue google chrome, and explorer.
I haven't had a chance to try mozilla because I cannot connect reliably to the internet to download it My connection is spotty, one minute I have a connection, the next it's gone, and I get that annoying yellow triangle with the exclamation mark over my wireless signal in my task bar..
I am having the same problem with my Google Chrome, but only Google Chrome browser. I had my proxy changed to a free proxy provider via Mozila FF the last time. With this PC I never change my proxy. Come on Google. Fix it. AminRoy : You would get better responses if you posted your issues in a thread that you create. Daisha M said:. That is definitely a start I've logged on to Dell, and searched "wifi device driver" with no luck I greatly appreciate your help thus far!
Most were modem updates, I didn't see anything for wifi specifically, but I still downloaded them and rebooted Still have the DNS issue. I can load a page sometimes if I reload it several times, but usually only the plain text comes through, pictures, photos, etc are missing Hmm; The DNS will only translate the domain name eg: techspot.
If the DNS value is missing or invalid ie unknown , then the browser would not be able to access TXT files in fact anything. COM and see this: Code:. You must log in or register to reply here.
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