This morning I was able to connect wirelessly to my router, this evening I am not. My machine is running Windows 7 64-bit Wireless adapter is Intel Centrino N-100 My Samsung Galaxy SII connects to the wireless router, in fact I'm using USB tethering to enable my laptop to connect to the router so I can type this. I've uninstalled and reinstalled the wireless adapter, uninstalled and reinstalled Microsoft Security Essentials, rebooted the router, rebooted my laptop etc. This has happened a few times before, but the laptop seemed to have fixed itself later on somehow. I did put my laptop in standby mode today by closing the lid on it, and I did read somewhere that Windows 7 acts funny when it goes into sleep mode and then wakes up; however I've restarted, shut down and rebooted the laptop many times since then. I've also ran Windows Update and installed some optional security updates. I've noticed that there are many threads which have been posted over the last three years over this issue, but I haven't found a viable solution yet, nor do I know what has caused the problem (network event logs just show how many times the troubleshooter ran). I do not believe that setting a static IP address will work - the laptop worked fine this morning without one, so it shouldn't need one this evening. Can anybody tell me what has happened between this morning and this evening that would have disabled my laptop's ability to connect to the router?

1. You should try things that you deny. What configuration has been in morning need not be the same day in evening. 2. More information is needed on the event and update logs. 3. Is IP addresses assigned properly? If not use static IP address and public DNS (like 8.8.8.8) 4. Disable firewall for test purposes. 5. Check log file on router. 6. If nothing helps, reset winsock. HTH Milos

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When you are not able to connect try running "ipconfig" and see if you do have an IP address assigned. If you don't then try following Check your services and if you find Bonjour disable it or at least set it to manual. Reset your TCPIP netsh int ip reset C:\resetlog.txt netsh winsock reset catalog http://windows7themes.net/repair-reset-winsock-windows-7.html Check the registry for the two keys below Hive HKEY_LOCAL_MACHINE Key path SYSTEM\CurrentControlSet\Services\Tcpip\Parameters Value name ArpRetryCount Value type REG_DWORD Value data 0 Value name DisableDHCPMediaSense Value type REG_DWORD Value data 0 Reboot your computer when you finish all steps above

Puchta's reply is funny - try things that I deny? What, you don't believe me? Lol. I forgot to mention that the laptop is an Asus K53E; in saying that however, I've noted from various other threads which describe this same problem that there are a variety of other brands and models involved. Well, the problem sorted itself out in the end - although I had rebooted the router many times remotely, turning it off for ten seconds seemed to do something. Note - the problem was not the router, because if it was then my Samsung Galaxy SII could not have been able to connect, but it was able and it was able to connect to the internet via the same router perfectly as I wrote in my original post. Now, before, during and after I physically turned the router off and on again, the laptop was still connected to the router via the Samsung Galaxy SII via USB tethering. The phone allowed my laptop to connect to the router. What happened on the laptop when the router was turned off and then turned on again was that the laptop behaved as it always had, only this time it actually connected to the wireless connection and then told me it was waiting to be assigned an IP. Then, after a while, it connected normally and I was able to disconnect the phone from the laptop as the laptop was now connected to the router by itself. I do have the option of saying that the router might sometimes, because of some kind of corruption, deny some devices an IP and not others - but I don't think that this is the problem. I think that the problem lies with the wireless adapter on the laptop, and I think that the adapter can't sort itself out until the router is physically turned off and on again and starts doling out IP addresses to all devices on the network.

Hi, It seems that issue has been resolved. If so, can we consider to archive this thread? However, if you still have concern about the issue, please feel free to let us know. Best Regards. Jeremy Wu TechNet Community Support

Hi Jeremy The issue has indeed been resolved for now.

Hi, Thanks for the update. If there is anything we could help in the feture, welcome back to our forum. Best Regards. Jeremy Wu TechNet Community Support