I have had the same wireless network setup for years (3 Linksys routers, two of which are configured as APs). All of a sudden, one of my notebooks (Win 7, 64 bit) can no longer connect. All my other machines (several notebooks of different types and makes) still connect just fine.
Symptoms:
- After boot, network no longer auto connects.
- In the network connections, the network still sometimes (very infrequently) appears in the network list, but when trying to mouse to it to connect the network disappears from the list.
What I have already tried:
- moved the boot disk to a different machine (same hardware, both Dell Lattitude D830, Intel 3495ABG). Same problem, so does not seem hardware related.
- System restore to day before (when things worked fine) as there were some Windows updates (0ct 27 2010), problem remains
- removed network from wireless network list, problem stays
- manually re-added network, did not solve problem
- remove wireless device through device manager. Shows up again after reboot, same problem
- Disable IPV6 on the adapter, no change.
- install new driver (from Intel site), problem remains
- reset IP & winsock through netsh, problem remains
- clear out all network cache entries from registry, no difference
Anything else I could try before throwing in the towel and reinstalling?
EDIT: Interesting. When I am connected to the wired network by an Ethernet cable (different network adapter, by Broadcomm), the wireless network does show up and I can even connect to it and stay connected even when I remove the wired network cable and roam the house from AP to AP. However, when I start up not connected by wired cable, the wireless problem is still as described above.
UPDATE I can get the networks to show up by restarting the WLAN Autoconfig service, then disabling and re-enabling the adapter. Unfortunately the machine tends to lose the network again after a while (can be minutes to hours).
UPDATE The issue seems to have disappeared as mysteriously as when it appeared. Getting a new machine shortly, so I will drop the case for now unless new info turns up.
Best Answer
It could be a power issue see this link (Microsoft forum)
"If you are having a problem with your wireless connection after resuming from hibernate or sleep, or are having intermittent connectivity issues, try to adjust your Power Management profile to change your Wireless Adapter Settings to Maximum Performance. a. To do this click “Change Plan Settings” next to your Power Profile, and choose “Wireless Adapter Settings” and set it to Maximum Performance. You should do this with all of your power profiles. Additional guidance is available here: http://windows.microsoft.com/en-us/windows7/products/features/power-management "