Third party security software blocks the network connection. 
The driver of the NIC card on the machine is out of date. The firmware of the router is out of date. The router or device does not support the Vista DHCP BROADCAST flag. For your reference, I would like to share the possible causes of this kind of issue collected so far: Generally speaking, the " Unidentified Network" issue could be related hardware, application compatibility issue, or network configurations. Link Layer Topology Discovery Protocol Specification Network Connectivity Status Indicator and Resulting Internet Communication in Windows Vista If everything works correctly, we can see the network topology related information there.įor more information, you may refer to the following article: Windows Vista introduces two new features, Link Layer Topology Discovery Protocol (LLTD) and Network Connectivity Status Indicator (NDSI), to display more information in "Network and Sharing Center". One is still on the network and working while another will not get on anymore.Īny other sugestions on where to look or what we might do to correct the error without having people loose all their data and program installs every month would be greatly appreciated. It has become a nightmare for technical support. 
This will occur while Norton, Mcafee, AVG, TrendMicro, Kapersky, and other protection is installed. They will not be able to get back online until the unit is reloaded.
Then when the more able users check the network it will say "unidentified network" and "local access only". Some reports are while the user is on the internet just surfing it will suddenly go dead. We have over 750 agents tracking this error and keeping notes for over 4 months with no real pattern detected so far. No rhyme or reason or specific update has been found so far. Only by doing a complete reload does the wireless begin to work again untill it starts doing updates from Microsoft. Other parts of the troubleshooting tree have been the typical ipconfig commands, resetting the winsock, removing updates, changing to static IP, router reset, firmware upgrading, replacing the router, replacing the wireless nic card, updating drivers, and removing updated drivers. I have tried it several times as part of the overall troubleshooting.
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