I have looked at a number of forums and sites for an answer to this question, but all the suggested remedies have had no impact. At some time in the recent past, my local network has dropped out and while all computers on the network can still access the internet, they cannot connect to each other, as the Network and Sharing Centre show no network connection. The network map shows the other computers but shows no connection between the modem/router and router/internet. I am running W7 64bit with an onboard network adaptor, cable modem and 4-port/wireless router (Linksys WRT54G2) I have uninstalled/reinstalled the network card, disabled the firewall and anti-virus protection, manually entered the LAN settings, reinstalled/updated drivers for the modemand router, but nothing is helping. I have yet to uninstall any Windows updates or reinstall W7, which seem to be the last resorts. Any other suggestions?

Hi, You may try to test if this issue persists in Safe Mode with Networking. If this issue does not occur in Safe Mode, please boot into Clean Boot mode to check the result. Also, check whether this issue only occurred with this network environment. Regards, Vincent Wang TechNet Community Support

Thanks for the reply I have rebooted the computer in safe mode with networking but the problem still remains The other computers on the network can communicate with each other and can see my computer. I can see these computers but cannot communicate with them.

I have just spent an excruciating week + supporting a client with the same issue over production W7 Laptops running Ultimate x64. Their problem related to Updates KB2750841 and KB2735855 and maybe ESET Nod32, they also operate DirectAccess. We backed out of the patches on the 2008 R2 servers but this did not have any impact. Applying Hotfix KB2789397 to the Laptops fixed the issue http://support.microsoft.com/kb/2789397?wa=wsignin1.0. According to an ESET article there are similar problems with W8 but no patch yet. The ESET problem (initially reported to MS by ESET in November according to their moderator on Wilders Security Forums http://www.wilderssecurity.com/showthread.php?t=332920). ESET knowledgebase article http://kb.eset.com/esetkb/index?page=content&id=SOLN3145&pmv=print&impressions=false specifically relates to downloading their updates but we found connectivity problems previously experienced pre W7 SP1 had returned with connectivity deteriorating a few weeks after the patches KB2750841 and KB2735855 had been applied, eventually resulting in no domain access at all as the wrong firewall policies were being applied by W7. Hotfix KB2789397 acted like an antibiotic and once the Laptops had re-synchrionised their policies and files all was well again and I have just had my first good nights sleep in a week.BobK ;)

I have just spent an excruciating week + supporting a client with the same issue over production W7 Laptops running Ultimate x64. Their problem related to Updates KB2750841 and KB2735855 and maybe ESET Nod32, they also operate DirectAccess. We backed out of the patches on the 2008 R2 servers but this did not have any impact. Applying Hotfix KB2789397 to the Laptops fixed the issue http://support.microsoft.com/kb/2789397?wa=wsignin1.0. According to an ESET article there are similar problems with W8 but no patch yet. The ESET problem (initially reported to MS by ESET in November according to their moderator on Wilders Security Forums http://www.wilderssecurity.com/showthread.php?t=332920). ESET knowledgebase article http://kb.eset.com/esetkb/index?page=content&id=SOLN3145&pmv=print&impressions=false specifically relates to downloading their updates but we found connectivity problems previously experienced pre W7 SP1 had returned with connectivity deteriorating a few weeks after the patches KB2750841 and KB2735855 had been applied, eventually resulting in no domain access at all as the wrong firewall policies were being applied by W7. Hotfix KB2789397 acted like an antibiotic and once the Laptops had re-synchrionised their policies and files all was well again and I have just had my first good nights sleep in a week.BobK ;)