We have been seeing something similar off and on with our Win7 machines - the network & sharing center would show that we did not have a connection to the Internet, even though everything looked good in ipconfig /all and the system tray would have a warning symbol on the network icon. After some extensive internet research via google, I found a lot of possible causes...
1) It seems Vista and Win7 have some kind of "phone home" pinging mechanism that the OS uses to determine if it is reaching the Internet. If the sites or at least responses from those sites that the OS is looking for do not get returned to the workstation, then the OS assumes that it has no connection to the Internet, though internal connections to the LAN are fine. It is conceivable that a firewall/filter (such as IPCop) might be blocking the sites the OS is trying to hit to determine if it has Internet connectivity. If this is the case, it should show up in a wireshark trace but I have not tried it to confirm. 2) Some reported a specific issue with Symantec Endpoint Security (again, possibly related to Symantec's local firewall - we don't use Symantec so that was not our issue). 3) Apple's Bonjour service has been reported to cause this kind of activity (though it was not installed on the machines we were having issues with that I am aware of) 4) Problems with older versions of Intel's NIC drivers (ours were most recent, though) 5) Problems with IPv6. By default Vista and Win 7 have native support for both IPv6 and IPv4. If the rest of the network is only configured for IPv4 some have suggested disabling IPv6 on the client. This did the trick for us on one problematic workstation (running our access control software, which may also have been part of the problem). In our case this is very sporadic and seems to have pretty much gone away (maybe something fixed in a Windows update?). When it does occur, I have found that disabling and re-enabling the network connection seems to work. -TS -----Original Message----- From: tech-geeks-boun...@tech-geeks.org [mailto:tech-geeks-boun...@tech-geeks.org] On Behalf Of hay...@sages.us Sent: Saturday, September 11, 2010 10:07 AM To: Tech-Geeks Mailing List Subject: Re: [tech-geeks] Vista/7 not connecting to network For those of us who are using IPCop, it looks like it is time that we either find a solution for this issue - it arose in our district again last week with two new laptops running Windows 7 - or find a replacement for IPCop that does not have this issue. Now, if one of us comes up with a solution we need to agree so share........ Quoting Charlie Niehaus <cnieh...@altamont.k12.il.us>: > I have (soon had I hope) the same issue with Windows 7 and IPCop. > Never did find a solution. There are tohers that did not see the > issue with IPCop and Windows 7 - so I am assuming it is either a > configuration issue with IPCop (Best Bet) or somthing with a switch > along the way. i was lucky enough to solve it by giving the > computer in question an external IP and trusting the user (My > Superintendent) to not break any AUP rules. Not sure how that is > going though. > > ----- Original Message ----- From: "Jared Lynn" <jl...@porta202.org> > To: "Tech-Geeks Mailing List" <tech-geeks@tech-geeks.org> > Sent: Friday, September 10, 2010 12:19 PM > Subject: [tech-geeks] Vista/7 not connecting to network > > >> I'm hoping somebody on here has experienced this and has a solution >> to this very annoying problem. I have a couple of newly purchased >> windows 7 machines and a single vista machine that are trying to >> connect to get past my Router. DHCP hands out a valid IP and points >> to the right places but from there, the Default Gateway doesn't >> acknowledge that the machine exists. I can ping and access all >> internal servers but can not ping the Default Gateway. FYI, the >> Default Gateway is our CIPAFilter that has no problems with XP or >> OS X 10.6. Any comments or thoughts as to what might be occurring >> would be greatly appreciated. >> >> As always, You stay Classy Internet. >> Thanks, >> Jared Lynn >> PORTA CUSD #202 Technology Coordinator >> Email: jl...@porta202.org >> Phone: 217-501-4920 >> >> | Subscription info at http://www.tech-geeks.org | >> > > | Subscription info at http://www.tech-geeks.org | > | Subscription info at http://www.tech-geeks.org | | Subscription info at http://www.tech-geeks.org |
