XP: No DNS Setting in IPCONFIG
in [Network and Web]
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From: Felix on 11 May 2010 20:24 Running Windows XP SP3 on HP7900 PC. Not apart of a domain (WORKGROUP) and is only intended for access to the Internet only and serve apps that are installed. I have 7 - 8 lab PCs that specifically do not list DNS servers in IPCONFIG and their OS network settings are set to 'Obtain DNS server address automatically'. Same for DHCP settings (automatic). Network Admins have been notified but they point to local PC being issue. I can ping the DNS server IP Addresses listing on a neighboring known working PC and I can ping 127.0.0.1, but I can't ping IP Address nor name of basic websites like yahoo.com and google.com. This is what I've done thus far... 1. On all PCs reported no longer showing DNS settings in IPCONFIG, they have a FIVE minute DHCP lease window as opposed to known working student lab PCs who's leases expire every seven days. 2. NSLOOKUP results on reported faulty lab PCs is 'Default servers are not available'. 3. Cross-checked faulty PCs HOST file with known working lab PCs HOST file and all is in order. 4. Cross-checked faulty PCs browser Internet Options with known working lab PC. They both mirror one another. 5. Swapped a reported faulty lab PCs CAT5 from wall jack and plugged into an adjacent known working lab PC's wall jack (RJ-45). The faulty lab PC still would not resolve website names after reboot. Still no DNS settings in IPCONFIG. Plugged known working student lab PCs CAT5 into faulty PCs old wall jack and the known working lab PC still successfully resolves website names in IE8 and DNS settings promptly list in IPCONFIG. Same results on 2 - 3 other reported faulty lab PCs that do not have DNS settings. Isolated issue to local PC(s). 6. Issue was prevalent since late last week. I ran System Restore from a week or more ago. After reboot, still no DNS. 7. Ran Malwarebytes full virus scan overnight. Found and removed six viruses. Reboot and issue still exists. 8. Reset IP stack as well as uninstalled/reinstalled NIC...no results either. 9. Safe Mode with Networking yields same results. 10. Ran Winsock and LSP Fix. Neither results corrected issue. LSP app actually listed files that it generated as 'No Problems Found'. Still no result after reboot. 11. Attempted to manually enter DNS IP addresses statically into OS...still did not take. Reboot, no success. Network connectivity icon in lower right of monitor on faulty PCs always display 'Speed: 100.0 Mbps'/'Status: Connected' Any ideas or suggestions would be greatly appreciated!
From: John Wunderlich on 12 May 2010 00:19 =?Utf-8?B?RmVsaXg=?= <Felix(a)discussions.microsoft.com> wrote in news:14285959-76FD-4661-887A-1C87F828F33C(a)microsoft.com: > Running Windows XP SP3 on HP7900 PC. Not apart of a domain > (WORKGROUP) and is only intended for access to the Internet only > and serve apps that are installed. I have 7 - 8 lab PCs that > specifically do not list DNS servers in IPCONFIG and their OS > network settings are set to 'Obtain DNS server address > automatically'. Same for DHCP settings (automatic). Network Admins > have been notified but they point to local PC being issue. I can > ping the DNS server IP Addresses listing on a neighboring known > working PC and I can ping 127.0.0.1, but I can't ping IP Address > nor name of basic websites like yahoo.com and google.com. > > This is what I've done thus far... > > 1. On all PCs reported no longer showing DNS settings in IPCONFIG, > they have a FIVE minute DHCP lease window as opposed to known > working student lab PCs who's leases expire every seven days. > > 2. NSLOOKUP results on reported faulty lab PCs is 'Default servers > are not available'. > > 3. Cross-checked faulty PCs HOST file with known working lab PCs > HOST file and all is in order. > > 4. Cross-checked faulty PCs browser Internet Options with known > working lab PC. They both mirror one another. > > 5. Swapped a reported faulty lab PCs CAT5 from wall jack and > plugged into an adjacent known working lab PC's wall jack (RJ-45). > The faulty lab PC still would not resolve website names after > reboot. Still no DNS settings in IPCONFIG. Plugged known working > student lab PCs CAT5 into faulty PCs old wall jack and the known > working lab PC still successfully resolves website names in IE8 > and DNS settings promptly list in IPCONFIG. > > Same results on 2 - 3 other reported faulty lab PCs that do not > have DNS settings. > > Isolated issue to local PC(s). > > 6. Issue was prevalent since late last week. I ran System Restore > from a week or more ago. After reboot, still no DNS. > > 7. Ran Malwarebytes full virus scan overnight. Found and removed > six viruses. Reboot and issue still exists. > > 8. Reset IP stack as well as uninstalled/reinstalled NIC...no > results either. > > 9. Safe Mode with Networking yields same results. > > 10. Ran Winsock and LSP Fix. Neither results corrected issue. LSP > app actually listed files that it generated as 'No Problems > Found'. Still no result after reboot. > > 11. Attempted to manually enter DNS IP addresses statically into > OS...still did not take. Reboot, no success. > > Network connectivity icon in lower right of monitor on faulty PCs > always display 'Speed: 100.0 Mbps'/'Status: Connected' > > Any ideas or suggestions would be greatly appreciated! > > Very thorough post. First, check the obvious: Start->Run->"services.msc" Then check the list and make sure that "DHCP Client" and "DNS Client" are both present and the status is listed as "Started" and Startup Type is "Automatic". If that checks out, then you must then realize that the DNS Servers are assigned by the DHCP server. The fact that your DHCP lease is only 5 minutes is potentially another indication that something is wrong with your DHCP assignment by the server. At this point I would determine whether this is a DHCP server issue or a Windows issue by booting your machine to Linux. Create a free Live Linux CD (such as Knoppix) and boot your machine from the CD. If the machine boots and properly registers a DNS server, then you have a Windows problem. If not, you probably have a DHCP server problem. Knoppix: <http://www.knopper.net/knoppix/index-en.html> Another thing you can try is to install a packet capture program like freeware "Wireshark". Then bring up a command window (Start->Run->Cmd) and release your current IP with the command: ipconfig /release Then start a packet capture with Wireshark and initiate a DHCP acquisition request by entering the following command in the command window: ipconfig /renew You can stop the capture a few seconds after the command. Try this on both a good and bad machine. You will be able to see the DNS assignment in the packet captures (or not). Wireshark will decode the fields for you. Look for "DHCP" in the "Protocol" column in the capture. Wireshark: <http://www.wireshark.org> Good luck. Hope this helps, John
From: Felix on 12 May 2010 00:36 ....oh and I must add that the OS firewall is turned off and we're using Symantec Endpoint Protection v11. "Felix" wrote: > Running Windows XP SP3 on HP7900 PC. Not apart of a domain (WORKGROUP) and is > only intended for access to the Internet only and serve apps that are > installed. I have 7 - 8 lab PCs that specifically do not list DNS servers in > IPCONFIG and their OS network settings are set to 'Obtain DNS server address > automatically'. Same for DHCP settings (automatic). Network Admins have been > notified but they point to local PC being issue. I can ping the DNS server IP > Addresses listing on a neighboring known working PC and I can ping 127.0.0.1, > but I can't ping IP Address nor name of basic websites like yahoo.com and > google.com. > > This is what I've done thus far... > > 1. On all PCs reported no longer showing DNS settings in IPCONFIG, they have > a FIVE minute DHCP lease window as opposed to known working student lab PCs > who's leases expire every seven days. > > 2. NSLOOKUP results on reported faulty lab PCs is 'Default servers are not > available'. > > 3. Cross-checked faulty PCs HOST file with known working lab PCs HOST file > and all is in order. > > 4. Cross-checked faulty PCs browser Internet Options with known working lab > PC. They both mirror one another. > > 5. Swapped a reported faulty lab PCs CAT5 from wall jack and plugged into an > adjacent known working lab PC's wall jack (RJ-45). The faulty lab PC still > would not resolve website names after reboot. Still no DNS settings in > IPCONFIG. Plugged known working student lab PCs CAT5 into faulty PCs old wall > jack and the known working lab PC still successfully resolves website names > in IE8 and DNS settings promptly list in IPCONFIG. > > Same results on 2 - 3 other reported faulty lab PCs that do not have DNS > settings. > > Isolated issue to local PC(s). > > 6. Issue was prevalent since late last week. I ran System Restore from a > week or more ago. After reboot, still no DNS. > > 7. Ran Malwarebytes full virus scan overnight. Found and removed six > viruses. Reboot and issue still exists. > > 8. Reset IP stack as well as uninstalled/reinstalled NIC...no results either. > > 9. Safe Mode with Networking yields same results. > > 10. Ran Winsock and LSP Fix. Neither results corrected issue. LSP app > actually listed files that it generated as 'No Problems Found'. Still no > result after reboot. > > 11. Attempted to manually enter DNS IP addresses statically into OS...still > did not take. Reboot, no success. > > Network connectivity icon in lower right of monitor on faulty PCs always > display 'Speed: 100.0 Mbps'/'Status: Connected' > > Any ideas or suggestions would be greatly appreciated! >
From: Felix on 12 May 2010 22:23 John: I've been informed by my lab tech that ALL lab PCs in question are working at 100% Internet Connectivity. DNS resolves. I have done nothing to PCs since my last email to you. Network Admins are asking me what I've done and I'm afraid they've done things on the back end that they're not telling use field techs. They'd never own up to it if that was the case. Administration just want PCs working and they are now. Neither I nor Admins (that they'll admit) did ANYTHING to resolve. Then, miraculously, overnight it's resolved. I mean, the PCs did not work no matter what RJ-45 jack we plugged into...but the known working PCs connect to Internet flawlessly. I can only imagine that it's MAC Address/IP Address issue?!?! Other than that, I did notice that one PCs Symantec EndPoint Protection (SEP) v11 client was grossly out of date. All lab PCs last reimaged January 2010. Other than standard egos that go along with the job of IT, any thoughts based on what I've described transpired in 24hours, on what could have resolved DNS settings reappearing, John or anyone reading this post? "John Wunderlich" wrote: > =?Utf-8?B?RmVsaXg=?= <Felix(a)discussions.microsoft.com> wrote in > news:14285959-76FD-4661-887A-1C87F828F33C(a)microsoft.com: > > > Running Windows XP SP3 on HP7900 PC. Not apart of a domain > > (WORKGROUP) and is only intended for access to the Internet only > > and serve apps that are installed. I have 7 - 8 lab PCs that > > specifically do not list DNS servers in IPCONFIG and their OS > > network settings are set to 'Obtain DNS server address > > automatically'. Same for DHCP settings (automatic). Network Admins > > have been notified but they point to local PC being issue. I can > > ping the DNS server IP Addresses listing on a neighboring known > > working PC and I can ping 127.0.0.1, but I can't ping IP Address > > nor name of basic websites like yahoo.com and google.com. > > > > This is what I've done thus far... > > > > 1. On all PCs reported no longer showing DNS settings in IPCONFIG, > > they have a FIVE minute DHCP lease window as opposed to known > > working student lab PCs who's leases expire every seven days. > > > > 2. NSLOOKUP results on reported faulty lab PCs is 'Default servers > > are not available'. > > > > 3. Cross-checked faulty PCs HOST file with known working lab PCs > > HOST file and all is in order. > > > > 4. Cross-checked faulty PCs browser Internet Options with known > > working lab PC. They both mirror one another. > > > > 5. Swapped a reported faulty lab PCs CAT5 from wall jack and > > plugged into an adjacent known working lab PC's wall jack (RJ-45). > > The faulty lab PC still would not resolve website names after > > reboot. Still no DNS settings in IPCONFIG. Plugged known working > > student lab PCs CAT5 into faulty PCs old wall jack and the known > > working lab PC still successfully resolves website names in IE8 > > and DNS settings promptly list in IPCONFIG. > > > > Same results on 2 - 3 other reported faulty lab PCs that do not > > have DNS settings. > > > > Isolated issue to local PC(s). > > > > 6. Issue was prevalent since late last week. I ran System Restore > > from a week or more ago. After reboot, still no DNS. > > > > 7. Ran Malwarebytes full virus scan overnight. Found and removed > > six viruses. Reboot and issue still exists. > > > > 8. Reset IP stack as well as uninstalled/reinstalled NIC...no > > results either. > > > > 9. Safe Mode with Networking yields same results. > > > > 10. Ran Winsock and LSP Fix. Neither results corrected issue. LSP > > app actually listed files that it generated as 'No Problems > > Found'. Still no result after reboot. > > > > 11. Attempted to manually enter DNS IP addresses statically into > > OS...still did not take. Reboot, no success. > > > > Network connectivity icon in lower right of monitor on faulty PCs > > always display 'Speed: 100.0 Mbps'/'Status: Connected' > > > > Any ideas or suggestions would be greatly appreciated! > > > > > > Very thorough post. > > First, check the obvious: > > Start->Run->"services.msc" > Then check the list and make sure that "DHCP Client" and "DNS Client" > are both present and the status is listed as "Started" and Startup Type > is "Automatic". > > If that checks out, then you must then realize that the DNS Servers are > assigned by the DHCP server. The fact that your DHCP lease is only 5 > minutes is potentially another indication that something is wrong with > your DHCP assignment by the server. At this point I would determine > whether this is a DHCP server issue or a Windows issue by booting your > machine to Linux. Create a free Live Linux CD (such as Knoppix) and > boot your machine from the CD. If the machine boots and properly > registers a DNS server, then you have a Windows problem. If not, you > probably have a DHCP server problem. > > Knoppix: <http://www.knopper.net/knoppix/index-en.html> > > Another thing you can try is to install a packet capture program like > freeware "Wireshark". Then bring up a command window (Start->Run->Cmd) > and release your current IP with the command: > ipconfig /release > Then start a packet capture with Wireshark and initiate a DHCP > acquisition request by entering the following command in the command > window: > ipconfig /renew > You can stop the capture a few seconds after the command. > > Try this on both a good and bad machine. You will be able to see the > DNS assignment in the packet captures (or not). Wireshark will decode > the fields for you. Look for "DHCP" in the "Protocol" column in the > capture. > > Wireshark: <http://www.wireshark.org> > > Good luck. > Hope this helps, > John > > . >
From: Jack [MVP-Networking] on 13 May 2010 12:32
Hi It is kind of useless to even speculate. Since the connection is part of an central system there are many simple setting that can be On/Off, or changed in the central system that will result in Not being able to connect. The whole issue is Not necessarily a result of malice it can be a result of a simple mistake done by a tech guy that was not even aware of it, and then too proud to admit. Jack (MS, MVP-Networking). "Felix" <Felix(a)discussions.microsoft.com> wrote in message news:337FB304-ED92-45FC-9CC8-F2640D5FC89C(a)microsoft.com... > ...oh and I must add that the OS firewall is turned off and we're using > Symantec Endpoint Protection v11. > > "Felix" wrote: > >> Running Windows XP SP3 on HP7900 PC. Not apart of a domain (WORKGROUP) >> and is >> only intended for access to the Internet only and serve apps that are >> installed. I have 7 - 8 lab PCs that specifically do not list DNS servers >> in >> IPCONFIG and their OS network settings are set to 'Obtain DNS server >> address >> automatically'. Same for DHCP settings (automatic). Network Admins have >> been >> notified but they point to local PC being issue. I can ping the DNS >> server IP >> Addresses listing on a neighboring known working PC and I can ping >> 127.0.0.1, >> but I can't ping IP Address nor name of basic websites like yahoo.com and >> google.com. >> >> This is what I've done thus far... >> >> 1. On all PCs reported no longer showing DNS settings in IPCONFIG, they >> have >> a FIVE minute DHCP lease window as opposed to known working student lab >> PCs >> who's leases expire every seven days. >> >> 2. NSLOOKUP results on reported faulty lab PCs is 'Default servers are >> not >> available'. >> >> 3. Cross-checked faulty PCs HOST file with known working lab PCs HOST >> file >> and all is in order. >> >> 4. Cross-checked faulty PCs browser Internet Options with known working >> lab >> PC. They both mirror one another. >> >> 5. Swapped a reported faulty lab PCs CAT5 from wall jack and plugged into >> an >> adjacent known working lab PC's wall jack (RJ-45). The faulty lab PC >> still >> would not resolve website names after reboot. Still no DNS settings in >> IPCONFIG. Plugged known working student lab PCs CAT5 into faulty PCs old >> wall >> jack and the known working lab PC still successfully resolves website >> names >> in IE8 and DNS settings promptly list in IPCONFIG. >> >> Same results on 2 - 3 other reported faulty lab PCs that do not have DNS >> settings. >> >> Isolated issue to local PC(s). >> >> 6. Issue was prevalent since late last week. I ran System Restore from a >> week or more ago. After reboot, still no DNS. >> >> 7. Ran Malwarebytes full virus scan overnight. Found and removed six >> viruses. Reboot and issue still exists. >> >> 8. Reset IP stack as well as uninstalled/reinstalled NIC...no results >> either. >> >> 9. Safe Mode with Networking yields same results. >> >> 10. Ran Winsock and LSP Fix. Neither results corrected issue. LSP app >> actually listed files that it generated as 'No Problems Found'. Still no >> result after reboot. >> >> 11. Attempted to manually enter DNS IP addresses statically into >> OS...still >> did not take. Reboot, no success. >> >> Network connectivity icon in lower right of monitor on faulty PCs always >> display 'Speed: 100.0 Mbps'/'Status: Connected' >> >> Any ideas or suggestions would be greatly appreciated! >> |