MrPstv Posted April 13, 2015 Posted April 13, 2015 (edited) This problem is very random with respect to when and where it happens. Server 2008 R2 Windows 7 Issue as follows: Log onto a workstation as a user or administrator. Network and sharing icon has red X through it. When the automatic Microsoft problem solver finishes trying to fix it a DNS error is displayed. Can browse network but slow to resolve other devices on the network. No internet access at all. Proxy settings are happy! My fix is to reset the network adapter using the command prompt and restart it. Why would this be happening? Any ideas please.... Edited April 13, 2015 by MrPstv
mowgli82 Posted April 13, 2015 Posted April 13, 2015 when you ipconfig /all does it show two default gateways? if you have apple software installed and the adapter doesn't connect to your network first the apple service enters a route of 0.0.0.0. I've seen this on a couple of machines that haven't been able to get on the net. route delete 0.0.0.0 normally brings it all back to life
Michael Posted April 13, 2015 Posted April 13, 2015 If resetting the adapter works, try updating the NIC drivers.
MrPstv Posted April 13, 2015 Author Posted April 13, 2015 If resetting the adapter works, try updating the NIC drivers. They have the latest drivers from HP website... Michael, Not all the workstations behave in this manner, they all have the same driver... Exact message after trouble shooting has completed: The DNS server isn't responding Detected
Michael Posted April 13, 2015 Posted April 13, 2015 What adapter is it? If it's an Intel, go to their website directly. HP don't always host the latest drivers. Even if your machines are built from the same image, I'd still try updating the drivers on the affected workstations or servers. 1
MrPstv Posted April 13, 2015 Author Posted April 13, 2015 Ok, Just had a nosey on the Intel website and yes they have updated drivers. I will download and install when time permits.. or apply when this happens again.. Thanks again..
MrPstv Posted April 27, 2015 Author Posted April 27, 2015 DNS problems have re-surfaced.. Issues: Can browse network No internet Have updated drivers on the few machines this is affecting and it is the same after a while I have disconnected the patch cable and reconnected it and this seems to resolve the dns issue. So this makes me wonder if it is a dns issue server side. I read something regarding ip addresses and scavenging stale resource records. Your thoughts please....
tmcd35 Posted April 27, 2015 Posted April 27, 2015 My first thought, right or wrong, is an IP address conflict. Not sure where to point you to as a cause or solution though if all IP addresses are provided by DHCP other than to check for manually assigned IPs are not in the DHCP range ot otherwise already assigned to another device. DHCP should notice addresses already in use and mark them as bad address rather than allocate them. Still if it is that then it may point to a problem with stale records and scavenging. If DHCP is somehow scavenging records, thinking they are now re-allocatable, while the client thinks it still has time left on its lease?
Michael Posted April 27, 2015 Posted April 27, 2015 Have you properly configured DNS Forwarders in DNS Server? Are proxy settings applied? Can you browse to bgfl.org which is an intranet site, rather than internet? If you can't visit bbc.co.uk can you ping it?
MrPstv Posted April 27, 2015 Author Posted April 27, 2015 Have you properly configured DNS Forwarders in DNS Server? Are proxy settings applied? Can you browse to bgfl.org which is an intranet site, rather than internet? If you can't visit bbc.co.uk can you ping it? Proxy settings applying. This is definitely an ip address issue.. The next time it happens i will check the intranet access.
Michael Posted April 27, 2015 Posted April 27, 2015 Modern versions of Windows are normally pretty good at telling you there's an IP conflict. If you have more than one DHCP instance, do you have conflict detection enabled? I'm not convinced it's an IP issue, simply because you can still browse the network and ping other static devices presumably? An easy thing to try is to reset the DNS Server service on each server in turn. The other possibility is your network switches could be failing - especially if you're still using the Cisco's that Service Birmingham installed all those years ago. The Cisco 3560 has long been retired and should be replaced with faster Gigabit switches.
MrPstv Posted April 27, 2015 Author Posted April 27, 2015 Modern versions of Windows are normally pretty good at telling you there's an IP conflict. If you have more than one DHCP instance, do you have conflict detection enabled? I'm not convinced it's an IP issue, simply because you can still browse the network and ping other static devices presumably? An easy thing to try is to reset the DNS Server service on each server in turn. The other possibility is your network switches could be failing - especially if you're still using the Cisco's that Service Birmingham installed all those years ago. The Cisco 3560 has long been retired and should be replaced with faster Gigabit switches. We have HP v1910 switches. Link2ict's core switch is still the old Cisco unit..
MrPstv Posted April 27, 2015 Author Posted April 27, 2015 Have you tried restarting your switches? Will give it a try in the morning,
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