Weird Problem, Stumped, DNS starts to fail after idle

12,517 · May 18, 2015

Ok, I have 2 brand new Dell Latitude 5550 laptops. One is used a Powerpoint/Presentation laptop and the other is used for digitally recording meetings.

Similaraties between both.

Running Windows 7 x64

On the same domain

Up to date via the same WSUS Server

Issue:

After the digital recording laptop has say for an undertermined amount of time idle, with a user logged on or not logged on and locked. The system will produce the following symptoms.

1: Cannot remote desktop into system, gives error "Remote Desktop cannot verify the identity of the remote computer because there is a time or date difference between your computer and the remote computer. Make sure your computer's clock is set to the.... blah blah"

2: NETLOGON - This computer was not able to set up a secure session with a domain controller in domain ORANGECITY due to the following:

There are currently no logon servers available to service the logon request.

3: GroupPolicy - The processing of Group Policy failed. Windows could not obtain the name of a domain controller. This could be caused by a name resolution failure. Verify your Domain Name System (DNS) is configured and working correctly.

4: During this time, when it is failing, I can login locally, and I can still access any pre-mapped drives, but I am unable to ping or resolve anything via DNS even with NSLOOKUP.

What I have tried that has had no change on issue.

Fresh load of the OS

Wired or Wireless connection, does not make a difference

Dynamic IP and Static IP (runs as a static IP normally, same static IP previous laptop it replaced was using)

Latest drivers, same as what the other laptop is running

Checked DNS on both DCs, entries are fine.

Disable IPV6 on both wired/wireless interfaces

Checked GPO issued power management settings, same as other laptop and previous

Checked time sync with DC, it is fine, time/date/timezone are all correct.

What is installed besides just Windows and latest drivers:

Microsoft Office 2007, same as other laptop

Trendmicro Office Scan, same as other laptop

Meraki (Cisco), same as other laptop

Recording Software, was on previous laptop

This device - http://amzn.com/B00B872ASY - No drivers installed, windows detected it on its own

What solves it temporarly:

Just a standard reboot

At this time I have unplugged the external USB audio recording device and rebooted, going to let it sit. It's hard to troubleshoot since it can take up to 24 hours for it to start to display the issue after a reboot.

If I think of any further details, I will post them. I am totally at a loss here. I did the fresh OS load Friday and came in to it today in it's broken state.Reboot fixed it. The above item (2) and (3) are the only symptoms in Event Viewer related to logs.

12,517 · May 19, 2015

Bump, removing the external USB audio device changed nothing.

5,544 · May 19, 2015

Have you tired uninstalling Meraki (Cisco?

1,116 · May 19, 2015

Do the two device happen to have the same MAC address?

31,906 · May 19, 2015

"but I am unable to ping or resolve anything via DNS"

So you can not ping your dns, or your saying stuff does not resolve via ping or nslookup?

So what do you get for response with nslookup, and can you even ping your dns? What are you using for dns - please post ipconfig /all from the box when its working, and then when its not working.

If you can ping your dns server by IP. But it does not answer dns queries via nslookup. Please verify that the mac address is correct for the dns server.

so ping ip of dns server, then use arp -a does that mac match what the dns server is? If you can not even ping the dns. What do you show in arp ?

12,517 · May 19, 2015

Have you tired uninstalling Meraki (Cisco?

I have not, I guess that's worth a shot, but it is installed on the 80 other workstations on the domain.

Do the two device happen to have the same MAC address?

Have not checked that yet, but wouldn't that affect two systems? I will check and verify to be safe and post back.

"but I am unable to ping or resolve anything via DNS"

So you can not ping your dns, or your saying stuff does not resolve via ping or nslookup?

So what do you get for response with nslookup, and can you even ping your dns? What are you using for dns - please post ipconfig /all from the box when its working, and then when its not working.

If you can ping your dns server by IP. But it does not answer dns queries via nslookup. Please verify that the mac address is correct for the dns server.

so ping ip of dns server, then use arp -a does that mac match what the dns server is? If you can not even ping the dns. What do you show in arp ?

No I can ping the DNS servers, but I cannot resolve anything on system unless it was previously cached.

DNS is two internal MS AD DNS servers, 172.16.50.6 and 172.16.50.5.

I will have to check the ARP table using arp -a once it starts doing it again, probably first thing in the morning.

5,544 · May 19, 2015

I have not, I guess that's worth a shot, but it is installed on the 80 other workstations on the domain.

I've seen Meriki cause weird issues like this..

12,517 · May 19, 2015

Now this is interesting, from one of the main AD DC/DNS servers, I do see 2 entries for the same MAC using arp -a

169.254.206.255 34-e6-d7-1b-c1-9a dynamic

172.16.50.149 34-e6-d7-1b-c1-9a dynamic

What could be pushing a 169.254 address to the DC/DNS?, Could that even be the problem?

5,544 · May 19, 2015

Now this is interesting, from one of the main AD DC/DNS servers, I do see 2 entries for the same MAC using arp -a

169.254.206.255 34-e6-d7-1b-c1-9a dynamic

172.16.50.149 34-e6-d7-1b-c1-9a dynamic

What could be pushing a 169.254 address to the DC/DNS?, Could that even be the problem?

This is crazy.. But have you checked the DHCP server and see if there is any reservations setup?

12,517 · May 19, 2015

This is crazy.. But have you checked the DHCP server and see if there is any reservations setup?

No reservations on the scope, and the client is using a static IP

12,517 · May 19, 2015

There are a few others in arp -a from the main DC that come back like that, but only 2 can I identify as workstations that match anything else.

169.254.45.7 98-90-96-b4-00-85 dynamic

169.254.100.231 98-90-96-b8-24-ac dynamic

169.254.116.227 30-59-b7-88-ae-58 dynamic

169.254.134.243 18-03-73-46-cd-59 dynamic - Another workstation which has a DHCP address on 172.16.50.X scope

169.254.182.247 90-b1-1c-61-21-a2 dynamic

169.254.206.255 34-e6-d7-1b-c1-9a dynamic - Client in question

169.254.221.16 78-52-1a-37-e8-66 dynamic

I've seen Meriki cause weird issues like this..

Just uninstalled the Meraki client, worth a shot.

12,517 · May 19, 2015

One thing of note, the system's static IP is the same as the previous systems IP that it replaced.

However all DNS entries in both DC/DNSs show the correct DNS name for the client.

I am going to change the IP to a previously unused address of 172.16.50.144, which has been unoccupied for years and do a ipconfig /registerdns and then verify everything updates.

12,517 · May 19, 2015

BudMan any benefit or problem with clearing the ARP cache on the main Domain Controller, none of those 169.x.x.x addresses show in the other Domain Controller.

11,094 · May 19, 2015

no clearing the arp cache will not cause issues, it will just rebuild it.

I can take a look and see if I see anything if you want. Can look at tomorrow sometime. shoot me over teamviewer creds and I would be happy to poke around (it will be a nice break from doing paper work).

12,517 · May 19, 2015

no clearing the arp cache will not cause issues, it will just rebuild it.

I can take a look and see if I see anything if you want. Can look at tomorrow sometime. shoot me over teamviewer creds and I would be happy to poke around (it will be a nice break from doing paper work).

Well I cleared the ARP on that server and so far all of the entries are normal.

I'd let you take a look but I am limited by CJIS/FBI restrictions and I've have to do a vendor processing of you with a background check and Livescan finger printing just to allow you in. So we'll have to see what happens via the forum and if any of these changes make a difference in the morning,

12,517 · May 20, 2015

As of this morning after clearing the ARP cache on that one DC, the client is not generating any netlogon/group policy events and all seems normal. I am going to let it sit another day until i deem it solved.

31,906 · May 20, 2015

but arp cache is very short anyway.. Clearly it might of fixed the problem for a short period, but if you have an issue with the APIPA addresses - that is what 169.254 address are, I would think that would just come back.

Devices will give themselves APIPA addresses when set for dhcp and don't get a lease.

I would of been curious to see the output of ipconfig /all when you had the problem on the workstation.

12,517 · May 20, 2015

but arp cache is very short anyway.. Clearly it might of fixed the problem for a short period, but if you have an issue with the APIPA addresses - that is what 169.254 address are, I would think that would just come back.

Devices will give themselves APIPA addresses when set for dhcp and don't get a lease.

I would of been curious to see the output of ipconfig /all when you had the problem on the workstation.

If it crops back up again I will get a ipconfig /all when it is happening, along with a arp -a from both the workstation and both DC/DNS servers.

12,517 · May 21, 2015

Well it has begun again this morning.

Last Changes:

Meraki was uninstalled

ARP cache was cleared on both DC/DNS servers

If I try to remote into the system right now from my desktop, I get: "Remote Desktop cannot verify the identity of the remote computer because there is a time or date difference between your computer and the remote computer. Make sure your computer's clock is set to the.... blah blah"

Even though the time/date and timezones are identical, they sync to the DCs

I can ping the DNS name of the laptop from my workstation, it resolves and replies.

The mapped drives on the laptop still work, I can access them.

I cannot access any other DNS names in Windows Explorer \\computername it fails with a name error. I also cannot access any DNS names via Chrome or IE.

I can do NSLOOKUP and successfully resolve computer names and it defaults to the primary DC/DNS server for lookups.

IPCONFIG from Laptop with Issue:


Windows IP Configuration

   Host Name . . . . . . . . . . . . : CLERKS-RECORD
   Primary Dns Suffix  . . . . . . . : <removed for privacy but correct FQDN>
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : <removed for privacy but correct FQDN>

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
   Physical Address. . . . . . . . . : 9C-D2-1E-D5-38-26
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection 3:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter #2
   Physical Address. . . . . . . . . : 3E-D2-1E-D5-38-25
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
   Physical Address. . . . . . . . . : 2E-D2-1E-D5-38-25
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Dell Wireless 1707 802.11b/g/n (2.4GHZ)
   Physical Address. . . . . . . . . : 9C-D2-1E-D5-38-25
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (3) I218-LM
   Physical Address. . . . . . . . . : 34-E6-D7-1B-C1-9A
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::412a:a978:a366:6d95%11(Preferred) 
   IPv4 Address. . . . . . . . . . . : 172.16.50.144(Preferred) 
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : fe80::c2ea:e4ff:fe57:5304%11
                                       172.16.50.254
   DNS Servers . . . . . . . . . . . : 172.16.50.6
                                       172.16.50.5
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{C814AE50-E2E6-4CDC-AB63-20E816D4EA1D}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{F0FE616E-A22A-4770-AD8D-C5B1F8D6795F}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{0AEA2487-FB41-4C00-9B78-59B736A64853}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{0C9FD2E2-968B-43C8-A18F-04C64D678648}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{4F325E36-023D-4C56-9309-C7CF2E7AAC45}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

ARP -A from Laptop with issue


Interface: 172.16.50.144 --- 0xb
  Internet Address      Physical Address      Type
  172.16.50.5           78-2b-cb-0d-82-91     dynamic   
  172.16.50.6           78-2b-cb-0d-82-79     dynamic   
  172.16.50.16          b0-83-fe-c6-13-8c     dynamic   
  172.16.50.24          98-90-96-b5-52-0d     dynamic   
  172.16.50.26          4c-bb-58-6e-2e-d0     dynamic   
  172.16.50.29          98-90-96-b3-fa-b6     dynamic   
  172.16.50.37          80-be-05-9c-76-7a     dynamic   
  172.16.50.52          98-90-96-b4-02-03     dynamic   
  172.16.50.53          18-03-73-49-27-01     dynamic   
  172.16.50.210         18-03-73-49-24-2f     dynamic   
  172.16.50.254         c0-ea-e4-57-53-04     dynamic   
  172.16.50.255         ff-ff-ff-ff-ff-ff     static    
  224.0.0.22            01-00-5e-00-00-16     static    
  224.0.0.252           01-00-5e-00-00-fc     static

ARP -a from main DC/DNS 172.16.50.6


Interface: 172.16.50.6 --- 0xf
  Internet Address      Physical Address      Type
  172.16.50.4           44-a8-42-05-b4-0e     dynamic   
  172.16.50.5           78-2b-cb-0d-82-91     dynamic   
  172.16.50.7           00-11-32-25-fb-37     dynamic   
  172.16.50.8           00-03-ea-0a-17-2b     dynamic   
  172.16.50.11          d4-ae-52-89-ad-0f     dynamic   
  172.16.50.16          b0-83-fe-c6-13-8c     dynamic   
  172.16.50.17          b0-83-fe-c5-3c-14     dynamic   
  172.16.50.21          18-03-73-46-da-46     dynamic   
  172.16.50.22          00-50-c2-de-c6-e9     dynamic   
  172.16.50.23          98-90-96-b3-9a-6a     dynamic   
  172.16.50.24          98-90-96-b5-52-0d     dynamic   
  172.16.50.25          98-90-96-b8-78-fa     dynamic   
  172.16.50.26          4c-bb-58-6e-2e-d0     dynamic   
  172.16.50.27          00-05-b9-04-20-58     dynamic   
  172.16.50.28          f8-b1-56-dd-f7-33     dynamic   
  172.16.50.29          98-90-96-b3-fa-b6     dynamic   
  172.16.50.30          18-03-73-49-26-5d     dynamic   
  172.16.50.31          18-03-73-49-2a-71     dynamic   
  172.16.50.32          98-90-96-a5-8e-88     dynamic   
  172.16.50.33          98-90-96-b3-6c-2a     dynamic   
  172.16.50.34          00-13-20-52-db-e1     dynamic   
  172.16.50.35          98-90-96-b3-bc-b0     dynamic   
  172.16.50.36          b8-ca-3a-a4-1c-1a     dynamic   
  172.16.50.37          80-be-05-9c-76-7a     dynamic   
  172.16.50.38          28-98-7b-d2-67-1d     dynamic   
  172.16.50.39          00-25-64-d1-82-f9     dynamic   
  172.16.50.40          00-25-64-d1-88-dd     dynamic   
  172.16.50.41          98-90-96-b5-e1-b1     dynamic   
  172.16.50.42          18-03-73-46-cd-6b     dynamic   
  172.16.50.43          b8-ca-3a-73-05-11     dynamic   
  172.16.50.44          30-8c-fb-46-3f-e7     dynamic   
  172.16.50.45          b8-ca-3a-73-04-b7     dynamic   
  172.16.50.46          98-90-96-b8-29-58     dynamic   
  172.16.50.47          84-2b-2b-b4-b0-86     dynamic   
  172.16.50.48          98-90-96-b8-95-3a     dynamic   
  172.16.50.49          cc-95-d7-73-35-da     dynamic   
  172.16.50.50          18-03-73-49-18-fd     dynamic   
  172.16.50.52          98-90-96-b4-02-03     dynamic   
  172.16.50.53          18-03-73-49-27-01     dynamic   
  172.16.50.54          80-1f-02-9e-29-52     dynamic   
  172.16.50.55          18-03-73-47-5a-39     dynamic   
  172.16.50.56          90-b1-1c-94-b9-16     dynamic   
  172.16.50.57          c0-ea-e4-57-53-04     dynamic   
  172.16.50.58          c0-ea-e4-57-53-04     dynamic   
  172.16.50.62          00-10-60-e1-02-f8     dynamic   
  172.16.50.64          00-23-ae-6b-b0-a4     dynamic   
  172.16.50.65          00-25-64-d1-66-60     dynamic   
  172.16.50.68          90-b1-1c-61-21-a2     dynamic   
  172.16.50.70          00-25-64-d1-88-70     dynamic   
  172.16.50.71          00-13-20-e9-f2-0e     dynamic   
  172.16.50.73          78-e4-00-07-a9-18     dynamic   
  172.16.50.76          00-25-64-d1-86-8a     dynamic   
  172.16.50.82          00-25-64-d1-86-9c     dynamic   
  172.16.50.93          18-03-73-c2-e3-36     dynamic   
  172.16.50.109         b8-ca-3a-72-fe-05     dynamic   
  172.16.50.110         18-03-73-49-27-3c     dynamic   
  172.16.50.111         00-25-64-d1-86-ad     dynamic   
  172.16.50.112         18-03-73-49-22-76     dynamic   
  172.16.50.113         90-b1-1c-f9-49-95     dynamic   
  172.16.50.114         00-25-64-d1-66-2a     dynamic   
  172.16.50.115         b8-ca-3a-73-ca-b3     dynamic   
  172.16.50.116         f8-b1-56-de-aa-5a     dynamic   
  172.16.50.119         98-90-96-b8-2c-dd     dynamic   
  172.16.50.139         00-23-63-26-75-a5     dynamic   
  172.16.50.140         00-23-63-24-35-bd     dynamic   
  172.16.50.143         00-14-22-fa-a0-a1     dynamic   
  172.16.50.144         34-e6-d7-1b-c1-9a     dynamic   
  172.16.50.145         00-25-64-d1-65-e0     dynamic   
  172.16.50.146         00-19-b9-30-09-af     dynamic   
  172.16.50.148         00-18-8b-29-3f-d1     dynamic   
  172.16.50.195         30-05-5c-5c-9b-e3     dynamic   
  172.16.50.196         00-20-6b-8d-89-44     dynamic   
  172.16.50.197         00-20-6b-8e-e6-4b     dynamic   
  172.16.50.198         00-20-6b-69-b2-24     dynamic   
  172.16.50.199         00-20-6b-8d-77-11     dynamic   
  172.16.50.200         30-05-5c-0d-b4-b4     dynamic   
  172.16.50.202         30-05-5c-07-58-ce     dynamic   
  172.16.50.203         b4-99-ba-dc-75-d1     dynamic   
  172.16.50.205         00-20-6b-62-da-28     dynamic   
  172.16.50.206         30-05-5c-2f-e5-88     dynamic   
  172.16.50.207         00-20-6b-8c-4c-74     dynamic   
  172.16.50.208         00-20-6b-80-23-b8     dynamic   
  172.16.50.209         30-0e-d5-bd-87-f2     dynamic   
  172.16.50.210         18-03-73-49-24-2f     dynamic   
  172.16.50.211         84-2b-2b-b4-ad-21     dynamic   
  172.16.50.212         98-90-96-b8-24-ac     dynamic   
  172.16.50.213         98-90-96-b5-e3-51     dynamic   
  172.16.50.214         90-b1-1c-9e-e3-7f     dynamic   
  172.16.50.215         f8-b1-56-de-84-b8     dynamic   
  172.16.50.216         f8-b1-56-de-3f-52     dynamic   
  172.16.50.218         18-03-73-49-2a-cb     dynamic   
  172.16.50.219         18-03-73-49-1e-dd     dynamic   
  172.16.50.220         84-2b-2b-b4-a8-fa     dynamic   
  172.16.50.221         98-90-96-b4-00-85     dynamic   
  172.16.50.222         f8-b1-56-de-b2-4f     dynamic   
  172.16.50.224         5c-f9-dd-77-01-37     dynamic   
  172.16.50.225         98-90-96-b7-ad-d4     dynamic   
  172.16.50.227         f8-b1-56-de-2e-48     dynamic   
  172.16.50.228         00-25-64-d7-1a-96     dynamic   
  172.16.50.229         00-50-fc-3c-04-1b     dynamic   
  172.16.50.230         f8-b1-56-de-45-32     dynamic   
  172.16.50.231         00-26-5e-44-fa-12     dynamic   
  172.16.50.232         00-18-ae-46-11-fd     dynamic   
  172.16.50.233         18-03-73-46-cd-59     dynamic   
  172.16.50.234         d0-ff-50-88-bc-fa     dynamic   
  172.16.50.235         d0-ff-50-89-dc-c3     dynamic   
  172.16.50.236         98-90-96-b5-e6-55     dynamic   
  172.16.50.251         c0-ea-e4-57-53-04     dynamic   
  172.16.50.254         c0-ea-e4-57-53-04     dynamic   
  172.16.50.255         ff-ff-ff-ff-ff-ff     static    
  224.0.0.22            01-00-5e-00-00-16     static    
  224.0.0.252           01-00-5e-00-00-fc     static    
  239.255.255.250       01-00-5e-7f-ff-fa     static    
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

3,531 · May 21, 2015

There was an issue like this at my work and it was to do with the DHCP scope

i had no part in it so excuse my ignorance

what it turned out to be was a device on the VLAN that had the same IP as the VLAn itself

If you set the laptop to DHCP does it work fine then? or change its ip to something else

12,517 · May 21, 2015

There was an issue like this at my work and it was to do with the DHCP scope

i had no part in it so excuse my ignorance

what it turned out to be was a device on the VLAN that had the same IP as the VLAn itself

If you set the laptop to DHCP does it work fine then? or change its ip to something else

The original IP was 172.16.50.149 and I've since changed it to 172.16.50.144, I have not tried DHCP yet, Simply because the system runs a streaming server used once in awhile and it has a firewall rule/NAT policy pointed to that IP to allow some streaming outbound of our Firewall. I suppose that is worth a shot though. I am switching it to DHCP now to test.

We do not have any VLANs setup.

31,906 · May 21, 2015

You say the times are correct, but what about the timezones?

A simple w32tm /montior

should show you what the time difference is to the DC, etc.

And for gawd sake clean up that nonsense with teredo and 6to4 isatap -- clearly your not using them.. Are you using ipv6 at.. disable it then.

12,517 · May 21, 2015

You say the times are correct, but what about the timezones?

A simple w32tm /montior

should show you what the time difference is to the DC, etc.

And for gawd sake clean up that nonsense with teredo and 6to4 -- clearly your not using them.. Are you using ipv6 at.. disable it then.

Yep just checked them to confirm time zones match.

Results of w32tm /monitor

SRV-DC01.<FQDN removed> *** PDC ***[172.16.50.6:123]:
    ICMP: 0ms delay
    NTP: +0.0000000s offset from SRV-DC01.<FQDN removed>
        RefID: 'LOCL' [0x4C434F4C]
        Stratum: 1
SRV-DC02.<FQDN removed>[172.16.50.5:123]:
    ICMP: 0ms delay
    NTP: -0.0161567s offset from SRV-DC01.<FQDN removed>
        RefID: SRV-DC01.<FQDN removed> [172.16.50.6]
        Stratum: 2

Warning:
Reverse name resolution is best effort. It may not be
correct since RefID field in time packets differs across
NTP implementations and may not be using IP addresses.

11,094 · May 21, 2015

have you tried a different port on the switch? have you tried resetting the switch or restarting the switch? do you have any event logs?have you tried a different switch? if it's only the one computer it could be anything that the computer is connected to or it could be the network card.

12,517 · May 21, 2015

BTW thank you all for taking the time to respond with suggestions, because this is driving me crazy.

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Weird Problem, Stumped, DNS starts to fail after idle

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