DNS problems maybe???

My domain controller today is not working right. it is booted and all the services appear to be running but noone can connect to it on the network. the server fails NSLookup to itself and cant ping out. it says ping failed. general failure. i can ping out to google. i just found out that the workstations also cannot ping themselves

the server is Server 2011 SBS and all the workstations are windows 7
tjwo94Asked:
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atlas_shudderedSr. Network EngineerCommented:
general failure is normally an indicator of a NIC problem.  Failure, shutdown or disconnect.
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Tom CieslikIT EngineerCommented:
For test only disable firewall and check again.
Make sure DNS service is working on server
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atlas_shudderedSr. Network EngineerCommented:
run an ipconfig /all and confirm you have IP address(es)/gateways where expected.
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tjwo94Author Commented:
so at the moment im on a workstation. it is static and has the right settings. i have set it to auto and tried to ping with auto settings and then static again. still cant ping itself or others on the network. i put in a new switch and that also didnt help. firewall is off. dns is running on the server. i think i might need to check a few things in dns though. is there anything i can do in dns to check its health
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atlas_shudderedSr. Network EngineerCommented:
Is it the workstation on the server that is you saw the ping errors on?
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atlas_shudderedSr. Network EngineerCommented:
*or
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tjwo94Author Commented:
all the workstations and servers cant ping themselves or eachother as far as i know. i have been to a few machines all with the same error
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MaheshArchitectCommented:
check if any antivirus software is installed on workstations and server and if you have disabled ping through central console rule
ex: mcafee or symantec
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tjwo94Author Commented:
i changed the ip in a workstation to an ip not in our network and the ping works fine. its like theres a really bad loopback or something breaking all network traffic
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atlas_shudderedSr. Network EngineerCommented:
can you run the ipconfig of a machine that doesn't work and the one that is and show the results?
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Tom CieslikIT EngineerCommented:
Make sure you don't have any other routing device (router, VPN) connected with same subnet in your network.
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tjwo94Author Commented:
so i was running a continuous ping and was killing processes. we have malwarebytes running which has never been an issue. well apparently it is an issue now. we ran a diagnostic on a nic on one of the workstation and in the fine print it said malwarebytes could be blocking communication. im removing malwarebytes from the DC soon. we will find out more then
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Andy BartkiewiczNetwork AnalystCommented:
When you say they can't ping each other, are you pinging by dns name or by IP?
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Tom CieslikIT EngineerCommented:
I've never heard that mylwarebytes is blocking network traffic.
It must be something different, because like you've said if you'll change IP then Ping is working.
For me it looks like route issue, are you sure no other router or VPN connection with same settings you're using is not working somewhere in your network ?
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masnrockCommented:
Which edition of Malwarebytes did you have installed on the server? There was one that I have seen that corrupt communications quite a few times, but there was never a pattern, other than it always being on servers.

If that doesn't work...
When you ran nslookup, what type of result were you getting? I've seen times where the results were IPv6 centric, being the root cause of the problem. I've had to unbind IPv6 from the NIC of the server in some instances to get things operating normally again (notice I did *not* say to uninstall or actually disable IPv6).
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tjwo94Author Commented:
Alright fellas, its fixed for the moment. heres the scoop if you didnt already hear about it. Malwarebytes released a bad update which caused this problem and slowness/freezes. the Lan connection was blocked totally by Malwarebytes. i couldnt ping out to anything, including the local machines, by IP or by computer name. There was a patch that we had to install on each machine, which took an absurd amount of time, as you can imagine. you can plug in a flash drive and run the little patch that malwarebytes provided, and reboot, and it was fixed...however most of our computers at this facility had usb access disabled for security purposes. we had to boot into safemode and since malwarebytes wasnt running, we did have access to the network where we could copy and paste the patch to the desktop. unfortunately the patch would not work in safe mode. it appeared to work, but on reboot it was still jacked up. we had to copy in safe mode and then boot into normal mode to run the patch, and then reboot a third time....after all that most were fine. there were about 8 pcs out of like 50 that needed to be rebooted and have the patch run 3 times or so before they were fixed....we have 3 other networks with malwarebytes running and who were not affected at all.

My DC is fine, all the workstations are fine. the Network switch i thought was the problem to begin with is FINE....a whole day wasted. hope this helps someone. Malwarebytes released an email saying sorry with fixes after i was pretty much done with fixing it myself....
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masnrockCommented:
Author solved on their own.
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