Server 2012 Domain slow internet browsing

We have a client who has a Server 2012 domain running 3 server on Hyper-V. One server is running as DC, DNS, DHCP. Other is Exchange 2013 server. The 3rd is a voip system. The issue is with internet browsing which unacceptably slow on domain workstations.
Tested a computer directly connected through internet no issues.

There current internet is Fibre 100Mbps/50Mbps.
The firewall is Sonicwall TZ105W.

When a machine not part of the domain is connected to the network browsing works fine while using the internal DNS. But once you join this machine to the domain problem starts.

I have hit a brick wall. Any suggestions would be great. I have tried to setup DNS forwarders to the ISP didn't make any difference.
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Cliff GaliherCommented:
Well, since your DNS server is a VM, and non-domain workstations can use it without slowing down, we can take Hyper-V off the table. I'd look at changes only.domain workstations experience. Group policies, deployed software, login/startup scripts. Things that'd be changing networking on the workstation that DHCP alone wouldn't be changing.
Sumit Singh ShekhawatTechnical Solutions ConsultantCommented:
Post the result of Recursive query on your DNS server
Michael OrtegaSales & Systems EngineerCommented:
Can you set your client PC with a static DNS entry - Then test browsing. That eliminates the local server completely.

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Michael OrtegaSales & Systems EngineerCommented:
Also setup a constant ping to your AD/DNS server. Do you notice any unusual latency or packet loss? There are some known issues with certain NICs and Hyper-V VMs, e.g. Broadcom. Make sure you have the latest NIC drivers on your Hyper-V host.

alinknetAuthor Commented:
How do you run a Recursive query on DNS server ?
Michael OrtegaSales & Systems EngineerCommented:
From the DNS manager properties. I wouldn't worry about that yet. I would first determine whether or not your server has anything to do with it. Use public DNS statically on your client machine and see if there is any difference.

alinknetAuthor Commented:
Using public DNS on clients makes no difference still the same.
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Maybe a bad web proxy set up as GPO?
Michael OrtegaSales & Systems EngineerCommented:
Then the problem is not likely DNS on the server. Like Qlemo mentioned, are you using some kind of web filtering service? If not, what does the latency look like when you simply ping a public host? Curious whether or not there is packet loss or latency related to your internet connection.

Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Performing Profiling in the web browser (F12, then Profiler or similar, depending on the browser used). That tells which part is slow, and might reveal e.g. Java scripts as being an issue.
alinknetAuthor Commented:
Hi Guys,

 We mange to solve the issue. It was an unusual one. We had multiple WAN connections configured on the Sonicwall which was creating  some kind of loop on request. Once we removed all connections and reconfigured the device all started to work normally. Thanks for all your suggestions.

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alinknetAuthor Commented:
The issue was with the Firewall device and not the server or the rest of the network.
Michael OrtegaSales & Systems EngineerCommented:
My suggestions indicated that the problem was not server or DNS related. In fact, my last suggestion was to test the Internet/WAN connectivity through simple ping tests, etc. I guess that information didn't help you at all and that you just thought to look at the firewall/gateway device all by yourself with no influence from the experts, hence you awarded 0 points.

"alinknet", I'll make sure not to put time into answering your future questions. Thanks.

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