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DNS Issue

Hi All

having a funny issue with DNS we have a main site where we have a dns server setup using Root Hints, And we have remote workers all with Draytek routers. There routers are all connected over a VPN everything has been fine until recently, som of the users when trying to browse to certain sites like google they get the following error.

DNS Service Withdrawn. This DNS resolution service is no longer available for public use

the DNS servers set in each of the routers are as follows.

1 is the dns server at the main site coonnected over the vpn

2 is googles own dns of 8.8.8.8

any idears on why this might be happening.

john
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pepps11976
Asked:
pepps11976
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1 Solution
 
TBK-ConsultingCommented:
Is there any particular reason you want to have your users browsing and resolving DNS thru the VPN?  Would it not be less traffic and burden on your servers to have browsing go directly to the internet from the remote machines and only thru the VPN to access internal resources?  Doing this may also correct the DNS issue you have, with the benefit of reducing load on your servers as well.
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pepps11976Author Commented:
The reason that they browse through the vpn is because we have a web proxy server there (Websense) this has been working fine for months any idear what would suddenly cause this???
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TBK-ConsultingCommented:
Is it possible that your ISP is blocking DNS traffic other than their own?
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pepps11976Author Commented:
But surely if that was the case then they would not be able to browse any websites
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TBK-ConsultingCommented:
unless the websites they are getting to are cached in your DNS, and only ones that are not cached are the ones failing ...
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pepps11976Author Commented:
Ok Checked with ISP Provider, these are all Business lines and the DNS is allowed to be changed,
Any more idears?
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gavvingCommented:
What OS is the DNS Server?  Is it Windows Server 2008 R2?
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pepps11976Author Commented:
The DNS Server is windows Server 2003
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gavvingCommented:
Are you using any type of Proxy?  Are you sure that the workstations aren't auto-detecting a proxy and using it?  You can disable auto-detect of proxys in the IE Browser options.  
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pepps11976Author Commented:
They are using a proxy server which is websense but we have had this for years and it does not do it for all users, so why suddenly only for some, If indeed this is the issue
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