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DNS unable to resolve

Posted on 2011-03-09
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Last Modified: 2012-05-11
Hi everyone,

I’m trying to setup a server Win2008 with IIS on for webapplication, called “Host1”. I have 2 VLANS, one for the server farm (20.x.x), and one for clients(192.x,x), they’re both connected to the internet. And both Vlans use the same DNS server.

For an unjustifiable reason, I can only place this server on the clients VLan.

My problem is:

I can access the web application (http://host1) from 20.x.x.x just fine.

However when I try to access the same application from the clients Vlan, I get an error on Internet Explorer “Network Error (dns_unresolved_hostname) Your requested host "Host1" could not be resolved by DNS.” I tried using http://host1, http://host1.mydomain.com, and also tried http://host1:8080... I couldn’t try using http://192.x.x.x because my ISP doesn’t allow me to browse using IP address.
I checked my DNS, I do have an A host record of the server. I even tried to manually add it to the hosts file on my XP machine. I can ping and NSlookup just fine from all machines.

My conclusion is as follows:
When Client workstation tries to connect to the web application, it goes straight to the Internet’s DNS to check the host name, that is why I am getting a DNS unable to resolve error.

Please correct me if I’m wrong, I’m very frustrated. I need your Help!
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Question by:ahmedals
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Expert Comment

by:Chev_PCN
ID: 35093478
Your browser should be using the DNS settings specific to the local machine. On a workstation or server showing this problem, what result do you get back if you open a cmd box & run "nslookup host1"?
You say you have 1 DNS server. Do you have multiple zones on that DNS instance?
If so, try adding Host1 to both zones, e.g. host1.server.farm and host1.clients.net.
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Expert Comment

by:bitla
ID: 35093480
On the client PCs in the TCP/IP properties add DNS ip address of the host1 domain and also make sure there is forward and reverse lookup zones for the Host1 in the DNS Server.
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Accepted Solution

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ahmedals earned 0 total points
ID: 35093759
Hi Guys,

Thank you for your comments. I have already done that previouslym but still didn't work.

I found a solution to my problem.

I had forgotten to put an exception on my BlueCoat proxy device, thats why it was denying it access.
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Author Closing Comment

by:ahmedals
ID: 35135771
I had forgotten to put an exception in my proxy server.
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