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Internal AD-DNS issues

By mohamed ·
My domain is named calgary.mydomain.com
There are websites
1. www.collinsbarrow.com
2. OWA (mymail.collinsbarrow.net)
3. www.mri-toronto.com

Internally no one is able to access theses sites. This issue was noticed early last week and I am still at a lost for the cause or resolution.

ON server 172.x.x.x in IIS I have an entry for
CBNational (if I right click and browse it will take me to the site)
www.mri-toronto.com (if I right click and browse it will NOT take me to the site)

ON server 172.x.y.z (mail server Exchange 2003) in IIS I have an entry for
mymail.collinsbarrow.net (if I right click and browse it will take me to the site)

Site 1. is accessible using the IP of one of our internal servers 172.x.x.x
Site 2. is accessible using the IP of one of our internal servers 172.x.y.z
Site 3. cant even access not sure which IP will make it accessible (not as important as site 1 and 2)

In my DNS I manually entered New Host(A) record using National as the name and 172.x.x.x for the IP. Now I am able to access the site using http://national.
I need to be able to access the site using its full naming (www.collinsbarrow.com). I think if I figure the one site out it will maybe help me out with the others.

There is already an entry in DNS in the Calgary.collinsbarrow.com zone
Name WWW
Type CNAME
Data mailserver.calgary.collinsbarrow.com

we have an internal website that we host internally for our firm they type http://www to access our internal site that is up and running.

I did try to change it to the IP address of the other server for the www.collinsbarrow.com website just to see if that would work but that still did not work I would type http://www it would take me to that site but again if I enter http://www.collinsbarrow.com it does not work.
For host headers on the www.collinsbarrow.com website there is only an IP address specified (of the server)
For host headers on the www.mri-toronto.com website there is a IP address specified (of the server) and host header www.mri-toronto.com

In IIS www.collinsbarrow.com website it is setup with the IP of the server.calgary.collinsbarrow.com if I put the IP address of server.calgary.collinsbarrow.com in the browser (internal) it will take me to what you would see from outside as www.collinsbarrow.com

This is not the only site I am having issues with the same problems resides with
http://mymail.collinsbarrow.net which is on mailserver.calgary.collinsbarrow.com
in IIS on the mailserver it is setup with the IP of the mailserver.calgary.collinsbarrow.com if I put the IP address of mailserver.calgary.collinsbarrow.com in the browser it will take me to what you would see from outside as mymail.collinsbarrow.net

I hope im being clear enough my appologies.

I tried to stop our internal http://www website
I then took the WWW CNAME DNS entry and pointed it to the other server server.calgary.collinsbarrow.com
I then tested http://www and it took me to the www.collinsbarrow.com site
in IIS on server.calgary..... I then put in a host header on that site as www.collinsbarrow.com
stopped and started the site and did an iisreset.
Still no luck ?.
Here are nslookups that may help ??
C>nslookup www.collinsbarrow.com
Server: DC.calgary.collinsbarrow.com
Address: 172.x.x.x

Non-authoritative answer:
Name: www.collinsbarrow.com.collinsbarrow.com
Address: 216.x.x.x

C>nslookup national
Server: DC.calgary.collinsbarrow.com
Address: 172.x.x.x

Name: national.calgary.collinsbarrow.com
Address: 172.x.y.z

Please any help would be great Ive been at this for over a week. Thanks.

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