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Same domain name internal and external. Even with A Record, server and clients see IIS page

Posted on 2014-12-21
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Last Modified: 2015-02-10
Server 2012
A record for WWW created pointing to external web server
Server and clients see IIS start page when browsing www.ourfirm.com
NSLOOKUP returns proper external IP
brain hurts...

I have done this several times with other clients. The only difference here is Server 2012. What am missing here?

Thank you!
Tom
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Question by:Tom_Bombaci
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Expert Comment

by:Qlemo
ID: 40511609
What does ping tell? The resolving mechanism is slightly different from nslookup, so it might get different results. ipconfig /displaydns should also be checked.
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Author Comment

by:Tom_Bombaci
ID: 40511612
pinging www.ourfirm.com results in the correct IP responding

ipconfig /displaydns returns the proper IP for www.ourfirm.com


Thank you,
Tom
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Expert Comment

by:Gauthier
ID: 40511773
IPV6 issues?
or a proxy?
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Author Comment

by:Tom_Bombaci
ID: 40511790
I am thinking IPv6 too. Ipconfig /didplaydns returns nothing under an AAAA record for www.ourfirm.com
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Expert Comment

by:Gauthier
ID: 40511819
Try from an old windows XP client to be sure.
But if there is nothing in displaydns, then IPV6 is very unlikely, unless ping www would replay with AAAA.

That leave the proxy option, but you would know if there was one no?
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Expert Comment

by:Gauthier
ID: 40511824
Is the internet gateway the 2012 server?
Normally that shouldn't be the case.
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Author Comment

by:Tom_Bombaci
ID: 40511827
No proxy. The gateway is the firewall.

Tom
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Expert Comment

by:Gauthier
ID: 40511854
and ping www (without the .ourfirm.com) ?
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Expert Comment

by:Gauthier
ID: 40511863
If that's not it, my last hypothesis is that your external website is really also currently displaying the IIS welcome page :)
or you forgot to clear the browser cache...
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Author Comment

by:Tom_Bombaci
ID: 40511885
Pinging "www" returns the external IP. :) Tried two browsers, clearing cache(s), three machines. I am at a serious loss here. I am contemplating renaming the domain....
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Accepted Solution

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Tom_Bombaci earned 0 total points
ID: 40511901
Well, it seems when I browse to the clients website from home, it resolves to ourfirm.com (dropping the www). Having said that, I would presume the A Record "WWW" is doing its job since "ourfirm.com" is indeed itself in DNS on the local server.

Renaming the domain seems like the best answer and the path of least resistance.
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Expert Comment

by:Gauthier
ID: 40511922
The naked domain problem with AD, bad luck :(

Either disable the redirect on the external hosting.
It can be done with no problem regarding indexing so long as users do not mess up their communications and you add an canonical header tag to your html.
Or preferably (it avoid endless DNS problems) as you said, rename the domain to something like corp.ourfirm.com or another domain like ourfirm.local
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Author Closing Comment

by:Tom_Bombaci
ID: 40600308
Tried my own suggestion
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