DNS - Internal Zones - Forwarding Issue with Pantheon

Greetings. We have two internal DNS Forward Lookup Zones (Windows Server 2008 R2):

blahblah-A.org
blahblah-B.org

We rarely use the second domain (blahblah-B.org), but we have a an Alias (CNAME) record in it to redirect internal connections to our website from our rarely used domain to our main domain name.  I.E.

www ---- > Alias (CNAME) ---- >  www.blahblah-A.org

Alias is:  www
FQDN is:  www.blahblah-B.org
FQDN target is:  www.blahblah-A.org

Our DNS is Google DNS.  Our DNS record for the rarely used domain, blahblah-B.org, is set up to forward to our main website - www.blahblah-A.org

Our website is hosted on Pantheon.

From OUTSIDE the organization, I can enter:   www.blahblah-B.org   in any browser and it redirects correctly to:   www.blahblah-A.org
FROM INSIDE our organization, when we enter www.blahblah-B.org into any browser, we get a 404 - Unknown Site error from Pantheon

Does this sound like a Pantheon configuration issue ?  A DNS forwarding issue ? Some sort of DNS security or relay issue ?  I'm lost.

Thanks much.
-Stephen
lapavoniAsked:
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footechCommented:
Can you go to www.blahblah-A.org inside your network and have the website load correctly?
lapavoniAuthor Commented:
Yes, our primary website - www.blahblah-A.org - is accessible from inside the network.
schapsCommented:
A FQDN is not complete without a trailing "dot"--
i.e. in the blahblah-B.org zone:

                     www.blahblah-B.org.   IN      CNAME  www.blahblah-A.org.

This would be on your internal DNS, obviously.
On the internal network, you may also consider using an A record in the zone file with a direct LAN iP address, i.e.:
                      www.blahblah-B.org.   IN      A  192.168.100.100
                      (still note the dot  ^^^)

If that is not the problem, consider posting the zone file in question changing the domain appropriately to maintain your security, and it will be a lot easier for someone to diagnose the problem.

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lapavoniAuthor Commented:
The dot is there.  It's actually a WAN IP.  The website is externally hosted.  I've tried that and Pantheon (Rackspace) doesn't resolve it properly.  When you say the zone file, do you mean all the entries in that zone ?
lapavoniAuthor Commented:
OK, the A record did the trick.  Thank you.  blahblah-B.org is registered with Google, then redirected, so I entered an A record for its Google address.
lapavoniAuthor Commented:
Thank you much.
schapsCommented:
Hey, great to hear, I had a couple paragraphs of further things to try ready to go when the notification came in that you'd closed the question. Cheers!
lapavoniAuthor Commented:
Appreciate your help.  Less complicated than I expected.  I probably had a bad A record in there, removed it, and replaced it with a CNAME (which did nothing).  Got the correct IP and all is well. Thanks again.
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