Custom Domain Name – Server not found Google App Engine and Google Apps

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I have integrated my domain at Google Apps with Google App Engine. I added www.myDomain.com to google app,it was working correctly and pointing to my application at appEngine, but now it doesn't direct to appengine, although myApp.appspot.com is working properly. Do you have any idea what cause this problem?

Edit:Extra Info

Initially sites were active, I deleted www from there and add it to appEngine it worked. I deployed different versions in app engine, and returned to previous version (by the way I didn't touch to Apps), suddenly www.myDomain.com and others like test.myDomain.com started to do not work.
http://docs.myDomain.com also does not work

Same Topic:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/7541a94c0d5895b7

Errors I got:

Firefox: The connection was reset

Chrome: This webpage is not available.

IE: Internet Explorer cannot display the webpage.

Best Answer

Are you possibly living in Turkey? Using Turkish ISPs? Because ghs.l.google.com is blocked currently in Turkey.

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Domain – Google app engine with custom domain shows redirected URLs

You’re right, the App Engine Flexible Environment is currently in Beta as stated on the official page and its implementation may change, possibly in backward-incompatible ways.

Now, in order to use Custom Domains with a Flexible Environment GAE instance, you first need to whitelist them prior adding them for your application as mentioned in this Before you Begin section. Listed in the third point, it is possible to whitelist the domains by filling out this Google contact form.

Note that prior using any custom domains, all GAE instance's traffic is served from the appspot-preview.com domain as described in the Domain Update section. Therefore, it is possible that you were initialy able to map yourdomain.com to YourProjectID.appspot-preview.com and so, presumably having your ProjectID the same as yourdomain name would explain the behavior you noticed.

GCP – How to Enable IAP for K8s on GCP

To begin with, here’s some general information:

To get started with IAP in GCP, add an App Engine app or configure Cloud Load Balancer for IAP. In case you are running Kubernetes cluster, you may have the Load Balancer configured already.

Then you should enable IAP for it here: Menu -> Security -> Identity-Aware Proxy

And finally, that is the place where redirect URI can be configured. You can get there from previous step by selecting triple dot on the right side of your App/LB and choosing Edit OAuth Client.

Menu -> APIs & Services -> Credentials

Create OAuth clientID and set Authorized redirect URIs for it.

Authorized redirect URIs
For use with requests from a web server. This is the path in your application that users are redirected to after they have authenticated with Google. The path will be appended with the authorization code for access. Must have a protocol. Cannot contain URL fragments or relative paths. Cannot be a public IP address.

For App Engine apps this value is predefined, but you can adjust it according to your needs.

Best Answer

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Domain – Google app engine with custom domain shows redirected URLs

GCP – How to Enable IAP for K8s on GCP

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