Problem displaying dynamic map services with ArcGIS Google API

Question

The knowledge base article shows how to overlay a service from ArcGIS Server over the google maps base layer. The code in the article works perfectly until I replace the dynamic URL with my own map service. I cannot get any of our dynamic map services to overlay like the ESRI one does. Here's my code: ArcGIS JavaScript Extension for the Google Maps API Example

NianweiLiu · Answer

Question was answered in a different thread. Your map server's output directory is using host name, not a public domain name. The extension uses json output directory, that's why you are not seeing the image. The more recent JS API (and service directory) use direct image output thus hide the problem in the G extension.

CurtWalker · Answer

Do you have your own google key? Simply replace map service URL to yours won't work because the sample's key is registered with Esri's domain. If you do not have an existing key you may out of luck because Google may no longer issue keys for v2 API (deprecated for 2+ years now). My code above doesn't use the sample key for ESRI, it uses my key registered to my domain. You got me curious about version 2 though, so I generated a new key and switched to version 3 (See updated code below). This did not fix the problem. The problem really has nothing to do with the Google API. It's an issue with ArcGIS and the dynamic service, at least that is currently the theory of ESRI technical support. Still awaiting resolution... ArcGIS JavaScript Extension for the Google Maps API Example

NianweiLiu · Answer

Do you have your own google key? Simply replace map service URL to yours won't work because the sample's key is registered with Esri's domain. 
If you do not have an existing key you may out of luck because Google may no longer issue keys for v2 API (deprecated for 2+ years now). You should really avoid this approach and look for alternatives.