APIs: TestConnection failed when testing API (2012)

ERROR/WARNING MESSAGES:

Message : Operation failed(system error).
Source : Changepoint.ChangepointAPI2.ApiConnection.Initial
HaveErrors : true
Value : TestConnection failed.
 

RESOLUTION:

Web Services API was installed under a website where the application pool run with a built-in account (for instance NetworkService or Application PoolIdentity). To find the account name, in IIS, go to Application Pool, and check the Identity field.

After that, give this application pool identity full access on the API folder.

See also :
http://www.iis.net/learn/manage/conf...ool-identities

Alternatively, give full rights to Everyone on the API folder.