Comment 7 for bug 1576820

Soumik,

The request wasn't accepted because the stack validation failed, hence the 400 response. In some cases, stack validation will succeed and you'll get a 202 response, but then an error is encountered during the creation. Heat will fail the stack creation and you'll see the error message in the stack status reason.

In this case, I don't think Heat can get a more specific error message from Nova if it can't connect to the Nova endpoint. The behavior seems correct.

Jason