Ok, I think I found a bug here…
In the “forms-3rdparty-integration.php” file, I can see in the “on_response_failure” function that it is supposed to call the hook “remote_failure”. In my case, since I am using Contact Form 7, this calls the “remote_failure” method in the “contactform7.php” file. Or, at least it should.
For some reason I do not yet understand, it logs an error when attempting the “apply-filters” call in “on_response_failure”, indicating that the function is expecting the first parameter to be passed by reference, but that it was being passed by value. I was only able to get it to run by altering the “remote_failure” function to take it’s parameters by value (i.e. remove the & before each parameter).
Note: this also needed to be done to the “remote_success” method to get it to work.
FWIW, I am using WP 3.7.1 and PHP 5.4.4
Hope this helps someone else…
