Accroding to  http://developer.authorize.net/tools/errorgenerationguide/, 

we can set  zip=46205 or  ccv=901 to create failed requests. 

It worked fine for me before, but these days it doesn't work anymore. 

The requests all went through successfully. 

Testing Master Card number 54240000000060015 supposes to work too. But it now fails.

It is my problem or something wrong in the sandbox sever side ? 

Aug. 19, 2014