siege -b -c40 -t60S http://c5sandbox.exchangecore.com/
** SIEGE 3.0.5
** Preparing 40 concurrent users for battle.
The server is now under siege...
Lifting the server siege...      done.

Transactions:		         682 hits
Availability:		       75.36 %
Elapsed time:		       59.22 secs
Data transferred:	        4.03 MB
Response time:		        3.37 secs
Transaction rate:	       11.52 trans/sec
Throughput:		        0.07 MB/sec
Concurrency:		       38.84
Successful transactions:         682
Failed transactions:	         223
Longest transaction:	        4.93
Shortest transaction:	        0.10