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:		         339 hits
Availability:		       50.67 %
Elapsed time:		       59.51 secs
Data transferred:	        3.53 MB
Response time:		        6.65 secs
Transaction rate:	        5.70 trans/sec
Throughput:		        0.06 MB/sec
Concurrency:		       37.87
Successful transactions:         339
Failed transactions:	         330
Longest transaction:	        8.79
Shortest transaction:	        0.10