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:		         362 hits
Availability:		       51.06 %
Elapsed time:		       59.46 secs
Data transferred:	        3.73 MB
Response time:		        6.22 secs
Transaction rate:	        6.09 trans/sec
Throughput:		        0.06 MB/sec
Concurrency:		       37.84
Successful transactions:         362
Failed transactions:	         347
Longest transaction:	        7.85
Shortest transaction:	        0.10