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:		        1037 hits
Availability:		       87.51 %
Elapsed time:		       59.49 secs
Data transferred:	        4.81 MB
Response time:		        2.24 secs
Transaction rate:	       17.43 trans/sec
Throughput:		        0.08 MB/sec
Concurrency:		       39.01
Successful transactions:        1037
Failed transactions:	         148
Longest transaction:	        3.40
Shortest transaction:	        0.10