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:		         499 hits
Availability:		       71.59 %
Elapsed time:		       59.75 secs
Data transferred:	        3.19 MB
Response time:		        4.62 secs
Transaction rate:	        8.35 trans/sec
Throughput:		        0.05 MB/sec
Concurrency:		       38.56
Successful transactions:         499
Failed transactions:	         198
Longest transaction:	       13.58
Shortest transaction:	        0.10