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:		         511 hits
Availability:		       62.17 %
Elapsed time:		       59.79 secs
Data transferred:	        4.02 MB
Response time:		        4.50 secs
Transaction rate:	        8.55 trans/sec
Throughput:		        0.07 MB/sec
Concurrency:		       38.50
Successful transactions:         511
Failed transactions:	         311
Longest transaction:	        7.28
Shortest transaction:	        0.10