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:		         276 hits
Availability:		       43.40 %
Elapsed time:		       59.64 secs
Data transferred:	        3.51 MB
Response time:		        8.06 secs
Transaction rate:	        4.63 trans/sec
Throughput:		        0.06 MB/sec
Concurrency:		       37.30
Successful transactions:         277
Failed transactions:	         360
Longest transaction:	       10.59
Shortest transaction:	        0.10