Ace http response code seeing 500, but server returning 200

Question

we have an http probe configure like below,the real is failing probe, and the ace says it's returning a 500 response code,however when i browse to  the server from my laptop, i get a 200, and the correct regex ( going to http://172.19.254.51/operation.aspx) . Is it possible the server could send a different response code to ace?
probe http HTTP
  interval 5
  passdetect interval 5
  receive 3
  request method get url /operation.aspx
  expect status 200 200
  open 2
  expect regex "operation"
serverfarm host AMS_AI
  probe HTTP
  rserver server1
    inservice
  rserver server2
    inservice
  rserver server3
    inservice
show probe HTTP detail
     real      : server3I[0]
                       172.19.254.51   1925172    24779      1900393    FAILED 
   Socket state        : CLOSED
   No. Passed states   : 5646         No. Failed states : 5646
   No. Probes skipped  : 0         Last status code  : 500
   No. Out of Sockets  : 0         No. Internal error: 0
   Last disconnect err : Received invalid status code
   Last probe time     : Wed Feb 23 10:53:21 2011
   Last fail time      : Wed Feb 23 09:21:29 2011
   Last active time    : Wed Feb 23 03:51:41 2011

Answer 1

you will probably have to configure the HTTP header of the probe you send. Maybe the web server
is expecting specific fields (virtual hosts ?)