Error when sending message: 500 Internal Server Error

Question

Hi
IE is not accepting any messages,
when I try to send the messgae to the IE ( using RWB) i am getting the below error " Error when sending message: 500 Internal Server Error".
following things what i have noticed.
1. Pipleline URL is fine, both in the BS of XI and in the RFC destnation which i am maintaing on the  IE admin) URL is  "http://<host>:8000/sap/xi/engine?type=entry"
2. SICF all the XI serivess are up and running, i am able to test these service.
3. The http port is active ( SMICM )
Pls note the error is  500 Internal Server Error  
regards
Nisar

Answer 1

I think in a simple term 500 can be said as "the request cannot be processed curretnly", these options mentieoned by you are not applicable in my case.
This generally occurs due to load problem or if you are on an SP less than 12 or even if there is an administration problem---I am on PI7.0 , what are the administration problem you are talking about?
1 Check Table Space is enough. ---i had installed server recently & very few interface running.
2 Server licence Date or Time. In this case change system date and restart server.---i have recently installed server.
3 Check the service pack levels on your XI. If it is obsolete upgrade it with latest versio----Can u explain more on this?
Try restart the java stack(XI Server) and follwing services.
com.sapii.af.app ---I am not passing trough Adater framework, so i dont think this service will matters....
com.sapii.cpa.af.app.---CPA cahe is done sucessfully, as i said i am not passsing through adapter framework.
basically for a simple HTTP post what might cause 500 error if all necessary services are up and running?
regards
Nisar