Webdynpro ABAP  appication  blank screen at portal.

hi all
all ESS application in the portal working fine.
i need to call standard webdynpro application in portal.
balnk screen is coming.
i tried with support desk...like system admiin--supportsap applicationwhere i choose webdynpro--tried to run standard application . popup opened   with username and password....after giving
i got  WebDynpro Exception: Application BC Does Not Exist error.
i have been to ITS in sicf tcode........i tried to test webgui .....its keep on opening.
that is also not working.
samp application running properly at r3.
but i am not able to call from the portal.
rz10 we maintained icm/full name host also.
i can tell that it is picking wrong hostname  .
when i tried to dedug   ..
it is taking hostname:8000....if it takes hostname.ac.in:8000  it works .
can anyone guide me from where application picking this.
Thankyou
swapna

yes anil
already maintained.
icm/host_name_ful maintanied as hostname.domain
saplocalhostfull also maintained
while debugging it is taking   hostname:8000   thats the reason blank screen is coming.
if change hostname.domain name   normal screen is coming
i can tell one thing that in smicm---http server
j2ee server configured set as false
we didnt maintain  j2ee http port
and j2ee https port.
these are necessary parameters?
need to change?
plzguide me to solve.
ESS all applications are running fine.
problem coming with Abap application.
Thankyou
swapnal

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