web server problem

I am trying to control front panels of RT target VI's remotely.I had followed all the steps from the following link:

http://zone.ni.com/reference/en-XX/help/370622R-01/lvrthowto/remotepanels_regaincontrol/

But i am getting the following error:

Make sure labVIEW webserver is enabled on specified server

Can anybody suggest some idea to rectify this problem..... I had tried giving both port numbers 80 and 8000.But i am still getting the same error.Please help me as quick as possible