Hi Narendra,
this is due to compiling the webdynpro coding and other abap stuff in first time.
Try to increase the time out for HTTP service in SMICM transaction, so that compilation process can finish before timeout of http server is coming and terminating the connection to the browser. In that case, the workprocess will be released and the compilation will stopp before finish all.
Another approach is to compile all abap stuff with SGEN before using SOLMAN_SETUP.
Kind regards,
Christoph