Hi Anton
As u suggested,
words "upstream closed prematurely FastCGI stdout" show, that problem is
probably in FastCGI server.
This is what I am telling u that Nginx error log misguide us.
Actually Problem was one perl module was not installed in that so I was getting the above error.
Earlier I used apache so if any module related error then it was reflect in apache's error log ..............
that actually not happening with Nginx , this create a problem for system admin.
If any idea to get details error logs for nginx then please sugeest.
how to set fcgiwraper error log ??????