noman78 0 Light Poster

in some of my web pages, some links has to navigate through the directory access , not the pages reside in the same directory, every thing is workkign fine with my sys which is server2000, but when i deployed it on server 2003 it give me internel servre error 500
when i looked into log file
i got this description of error
Disallowed_Parent_Path
so is there any one can help me
its urgent thanx