I have nginx, php 5 and php5-fpm installed on ubuntu 10.04 server edition.

After I started the nginx server, I have no problem loading the regular html pages. but all .php pages cannot be viewed, firefox just pop out a window asking me if I wnat to download the file.

I also tried IE, on IE, it just shows the source code.

I checked both nginx and php5-fpm error log files, didn't see any errors. did I miss something during the configuration?

I dont know if the problem is nginx or php5_fpm, I need someone to point me to the rite direction