nginx doesn't parse php request

Question

env: ubuntu 9.10 / use gotdeb source / php version 5.3.1 / php5-fpm installed /

php5-fpm is running , and listening 9000 port test by 2 commands below

pgrep php5-fpm
telnet localhost 9000

however if I visit from anthor computer in LAN ,using this address

http://192.168.1.103/index.php

the browser ask me to save this index.php , but if visit index.php , everything goes well

sites-enabled/default file content env: ubuntu 9.10 / use gotdeb source / php version 5.3.1 / php5-fpm installed /

php5-fpm is running , and listening 9000 port test by 2 commands below

pgrep php5-fpm
telnet localhost 9000

however if I visit from anthor computer in LAN ,using this address

http://192.168.1.103/index.php

the browser ask me to save this index.php , but if visit index.html , everything goes well

sites-enabled/default file content

location ~ \.php$ {
    fastcgi_pass 127.0.0.1:9000
    fastcgi_index index.php
    fastcgi_param SCRIPT_FILENAME /var/www/$fastcgi_script_name
    include fastcgi_params
}