大跌眼镜哉，htacess如何重写都无效~

大跌眼镜哉，,htacess怎么重写都无效~~
http.ini的没问题，

[ISAPI_Rewrite]<br />
<br />
# 3600 = 1 hour<br />
CacheClockRate 3600<br />
<br />
RepeatLimit 32<br />
<br />
# Protect httpd.ini and httpd.parse.errors files<br />
# from accessing through HTTP<br />
<br />
# duoduo Rewrite规则<br />
<br />
RewriteCond Host: (.*)stu80\.com$<br />
RewriteRule (.*) http\://www\.youyax\.com [R,I]<br />
<br />
RewriteCond Host: ^www\.stu80\.com$<br />
RewriteRule (.*) http\://www\.youyax\.com [R,I]<br />
<br />
RewriteCond Host: ^youyax\.com$<br />
RewriteRule (.*) http\://www\.youyax\.com [R,I]<br />
<br />
RewriteRule ^/forum/((Index|List|Content|admin|Vote|Message|Favor).*)$ /forum/index\.php/$1 [L]<br />
RewriteRule ^/m/((Index|List|Content|admin|Vote|Message|Favor).*)$ /m/index\.php/$1 [L]

由于西部数码的主机很贵240元，所以换空间了，改用70元的linux主机

RewriteEngine On<br />
<br />
#rewriteCond %{http_host} ^stu80\.com [NC]<br />
#rewriteRule ^(.*)$ http://www\.youyax\.com/$1 [R=301,L]<br />
<br />
#rewriteCond %{http_host} ^youyax\.com [NC]<br />
#rewriteRule ^(.*)$ http://www\.youyax\.com/$1 [R=301,L]<br />
<br />
RewriteRule forum/((Index|List|Content|admin|Vote|Message|Favor).*)$ /forum/index.php/$1<br />
#RewriteRule ^/m/((Index|List|Content|admin|Vote|Message|Favor).*)$ /m/index\.php/$1 [L]

试过很多的组合了，就是不成功~
我觉得可能是空间问题啊~~
找原因

------解决方案--------------------
SAPI_Rewrite3.1 教程