一般都是伪静态规则有误导致的，网上很多伪静态代码不适合discuz x2.5的，下面给一个伪静态规则没有问题的代码：
[代码]xml代码：# 将 RewriteEngine 模式打开RewriteEngine OnOptions -IndexesRewriteBase /# Rewrite 系统规则请勿修改RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^topic-(.+).html$ portal.php?mod=topic&topic=$1&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^article-([0-9]+)-([0-9]+).html$ portal.php?mod=view&aid=$1&page=$2&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^forum-(w+)-([0-9]+).html$ forum.php?mod=forumdisplay&fid=$1&page=$2&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^thread-([0-9]+)-([0-9]+)-([0-9]+).html$ forum.php?mod=viewthread&tid=$1&extra=page%3D$3&page=$2&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^group-([0-9]+)-([0-9]+).html$ forum.php?mod=group&fid=$1&page=$2&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^space-(username|uid)-(.+).html$ home.php?mod=space&$1=$2&%1RewriteCond %{QUERY_STRING} ^(.*)$RewriteRule ^archiver/(fid|tid)-([0-9]+).html$ archiver/index.php?action=$1&value=$2&%1
如果还是不行，可以尝试更改一下伪静态规则，有可能是服务器又其他伪静态规则与本规则相冲突导致。
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