遍寻方法不得，因为上周都还能访问后台，今天大周一就不行了？
以为是公司内网的问题，结果翻墙也不行。
以为是服务器的问题，重启各种方法也不行。
以为是服务器被攻击了，结果查看日志并没有针对性的记录。
So？
查找
\source\admincp\admincp_main.php
找到第36行~60行：
$shownotice = '';
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && ($_G['setting']['showpatchnotice'] == 1 || !isset($_G['cookie']['checkpatch']))) {
$discuz_patch = new discuz_patch();
if($_G['setting']['showpatchnotice'] == 1) {
$notice = $discuz_patch->fetch_patch_notice();
if($notice['data']) {
$shownotice = '<div class="notice"><a href="'.$basescript.'?action=patch" id="notice">'.($notice['fixed'] ? $lang['patch_fix_complete'] : $lang['patch_fix_rigth_now']).'</a></div>';
}
}
if(!isset($_G['cookie']['checkpatch'])) {
$discuz_patch->check_patch();
}
}
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !$shownotice && $_G['setting']['upgrade']) {
$shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
}
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !isset($_G['cookie']['checkupgrade'])) {
$discuz_upgrade = new discuz_upgrade();
if($discuz_upgrade->check_upgrade()) {
if(empty($shownotice)) {
$shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
}
}
dsetcookie('checkupgrade', 1, 7200);
}
删除之，问题解决！