Discuz！的新版本检测和补丁功能已经关闭，导致后台调用相关链接时超时，引起后台打不开
X3.4已经移除相关代码，没有此问题，建议升级
Comsenz 核心产品 Discuz! X3.4 正式版
http://www.discuz.net/thread-3825961-1-1.html

X3.4以下的版本解决办法
后台
打开：source/admincp/admincp_main.php

删除（大概在37-60行）

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);
}

原文链接：https://blog.csdn.net/lih062624/article/details/77479074