由于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。discuz X3.4版本已经移除相关代码，没有此问题，建议升级。对于使用Discuz！X3.4以下版本的同学，可以尝试采用如下方法解决！一、懒人做法，直接安装插件去discuz后台，应用--应用中心--搜索“Discuz前后台卡死”，下载由“1314学习网”，开发的“Discuz前后台卡死”插件！可解决此问题！二、discuz X3.4以下的版本自行修改代码的解决办法改动前，请务必提前做好备份！1、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']) {$shownotice = '[url=http://www.aizhanku.com/'.$basescript.]'.($notice['fixed'] ? $lang['patch_fix_complete'] : $lang['patch_fix_rigth_now']).'[/url]';}}if(!isset($_G['cookie']['checkpatch'])) {$discuz_patch->check_patch();}}if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !$shownotice && $_G['setting']['upgrade']) {$shownotice = '[url=http://www.aizhanku.com/'.$basescript.]'.$lang['upgrade_right_now'].'[/url]';}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 = '[url=http://www.aizhanku.com/'.$basescript.]'.$lang['upgrade_right_now'].'[/url]';}}dsetcookie('checkupgrade', 1, 7200);}2、前台对于前台也有影响管理员打开速度的可找到文件source\module\misc\misc_patch.php 使用如下代码进行替换！也就是只保留IP异常提醒的代码，用不到也可以删了请使用如上方法，自行尝试解决discuz低版本登录后台、前台卡、慢的问题！