由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。
<br/><pre>#0 D:\ZKEYS\www\7ez1dh7pr\wwwroot\zjlsjw9941\applications\app_db.php(99): app_db::init_mysql(true, false)
#1 D:\ZKEYS\www\7ez1dh7pr\wwwroot\zjlsjw9941\applications\app_db.php(214): app_db::query('SELECT yl_value...', false)
#2 D:\ZKEYS\www\7ez1dh7pr\wwwroot\zjlsjw9941\modules\mod_config.php(23): app_db::select('ylmf_config', 'yl_value', 'yl_name = 'yl_p...')
#3 D:\ZKEYS\www\7ez1dh7pr\wwwroot\zjlsjw9941\applications\app_init.php(76): mod_config::get_one_config('yl_path_html')
#4 D:\ZKEYS\www\7ez1dh7pr\wwwroot\init.php(17): require('D:\\ZKEYS\\www\\7e...')
#5 D:\ZKEYS\www\7ez1dh7pr\wwwroot\feedback\index.php(8): require('D:\\ZKEYS\\www\\7e...')
#6 {main}</pre><br />
<b>Warning</b>:  Unknown: open(D:/ZKEYS/www/7ez1dh7pr/wwwroot/zjlsjw9941/data/session\sess_d1r5l20mkjrq7mh396iqq6q4f7, O_RDWR) failed: No such file or directory (2) in <b>Unknown</b> on line <b>0</b><br />
<br />
<b>Warning</b>:  Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (D:/ZKEYS/www/7ez1dh7pr/wwwroot/zjlsjw9941/data/session) in <b>Unknown</b> on line <b>0</b><br />