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故障描述退出登錄時(shí)出現(xiàn)”您當(dāng)前的訪問請(qǐng)求當(dāng)中含有非法字符，已經(jīng)被系統(tǒng)拒絕“錯(cuò)誤。

解決方案如下：

打開文件sourceclassdiscuz的discuz_application.php，查找

private function _xss_check() {
                static $check = array('"', '>', '<', ''', '(', ')', 'CONTENT-TRANSFER-ENCODING');
                if(isset($_GET['formhash']) && $_GET['formhash'] !== formhash()) {
                        system_error('request_tainting');
                }
                if($_SERVER['REQUEST_METHOD'] == 'GET' ) {
                        $temp = $_SERVER['REQUEST_URI'];
                } elseif(empty ($_GET['formhash'])) {
                        $temp = $_SERVER['REQUEST_URI'].file_get_contents('php://input');
                } else {
                        $temp = '';
                }
                if(!empty($temp)) {
                        $temp = strtoupper(urldecode(urldecode($temp)));
                        foreach ($check as $str) {
                                if(strpos($temp, $str) !== false) {
                                        system_error('request_tainting');
                                }
                        }
                }
                return true;
        }

替換為：

 private function _xss_check() {
                $temp = strtoupper(urldecode(urldecode($_SERVER['REQUEST_URI'])));
                if(strpos($temp, '<') !== false || strpos($temp, '"') !== false || strpos($temp, 'CONTENT-TRANSFER-ENCODING') !== false) {
                        system_error('request_tainting');
                }
                return true;
        }

官方解決解決方案：http://www.discuz.net/thread-3485502-1-1.html