應用與 UCenter 通訊失敗是站長們經常遇見的問題之一，通訊失敗會造成的後果也很多，如上傳頭像時報錯、新會員無法註冊、登入密碼不正確等一系列的問題，下面把 UCenter 通訊失敗的解決方法總結並與大家分享。UCenter 通訊異常，一般有下面的一些症狀：1、頭像無法上傳出現了錯誤提示：access denied for agent changed；2、網站登入提示密碼不正確或者沒響應；3、會員無法註冊；4、各應用不能同步登入和退出；5、UCenter後臺提示通訊失敗；6、頭像顯示紅X；7、登入站點後臺 => 點選 UCenter 顯示 404 或者其它錯誤。
方法/步驟
解決方法總結如下：1、檢查站點配置檔案中的 UC_APPID 與 UCenter 中的應用ID是否一致以Discuz! X2.5為例，配置檔案的目錄為：./config/config_ucenter.php 找到如下圖所示的位置
這裡的值必須與 UCenter 後臺中應用ID的值保持一致，如下圖所示。
2、應用的主 URL 地址即站點地址必須與 UCenter 後臺的應用地址相同
3、配置檔案中的通訊金鑰必須與 UCenter 後臺的通訊金鑰保持一致配置檔案的通訊金鑰可以在./config/config_ucenter.php 中看到。
這裡的金鑰必須和 UCenter 後臺的保持一致。
4、UCenter IP 地址要與伺服器的 ip 地址相同可以在配置檔案中修改 IP 地址，如圖
同理，UCenter 後臺的應用 IP 地址也要和配置檔案中的一致。應用管理中，編輯站點應用即可看到如下圖所示：
5、檢查配置檔案中的表字首是否填寫正確位置在./config/config_ucenter.php 中
6、fsockopen函式被禁用檢查 php 環境，是否禁用了 fsockopen 函式，可以通過 php.ini 來檢視該函式的情況，在這個檔案中查詢
allow_url_fopen
將其改為
allow_url_fopen = On
7、應用域名301重定向的情況301重定向可以用fsockopen函式進行測試：用下面的程式碼
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp = fsockopen("[url=http://www.example.com]www.example.com[/url]", 80, $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$errno, $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$errstr, 30);
if (!$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp) {
echo "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$errstr ($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$errno)
\n";
} else {
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$out = "GET / HTTP/1.1\r\n";
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$out .= "Host: [url=;;
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$out .= "Connection: Close\r\n\r\n";
fwrite($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp, $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$out);
while (!feof($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp)) {
echo fgets($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp, 128);
}
fclose($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$fp);
}
?>
將對應的域名更改為 UCenter 應用中的域名，然後訪問此測試指令碼,返回的內容有 301 permanently 內容，通訊也會失敗。您只要取消重定向即可，一般是 301 跳轉規則有問題。