我无法获取Moodle网络的公钥，xlrpc安装在Ubuntu上。有人可以帮忙吗？
Moodle：1.9.4
Apache：2.2.8
PHP：5.2.4-2
调试模式出错：
Warning: openssl_csr_new() [function.openssl-csr-new]: dn: add_entry_by_NID 17 ->
Moodle (failed) in /var/www/moodle_teste/mnet/lib.php on line 361
Warning: openssl_csr_sign() [function.openssl-csr-sign]: cannot get CSR from
parameter 1 in /var/www/moodle_teste/mnet/lib.php on line 362
Warning: openssl_x509_export() [function.openssl-x509-export]: cannot get cert
from parameter 1 in /var/www/moodle_teste/mnet/lib.php on line 380
Warning: openssl_x509_free() expects parameter 1 to be resource, boolean given
in /var/www/moodle_teste/mnet/lib.php on line 381