每次尝试测试我的信用卡付款时，我真的无法弄清楚我的连接有什么问题我总是得到这个回复
Cannot open log file '/var/www/html/eset/api/logs/20140829.log'
SMTP Error: Could not connect to SMTP host.
[{"ACK":"Success","PAYPAL_URL":"https:\/\/www.sandbox.paypal.com\/cgi-bin\/webscr?cmd=_express-checkout&token=EC-2YX00326YG7640224","PAYPAL_URL_EXECUTE":"https:\/\/api.sandbox.paypal.com\/v1\/payments\/payment\/PAY-3JS92160JX860163JKQADNMA\/execute","licenseinfo":{"licenseToName":"test","licenseToEmail":"test%40yahoo.com","licenseToAddress":""},"PayID":"PAY-3JS92160JX860163JKQADNMA","PayIDOld":"PAYPAL-20140829161538enG8AfXQSX"}]
编辑：然后我在我的apache2文件夹中检查了我的错误日志我遇到了这样的错误，我很难理解它。抱歉，我刚刚开始建立一个网站。
[mpm_prefork:notice] [pid 23072] AH00169: caught SIGTERM, shutting down
PHP Warning: fopen(/var/www/html/eset/api/logs/20140829.log): failed to open stream: Permission denied in /var/www/html/eset/api/index.php on line 92