centos7.1 php7.1 连接sql2008 sqlsrv_connect出问题

[gj_cong]

1.环境服务器A sql2008R2 64bit
2.服务器B centos7.1 php7.1 连接正常
3.服务器C centos7.1 php7.1 连接不正常，方法也B一样，只是时间上不同B是半年前，C是现在。
sqlsrv_connect驱动是安装上去的。我随便改下 $serverName为 129.88.88.99。系统进入查询状态15秒说找不到服务器。
但是用真实服务就立刻出错。出现503错误！为什么呢？


$serverName = "129.88.88.88";

$connectionOptions = array(
"Database" => "db1",
"UID" => "sa",
"PWD" => "password",
"ReturnDatesAsStrings"=>"",
"characterSet"=>"UTF-8"
);
print_r($serverName);

$conn = sqlsrv_connect($serverName, $connectionOptions);


if($conn){
echo "Connected!";

}else{
print_r('111');
}