php连接mssql出错

<?php
define ( "CST_MSSQL_HOST" , "localhost" ) ;
define ( "CST_MSSQL_DBNAME" , "aaaaa" ) ;
define ( "CST_MSSQL_DBUSER" , "uaaa" ) ;
define ( "CST_MSSQL_DBPASSWORD" , "1" ) ;
define ( "CST_MSSQL_URLMAP_TABLE" , "tabURLMap" ) ;

$nConnID = mssql_connect(CST_MSSQL_HOST,CST_MSSQL_DBUSER, CST_MSSQL_DBPASSWORD) ;

if ( ! $nConnID ){
print 'ok';
}else{

print 'no';
}
?>


执行后出现如下错误，请问为什么？

Warning: mssql_connect(): Unable to connect to server: localhost in E:\hosting\Prima\Apps\htdocs\URLForwardConfig\aaa.php on line 8
ok

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我把 localhost改成 127.0.0.1 就好了.

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呵呵，楼主自问自答！

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我把 localhost改成 127.0.0.1 就好了.
有时候就是那么莫名其妙。