求助：PHP连接MSSQL 2005

我已经配置了PHP.INI 同时把 PHP_MSSQL.DLL拷贝到了 windows目录下了
MSSQL我试过没有问题，连接成功

2005我也配置了TCP/IP套接字，同时1433端口在侦听状态

应用报错
Warning: mssql_connect() [function.mssql-connect]: Unable to connect to server: 127.0.0.1 in D:\wwwroot\test.php on line 2

phpinfo中属性显示
mssql
MSSQL Support enabled
Active Persistent Links 0
Active Links 0
Library version 7.0

Directive Local Value Master Value
mssql.allow_persistent On On
mssql.batchsize 0 0
mssql.compatability_mode Off Off
mssql.connect_timeout 5 5
mssql.datetimeconvert On On
mssql.max_links Unlimited Unlimited
mssql.max_persistent Unlimited Unlimited
mssql.max_procs Unlimited Unlimited
mssql.min_error_severity 10 10
mssql.min_message_severity 10 10
mssql.secure_connection Off Off
mssql.textlimit Server default Server default
mssql.textsize Server default Server default
mssql.timeout 60 60