php - Connect to remote mssql with public ip -

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i cannot connect remote mssql using 

mssql_connect(xx.xx.xx.xx\instancename, $user, $password);

i tried: 

 - xx.xx.xx.xx\instancename,1433   - xx.xx.xx.xx\instancename,1434  - xx.xx.xx.xx\instancename  - xx.xx.xx.xx:1434  - xx.xx.xx.xx:1433  - xx.xx.xx.xx

none of them work. however, when tried connect database sql management studio public ip, works(xx.xx.xx.xx or xx.xx.xx.xx\instancename, 1433) don't think there problems ports. works when created local mssql database , connect php using local ip, doesn't work when tried connect remote mssql(different network) using wan ip. know cause or how connect remote mssql php? thank you

i fixed problem using sqlsrv driver microsoft

$dbh = new pdo ("sqlsrv:server=xx.xx.xx.xx,1433;database=xxxx",'user','password');

:)


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