connect to SQLServer2017-Linux from a windows server 2003 machine

I got a problem, we have a software that using sql server connection to show and edit data. we transferred the SQL Server 2017 from windows server to CentOS 7 . Windows 7,8,10 can recognize it and connect, but a windows 2003 machine cannot connect. it was ok while sql server was running on windows. how can I connect? thanks in advance

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