Pardon the confusion with all the freely flung usage of the term SQL coupled with the vaguely descriptive "developer" and "server" terms.  This article describes the requirements for getting Oracle 's SQL Developer  client to work with Microsoft 's SQL Server  database manager.   SQL Developer supports connections to SQL Server, but in spite of Microsoft providing its own JDBC driver , SQL Developer will only work with the jTDS  driver.  Download that and point SQL Developer to it via:    Tools | Preferences…  Database | Third Party JDBC Drivers       Point SQL Developer to the jTDS driver to use with SQL Server.    If connections are being made from the Windows version and Windows authentication will be necessary, then the ntlmauth.dll  library will need to be copied into the JDK directory:   Copy from   PATH_TO_JTDS\jtds-VERSION\PLATFORM\SSO\ntlmauth.dll  Copy to   JAVA_JDK_DIRETORY\jre\bin\ntlmauth.dll  
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