Connection from SQL Developer to MS SQL. 1.Download jtds-1.2.5-dist 2.Extract Files 3.Go to SQL Developer's TOOL Menu-->Preferences-->Search like Third Party JDBC 4.Click Add Entry -->Add jtds-1.2.5.jar File. 5.Search file ntlmauth.dll into @@jtds-1.2.5-dist\x86\SSO\ and put into @@\Java\jre1.6.0_12\bin 6.Restart SQL Developer. 7.Go to New Connection and Tab of SQL Server. 8.Give username,password,hostname(instance name),TCP/IP Port. Eg. 10.Test and Check Status as Success .