I am developing a portlet where I have Hibernate access to SQL Server database. I set up maven dependencies for it and try to find out SQL Server connector
com.hynnet sqljdbc4-chs 4.0.2206.100
This worked for me(if you use maven)
https://search.maven.org/artifact/com.hynnet/sqljdbc4-chs/4.0.2206.100/jar