You should check your *-ds.xml file against the MSSQL JDBC documentation. There is no "Port" property for the MSSQL driver. The property is PortNumber and it is an integer. http://msdn2.microsoft.com/en-us/library/ms378087.aspx More like as not the example is the examples directory is wrong, or this was a typo when copying a file over from a JDTS datasource installation. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991039#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...