Hi, this is the important part of your error log: (java.lang.ClassNotFoundException: Unexpected error during load of: com.microsoft.sqlserver.jdbc.SQLServerDriver, msg=com/microsoft/sqlserver/jdbc/SQLServerDriver (Unsupported major.minor version 49.0)))) You are running a JBoss with JDK 1.5, but the JDBC driver seems to be compiled with 1.6 Either run JBoss with JDK 1.6 (you will need another JBoss download for that), or search a Java 1.5 compiled MSSQL JDBC driver. Hope this helps Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4225651#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...