Error getting SQL Server connection

[bbleafs]

For some reason I have started getting an error when my EJBs attempt to get a connection to my SQL Server database. I've never seen an exception like this, could someone help me with this:

org.jboss.util.NestedSQLException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: 7b7b0169:80b:477d42dc:34 status: ActionStatus.ABORT_ONLY >); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: 7b7b0169:80b:477d42dc:34 status: ActionStatus.ABORT_ONLY >))

[jaikiran]

Is this all that you see in the logs? Please post the entire exception stacktrace. Also post the code where you trying to get a connection. And also the -ds.xml file contents in which you have configured the datasource.

Remember to enclose these contents in a code block (use the Code button available in the message editor window) while posting