The Db2 12.1.2 JDBC data server driver fixes a problem that can cause recovery of in-doubt transactions to fail for distributed transactions with TLS-enabled data sources on Db2 for z/OS.During recovery, any in-doubt transactions are cleaned up automatically by the transaction manager. To do that cleanup, the transaction manager opens connections to Db2 using the resync port to commit or rollback the in-doubt transactions. This connection attempts to use TLS against the Db2 resync port. Before the fix in the Db2 12.1.2 driver, if no TLS network policy is defined for the Db2 resync port, recovery of the in-doubts fails.With the fix in Db2 12.1.2, the JCC drivers retry if the TLS socket creation fails. A non-TLS connection is opened to the Db2 resync port to clean up the in-doubt XA transactions.