NHibernate multiple sessions and stop leaking connections

transaction_scoping

using (var scope = new TransactionScope(TransactionScopeOption.Required))
{
    ISession session1 = null;
    ISession session2= null;
    ITransaction tx1 = null;
    ITransaction tx2 = null;

    bool rollback = false;
    try
    {
        session1 = factory1.OpenSession();
        tx1 = session1.BeginTransaction();
        session2 = factory2.OpenSession();
        tx2 = session2.BeginTransaction();

        //do work
        tx1.Commit();

        //throw exception

        tx2.Commit(); //never hits
    }
    catch (Exception ex)
    {
        //Log it
        _logger.Error("Something terrible has happened!", ex);
        
        rollback = true;

        if(tx1.IsActive && !tx1.WasCommitted && !tx1.WasRolledBack)
        {
            tx1.Rollback();
        }

        // KLUDGE: race condition? DTC?
        Thread.Sleep(500);

        
        // txt2.IsActive = Flase with thread.sleep()
        if(tx2.IsActive && !tx2.WasCommitted && !tx2.WasRolledBack)
        {
            tx2.Rollback();
        }
    }

    if(!rollback)
    {
        scope.Complete();
    }
}