* the Transport thread is not setup until doConnect()
         * returns and we want to suppress all communication
         * until we have properly negotiated.
         */
        synchronized (this.inLock) {
            if (prt == 139) {
                ssn139();
            } else {
                if (prt == 0) {
                    prt = DEFAULT_PORT; // 445
                }

	type MigrateNullableColumn struct {
		ID    uint
		Bonus float64 `gorm:"not null"`
		Stock float64
	}

	DB.Migrator().DropTable(&MigrateNullableColumn{})

	DB.AutoMigrate(&MigrateNullableColumn{})

	type MigrateNullableColumn2 struct {
		ID    uint
		Bonus float64
		Stock float64 `gorm:"not null"`
	}