为啥在 datagrip 上面可以访问的 db2, 通过 golang 写程序却抛错?

数据库连接的方法不是很懂. 如果有描述错误, 请见谅.

• 本地 datagrip 是通过 jdbc 去连接目标 as400 背后 db2 的. 开箱即用

jdbc:as400://hostname/database

• 走 https://github.com/ibmdb/go_ibm_db 去访问的时候,

package main

import (
	"database/sql"
	"fmt"
	_ "github.com/ibmdb/go_ibm_db"
)

const (
	HOSTNAME = "HOSTNAME"
    DATABASE = "DATABASE"
    UID = "UID"
    PWD = "PWD"
)

func main() {
	con := "HOSTNAME=HOSTNAMEl;DATABASE=DATABASE;PORT=50000;UID=UID;PWD=PWD"

	type Db *sql.DB
	var re Db
	re = Create_Con(con)
	err := display(re)
	if err != nil {
		fmt.Println(err)
	}
}

func Create_Con(con string) *sql.DB {
	db, err := sql.Open("go_ibm_db", con)
	if err != nil {
		fmt.Println(err)
		return nil
	}
	return db
}

func display(db *sql.DB) error {
	st, err := db.Prepare("select * from RIDCPNM")
	if err != nil {
		return err
	}
	err = execquery(st)
	if err != nil {
		return err
	}
	return nil
}

func execquery(st *sql.Stmt) error {
	rows, err := st.Query()
	if err != nil {
		return err
	}
	cols, _ := rows.Columns()
	fmt.Println(cols)
	return nil
}

抛错

SQLDriverConnect: {08001} [IBM][CLI Driver] SQL30081N  A communication error has been detected. Communicati
on protocol being used: "TCP/IP".  Communication API being used: "SOCKETS".  Location where the error was d
etected: "HOSTNAME".  Communication function detecting the error: "recv".  Protocol specific error code(
s): "10054", "*", "0".  SQLSTATE=08001

是目标 as400 所在的机器, 没有开通啥(防火墙, 端口)吗?