试图以访问权限禁止的方式访问套接字。正在尝试通过ssh连接到mysql数据库。下面是我的代码

import paramiko
import pymysql

# SSH连接参数
ssh_host = 'ssh.example.com'
ssh_port = 22
ssh_username = 'ssh_username'
ssh_password = 'ssh_password'

# MySQL数据库连接参数
db_host = 'db.example.com'
db_port = 3306
db_username = 'db_username'
db_password = 'db_password'
db_name = 'db_name'

try:
    # 创建SSH客户端实例
    ssh_client = paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    # 连接SSH服务器
    ssh_client.connect(ssh_host, ssh_port, ssh_username, ssh_password)

    # 创建MySQL数据库连接
    db_connection = pymysql.connect(host=db_host, port=db_port, user=db_username, passwd=db_password, db=db_name)

    # 执行数据库操作（示例：查询表格）
    cursor = db_connection.cursor()
    cursor.execute('SELECT * FROM table_name')
    results = cursor.fetchall()
    for row in results:
        print(row)

    # 关闭数据库连接
    db_connection.close()

    # 关闭SSH连接
    ssh_client.close()

except Exception as e:
    print('An error occurred:', str(e))