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出口已变化但返回 403\u002F429 | 请求特征、频率、目标站规则 | 不一定是协议错误 |",{"type":32,"level":33,"children":410},[411],{"text":412,"type":30},"什么时候更换代理 IP",{"type":26,"children":414},[415],{"text":416,"type":30},"只有主机、端口、协议、认证和出口都确认无误，且多个目标网址持续失败时，才考虑更换同地区代理 IP。单一网站或单一账号异常，应先查目标站规则和账号环境。",{"type":32,"level":33,"children":418},[419],{"text":420,"type":30},"FAQ",{"type":32,"level":46,"children":422},[423],{"text":424,"type":30},"ping 不通时，代理一定不能用吗？",{"type":26,"children":426},[427],{"text":428,"type":30},"不一定。服务器或网络可能禁止 ICMP 响应，但代理 TCP 端口仍可连接；应以端口测试和实际代理请求结果为准。",{"type":32,"level":46,"children":430},[431],{"text":432,"type":30},"HTTP、HTTPS 和 SOCKS5 可以随便选吗？",{"type":26,"children":434},[435],{"text":436,"type":30},"不可以。应按产品提供的接入协议和客户端字段选择，协议与端口不能凭名称猜测。",{"type":32,"level":46,"children":438},[439],{"text":440,"type":30},"返回 407 需要换 IP 吗？",{"type":26,"children":442},[443],{"text":444,"type":30},"通常不需要。407 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