> For the complete documentation index, see [llms.txt](https://docs.ipwo.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ipwo.net/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/wu-fa-da-kai-wang-ye.md).

# 无法打开网页

使用代理后，如果浏览器出现：

```
无法打开网页
This site can’t be reached
ERR_PROXY_CONNECTION_FAILED
```

通常表示：

```
代理未成功建立连接
```

***

### 一、常见原因

#### 1. 代理信息填写错误

请检查：

* Host
* 端口
* 用户名
* 密码

***

#### 正确示例

```
Host: us.ipwo.net
Port: 7878
Username: username_custom_zone_us
Password: password
```

***

#### 2. 代理未生效

建议先使用 curl 测试：

```bash
curl -x http://us.ipwo.net:7878 -U username_custom_zone_us:password http://ipinfo.io
```

如果无法返回 IP 信息，说明代理连接失败。

***

#### 3. 网络环境异常

部分国内网络环境：

```
可能无法稳定连接海外代理节点
```

建议：

* 使用[海外 VPS](/huan-jing-zhun-bei/vps-yun-fu-wu-qi-tui-jian.md)
* 使用[海外云服务器](/huan-jing-zhun-bei/vps-yun-fu-wu-qi-tui-jian.md)
* 更换网络环境

***

#### 4. 浏览器代理配置错误

常见问题：

* HTTP/SOCKS5 选择错误
* 端口填写错误
* 浏览器插件未开启

***

#### 5. [DNS 解析异常](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/dns-jie-xi-shi-bai.md)

可能导致：

```
网页一直加载失败
```

建议：

* 更换 DNS
* 重启网络
* 使用海外服务器

***

### 二、推荐排查流程

```
1. 检查代理账号密码
↓
2. curl 测试代理
↓
3. 检查代理协议
↓
4. 检查 DNS
↓
5. 更换网络环境
```

***

### 三、Windows 用户注意事项

Windows 浏览器或插件配置代理时：

```
建议优先使用 HTTP 代理测试
```

避免 SOCKS5 配置错误。

***

### 四、如何确认已修复？

重新访问：

```
http://ipinfo.io
```

如果显示：

* 新 IP
* 对应国家地区

说明代理已成功生效。

***

### 五、相关文章

* [代理连接失败](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/dai-li-lian-jie-shi-bai.md)
* [407 Proxy Authentication Required](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/407-proxy-authentication-required.md)
* [超时 Timeout](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/chao-shi-timeout.md)
* [DNS 解析失败](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/dns-jie-xi-shi-bai.md)
* [如何检测代理是否生效](/dai-li-jian-ce-yu-yin-si-an-quan/ru-he-jian-ce-dai-li-shi-fou-sheng-xiao.md)
* [HTTP 与 SOCKS5 区别](/dai-li-ji-chu-zhi-shi/http-yu-socks5-qu-bie.md)


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.ipwo.net/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/wu-fa-da-kai-wang-ye.md?ask=<question>&goal=<endgoal>
```

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