您的Android智能手机或平板电脑已连接到Wi-Fi网络，但您无法访问互联网。您不能访问网页，也不能流式传输音乐或向朋友发送文本。大约一分钟后，通知中心弹出“ Wi-Fi无法上网”的错误。
问题通常源于网络来源，即Wi-Fi路由器或您的Internet 服务提供商(Internet Service Provider)( ISP )。但是，您设备的设置或网络配置也可能会阻止互联网访问。在本指南中，我们将向您介绍 11 种可能的方法，以在受影响的Wi-Fi网络上重新获得 Internet 访问权限。
1. 登录网络
并非所有免费Wi-Fi网络都完全免费使用。某些网络会要求您使用电子邮件登录、完成某些任务（例如观看广告）或同意网络的使用条款，然后才能访问互联网。这些Wi-Fi网络称为“强制门户”或“强制网络”。
连接到此类网络时，设备状态栏中(Status Bar)的 Wi-Fi 图标将被取消。您的设备还应显示提示您登录的通知。点击通知并按照生成的网页上的说明访问网络上的互联网。完成所需任务或联系网络管理员获取登录凭据。
如果您没有收到登录通知，请转到设置(Settings)>网络和 Internet(Network & Internet) > Wi-Fi，然后点击Wi-Fi网络进行登录。
或者，点击Wi-Fi 网络旁边的齿轮图标，然后点击(gear icon)登录(Sign In)。
2.检查您的互联网计划
如果您达到特定使用阈值或用尽数据计划，您的Internet 服务提供商(Internet Service Provider)( ISP ) 可能会切断您网络的 Internet 访问。检查您的互联网计划的有效性（特别是如果它有上限）并确保您有足够的数据量。
如果您的ISP(ISP)遇到服务中断，您可能无法访问互联网，这可能是由于网络拥塞、服务器故障/停机或极端天气条件（大风、雨、雪等）。联系您的互联网公司或运营商网络，以确认他们是否一切正常。
3.检查路由器设置
许多路由器可以选择禁用或限制互联网访问。转到路由器的应用程序或管理面板，寻找“移动(Mobile)数据”或“互联网(Internet)访问”等选项，并确保它们已启用。
某些智能路由器会在网络闲置一段时间后自动禁用互联网访问。这是电池供电的移动路由器（也称为Mi-Fi路由器）的常见电源管理功能。
再次(Again)，转到路由器的设置并确保设备未配置为自动禁用互联网访问。
4. 忘记并重新加入网络
这是另一种值得尝试的有效故障排除技术。转到设置(Settings)>网络和 Internet(Network & Internet) > Wi-Fi，然后在没有 Internet 的情况下长按 Wi-Fi 连接。在弹出菜单上选择忘记网络。(Forget network)
或者，点击网络名称旁边的齿轮图标，然后点击(gear icon)忘记(Forget)图标。
返回Wi-Fi设置菜单并重新加入Wi-Fi网络；点击网络名称并输入密码。如果重新加入网络后仍无法访问 Internet，请继续执行下一个故障排除步骤。
5. 检查您的日期和时间设置
如果您的设备的日期和时间设置不正确，您也可能会遇到访问互联网的困难。在您的Android设备上，转至设置(Settings)>系统(System)>日期和时间(Date & time)，并确保您使用的是网络提供的时间和时区(network-provided time and time zone)。
6. 检查路由器的MAC 地址过滤器(MAC Address Filter)
可能有人篡改了路由器的 MAC 地址过滤器(router’s MAC address filter)并意外阻止了您的Android设备。如果是这种情况，即使您的设备成功连接到网络，您也无法访问互联网。
前往路由器的设置菜单并将您的设备列入网络白名单(whitelist your device on the network)。导航到安全(Security)或访问控制(Access Control)或WLAN（该选项可能因您的路由器型号而异）并检查MAC 地址过滤(MAC Address Filtering)菜单。如果您的手机或平板电脑在被阻止的设备列表中，请单击删除(Remove)或允许(Allow)以恢复互联网访问。
专业提示：(Pro Tip:)进入设置(Settings)>关于手机(About phone)> Wi-Fi MAC 地址(Wi-Fi MAC Address)或硬件信息(Hardware information)以检查您的Android设备 的MAC地址。
7.重启路由器
重启路由器或调制解调器可以解决许多连接问题。拔掉路由器的电源，一两分钟后重新插入。对于电池供电的移动热点设备，取出并重新插入电池，然后将手机重新连接到网络。
您还应该注意路由器的状态指示灯和标签。他们会通知您网络连接问题或路由器问题。例如，闪烁或静止的红灯可能表明网络电缆未正确连接。这也可能意味着您的路由器固件已过期或损坏，或者您的 ISP 端存在问题。请参阅路由器的使用说明书，了解每个状态指示灯的含义及其正常状态。
8.重启你的手机或平板电脑
如果您的其他设备可以通过Wi-Fi网络访问互联网，请重新启动手机并重试。如果问题仍然存在，则很可能是您设备的网络设置存在问题。按照下一部分中的步骤执行网络重置。
9.重置网络设置
重置手机的网络设置会将Wi-Fi、蜂窝数据和蓝牙(Bluetooth)的所有连接首选项恢复为出厂默认设置。同样(Likewise)，该操作将清除所有以前加入的网络。这意味着您需要重新输入安全Wi-Fi网络的网络凭据。
(Make)在执行网络重置之前，请确保您手边有Wi-Fi网络的密码。如果您忘记了密码，请查看本指南，了解如何在 Android 上查找 Wi-Fi 密码(finding a Wi-Fi password on Android)。以下是重置设备网络设置的方法：
1. 前往设置(Settings)>系统(System)>高级(Advanced)>重置选项(Reset options)，然后点击重置 Wi-Fi、手机和蓝牙(Reset Wi-Fi, mobile & Bluetooth)。
2. 点击重置设置(Reset Settings)并输入您的手机密码或图案以验证网络重置。
3. 再次点击重置设置(Reset Settings)按钮并等待您收到成功消息。
将您的设备重新连接到Wi-Fi网络并检查您现在是否可以访问互联网。
10.更新路由器
如果其固件过期，您的路由器可能无法传输互联网流量或随机断开和断开网络连接。(randomly drop and disconnect network connection)转到路由器的设置菜单并将固件更新到最新版本。固件(Firmware)更新可以解决性能和连接问题。
11.重置路由器
将您的无线路由器重置为其默认设置也可以解决看似无法解决的连接问题。您可以执行硬重置（使用物理重置按钮）或软重置（从应用程序或基于 Web 的管理面板）。请参阅路由器的说明手册或阅读我们关于重置无线路由器的详细指南(guide on resetting a wireless router)。
注意：(Note:)重置您的路由器会将网络凭据（用户名和密码）和其他设置（安全类型、DNS设置、防火墙配置等）恢复为出厂默认设置。
重新访问互联网
这些是在您的Android(Android)设备连接到Wi-Fi且无法访问互联网时尝试的可靠故障排除解决方案。我们非常确定，这些建议中的至少一项将帮助您重新访问互联网。如果您有任何疑问，请告诉我们哪一个对您有效。
Android Connected to Wi-Fi but No Internet? 11 Fixes to Try
Your Android smаrtphone or tablet is connectеd to a Wi-Fi nеtwork but you can’t access the internet. Υou can’t viѕit web pages, neither can you stream music or send texts to your friends. About a minute latеr, a “Wi-Fi has no internet accesѕ” error pops up іn the notification center.
The problem often stems from the network source, i.e., the Wi-Fi router or your Internet Service Provider (ISP). However, your device’s settings or network configurations could also block internet access. In this guide, we’ll walk you through 11 possible ways to regain internet access on the affected Wi-Fi network.
1. Sign In to the Network
Not all free Wi-Fi networks are exactly free to use. Some networks will require you to sign in with your email, complete certain tasks (watch ads, for example), or agree to the network’s terms of usage before accessing the internet. These Wi-Fi networks are called “Captive Portals” or “Captive Networks.”
When connected to this type of network, the Wi-Fi icon in your device’s Status Bar will be canceled out. Your device should also display a notification prompting you to sign in. Tap the notification and follow the instructions on the resulting web page to access the internet on the network. Complete the required task or contact the network administrator for the login credentials.
If you don’t get the sign-in notification, go to Settings > Network & Internet > Wi-Fi and tap the Wi-Fi network to sign in.
Alternatively, tap the gear icon next to the Wi-Fi network and tap Sign In.
2. Check Your Internet Plan
Your Internet Service Provider (ISP) may cut off your network’s internet access if you’ve hit a particular usage threshold or exhausted your data plan. Check the validity of your internet plan (especially if it’s capped) and ensure that you have sufficient data volume.
You could lose access to the internet if your ISP is experiencing a service outage, perhaps due to network congestion, server failure/downtime, or extreme weather conditions (heavy wind, rain, snow, etc). Contact your internet company or carrier network to confirm if everything is working correctly on their end.
3. Check Router Settings
Many routers have the option to disable or restrict internet access. Go to your router’s app or admin panel, look out for options like “Mobile data” or “Internet access,” and make sure they’re enabled.
Some smart routers automatically disable internet access after a certain period of inactivity on the network. This is a common power management feature on battery-powered mobile routers (also called Mi-Fi routers.)
Again, go to your router’s settings and ensure the device isn’t configured to automatically disable internet access.
4. Forget and Rejoin the Network
This is another effective troubleshooting technique worth trying. Go to Settings > Network & Internet > Wi-Fi and long-press the Wi-Fi connection without internet. Select Forget network on the pop-up menu.
Alternatively, tap the gear icon next to the network name and tap the Forget icon.
Return to the Wi-Fi settings menu and rejoin the Wi-Fi network; tap the network name and enter the password. Proceed to the next troubleshooting step if you still can’t access the internet after rejoining the network.
5. Check Your Date & Time Settings
You may also encounter difficulties accessing the internet if your device’s date and time settings are incorrect. On your Android device, go to Settings > System > Date & time and ensure you’re using the network-provided time and time zone.
6. Check Your Router’s MAC Address Filter
Someone may have tampered with the router’s MAC address filter and blocked your Android device by accident. If that’s the case, you can’t access the internet even if your device connects to the network successfully.
Head to your router’s settings menu and whitelist your device on the network. Navigate to Security or Access Control or WLAN (the option may vary depending on your router model) and check the MAC Address Filtering menu. If your phone or tablet is on the list of blocked devices, click Remove or Allow to restore internet access.
Pro Tip: Go to Settings > About phone > Wi-Fi MAC Address or Hardware information to check the MAC address of your Android device.
7. Restart Router
Power-cycling your router or modem can fix many connectivity problems. Unplug the power to the router and plug it back in after a minute or two. For battery-powered mobile hotspot devices, remove and reinsert the battery, then reconnect your phone to the network.
You should also pay attention to the router’s status lights and labels. They notify you of network connectivity issues or problems with the router. A blinking or static red light, for example, could suggest that the network cable isn’t properly connected. It could also mean your router’s firmware is out-of-date or corrupted, or that there’s a problem on your ISP’s end. Refer to the router’s instruction manual to learn what each status light means and its normal status.
8. Restart Your Phone or Tablet
If other devices but yours can access the internet on the Wi-Fi network, reboot your phone and try again. Should the issue persist, there’s most likely a problem with your device’s network settings. Follow the steps in the next section to perform a network reset.
9. Reset Network Settings
Resetting your phone’s network settings will revert all connection preferences for Wi-Fi, cellular data, and Bluetooth to factory default. Likewise, the operation will clear all previously joined networks. This means you’ll need to re-enter the network credentials for secured Wi-Fi networks.
Make sure you have the password to the Wi-Fi network handy before performing a network reset. If you’ve forgotten the password, check out this guide on finding a Wi-Fi password on Android. Here’s how to reset your device’s network settings:
1. Go to Settings > System > Advanced > Reset options and tap Reset Wi-Fi, mobile & Bluetooth.
2. Tap Reset Settings and enter your phone’s password or pattern to authenticate the network reset.
3. Tap the Reset Settings button again and wait until you get a success message.
Reconnect your device to the Wi-Fi network and check if you now have internet access.
10. Update the Router
Your router may fail to transmit internet traffic or randomly drop and disconnect network connection if its firmware is out-of-date. Go to your router’s settings menu and update the firmware to the latest version. Firmware updates can fix performance and connectivity issues.
11. Reset the Router
Resetting your wireless router to its default settings may also resolve seemingly unsolvable connectivity issues. You can either perform a hard reset (using a physical reset button) or a soft reset (from the app or web-based admin panel). Refer to the router’s instruction manual or read our detailed guide on resetting a wireless router.
Note: Resetting your router will revert the network’s credentials (username and password) and other settings (security type, DNS setup, firewall configurations, etc.) to factory defaults.
Regain Access to the Internet
These are surefire troubleshooting solutions to try when your Android device is connected to Wi-Fi with no internet access. We’re pretty sure that at least one of these recommendations will help you regain access to the internet. Let us know which one worked the magic for you, or if you have any questions.
