很难想象就在二十年前，世界上只有大约百分之一的人口上网。如今，超过 43 亿人(more than 4.3 billion people)在积极使用互联网，占全球人口的一半以上。这就是拥有互联网连接的重要性。
不过，有些事情可能会令人沮丧，因为无法访问互联网。一方面，您可以连接到您的无线路由器，但另一方面，您会在互联网连接图标上看到可怕的“无法访问互联网”黄色三角形。(No Internet Access)
虽然很难立即检测问题出在您的路由器、计算机还是您的Internet 服务提供商(Internet Service Provider)( ISP )，但您可以修复此错误并重新上线。我们将在本指南中向您展示如何操作。
此外，我们制作了一个关于以下一些步骤的快速YouTube 视频(YouTube video)，因此请先检查一下，如果它不能解决您的问题，请返回此处获取更多解决方案。
如何修复没有 Internet 连接错误(How To Fix No Internet Connection Errors)
- 排除误报。
- 检查路由器灯。
- 重新启动调制解调器和路由器。
- 运行 Windows 网络疑难解答。
- 检查 IP 地址。
- 检查网卡。
- 检查 MAC 地址过滤。
- 重置 TCP/IP。
- 刷新 DNS。
- 禁用安全软件。
- 更新(Update)无线驱动程序和网络适配器驱动程序。
- 升级路由器固件。
- 重置你的路由器。
- 重置您的网络。
没有互联网连接的原因(Reasons For No Internet Connection)
涉及任何网络问题的主要罪魁祸首是您的设备（计算机、平板电脑或智能手机）和无线路由器。
路由器方面的问题可能是任何东西，从过时的硬件到有缺陷的固件或旧的基础设施、损坏的电缆、不稳定的信号强度以及太多人同时连接到网络。尽管这种情况很少见，但检查以确保您的路由器上没有恶意软件(make sure there is no malware on your router)也是一个好主意。
如果这些设备中的任何一个出现问题，那么您会看到诸如已连接但没有互联网(connected but no internet )或没有互联网连接(no internet connection)等错误消息。
如果您遇到此常见问题，请采取以下步骤。我们将首先解决更简单的故障排除步骤，然后升级到更高级的解决方案。
排除误报(Rule Out False Alarms)
在尝试修复路由器或硬件之前，请执行以下操作以排除任何错误警报：
- 检查您的网络硬件是否已打开并插入。
- 访问(Visit)多个网站，因为有时您正在访问的网站可能会暂时离线，因此您最终会认为您的连接有问题。
- 确认(Confirm)您的其他设备是否可以正常连接。如果只是您的计算机或移动设备，则可能是该特定设备上的错误配置设置。如果所有设备上都没有互联网连接，则问题可能出在您的网络设备上。
- 如果可用，请切换到有线连接或尝试其他连接。如果您可以使用这些设置中的任何一个上网，则您的路由器可能有故障，或者您的ISP与您的家庭或办公室之间的连接或ISP的连接存在问题。
- 重新启动计算机以清除临时软件故障并再次尝试连接。
- 检查您的WiFi是否已在您的设备上打开或启用。大多数笔记本电脑都有一个WiFi按钮或开关，如果关闭，可能会导致无法访问互联网。
- 如果飞行模式(Airplane mode)打开，请禁用它。您可以使用笔记本电脑上的飞行模式(Airplane mode)按钮或从Windows PC的操作中心(Action Center)执行此操作。
- 验证您使用的是正确的SSID（路由器名称）和安全密钥。重新输入(Re-enter)无线密码并再次尝试连接。您可能已更改它并使用旧密码。
- 重新定位(Reposition)您的路由器或计算机。这有助于在两个设备之间保持强信号并防止连接问题。您还可以获得一个范围扩展器，以帮助每次获得强信号。
- 如果您的帐户被阻止，请联系您的ISP 。如果您违反服务(Service)条款、超出带宽限制或未能更新/支付订阅费用，则可能发生这种情况。
检查路由器灯(Check Router Lights)
您的路由器正面显示不同的状态指示灯，根据您的型号不同，带有不同的标签。其中包括无线灯、以太网(Ethernet)灯（用于有线网络）、发送/接收灯（快速闪烁）和Ready/Service/Connect灯。
检查Ready/Service/Connect灯是否常亮，表示连接良好。如果它熄灭或闪烁，则说明连接存在问题。但如果它仍然稳定并且没有互联网连接，请与您的 ISP 确认是否出现中断。
重启调制解调器和路由器(Restart Modem & Router)
为此，请从调制解调器和路由器上拔下电源插头，让它们保持拔出状态大约两分钟。
接下来，插入调制解调器，让它启动，然后插入路由器。等待几分钟让两个设备重新启动并确认它们工作正常。这有助于重置任何背景问题并刷新路由器的内存内容。
如果其中任何一个都没有灯，则可能是硬件问题。如果重启调制解调器和路由器后仍然没有互联网连接，请尝试下一步。
运行 Windows 网络疑难解答(Run Windows Network Troubleshooter)
如果您的连接问题影响多个设备，则无需执行此步骤。但是，如果它仅用于您的Windows计算机，则网络设置可能存在问题。
- 打开Settings>Network & Internet。
- 选择网络疑难解答(Network Troubleshooter)并按照步骤诊断和纠正问题。它可能无法解决所有问题，但可以解决大多数与网络相关的问题。
检查 IP 地址(Check IP Address)
可以连接到您的无线路由器，但仍然没有互联网连接。
当路由器与您的ISP的连接出现问题时会发生这种情况，因此它可以在网络上运行，但由于无法访问 Internet，因此它没有有效的公共 IP 地址。因此，您无法通过 Internet 发送或请求数据。
- 登录您的路由器并转到Settings > Status（或网络状态(Network Status)）以检查 IP 地址是否有效。如果状态为Off或Disabled，并且 IP 地址没有数字，则路由器未从您的ISP获取 IP 地址。
- 您可以使用更新(Renew)（或类似）按钮请求新的 IP 地址。如果这不起作用，请致电您的ISP以获得进一步的指导，因为问题可能来自他们的最终问题。
另一种更改 IP 地址的方法是自动获取一个。当您的设备设置为使用静态 IP 地址但路由器不允许它在网络上或该地址用于错误的网络时，这会有所帮助。
- 如果您使用的是 Windows，请转到Control Panel > Network and Internet.如果您在图标视图中，只需单击网络(Network)和共享中心(Sharing Center)。
- 单击Network and Sharing Center > Change adapter settings，然后双击连接。根据您连接到Internet的方式，您将单击以太网(Ethernet)或Wi-Fi。
- 选择属性(Properties)，然后双击Internet 协议版本 4 或 IPv4(Internet Protocol Version 4 or IPv4)。
- 此时，您可以更改 IP 地址（但它将保持静态），或选择自动获取 IP 地址(Obtain an IP address automatically)，以便路由器自动为计算机分配一个 IP 地址。
检查网卡(Check Network Card)
您的网卡也可能导致互联网连接问题，因此您可以对其进行故障排除以排除任何问题。
- 右键单击Start > Device Manager
- 展开网络适配器(Network Adapters)类别并检查网络适配器旁边的任何黄色感叹号。如果没有，则表示网卡工作正常，但如果看到感叹号，请右键单击它并选择禁用设备(Disable device)。
- 等待大约两分钟，然后右键单击Network adapter > Enable 设备(device)。检查标记是否消失，然后再次尝试您的互联网连接。
如果标记仍然存在，则可能是网卡有问题。在这种情况下，请重新启动计算机或将其交给专业的计算机技术人员进行维修或更换。
检查 MAC 地址过滤(Check MAC Address Filtering)
如果您的路由器设置了MAC地址过滤，您可能无法访问 Internet。如果设备没有特定的MAC地址，此设置会阻止设备连接到路由器。
解决此问题的最简单方法是将您的MAC地址添加到已批准的列表中。
Reset TCP/IP
TCP/IP是一组通过 Internet 连接网络设备并指定数据交换方式的协议。重置TCP/IPCommand Prompt中输入一些命令。
- 在搜索栏中键入cmd ，然后选择(cmd)Command Prompt > Run as administrator.
- 键入netsh int ip reset并按回车键。让它完成，然后退出命令提示符(Command Prompt)。完成后重新启动计算机。
刷新 DNS(Flush DNS)
此方法还涉及使用命令提示符(Command Prompt)。
- (Type CMD)在搜索栏中输入CMD并右键单击Command Prompt > Run as administrator。
- 输入ipconfig /flushdns以刷新和重置计算机的DNS设置，然后重新启动 PC 以检查 Internet 连接是否恢复。
禁用安全软件(Disable Security Software)
您计算机的防火墙和防病毒软件可能会阻止您上网。
防火墙(Firewalls)可防止不需要的网络流量破坏计算机的正常功能，但它们也可能发生故障并阻止真正的流量。同样，如果您在一台计算机上有两个防火墙，它们可能会发生冲突并阻止互联网流量。
要解决此问题，请禁用任何第三方防病毒软件或暂时禁用计算机的防火墙(disable your computer’s firewall temporarily)，然后查看连接是否已恢复。您还可以运行恶意软件扫描，以排除任何可能破坏您的互联网连接的恶意软件。
更新无线驱动程序和网络适配器驱动程序(Update Wireless Drivers & Network Adapter Driver)
设备(Device)驱动程序提供有关您的操作系统和其他软件如何与计算机上的特定硬件交互的信息。如果您仍然没有互联网连接，请检查计算机上的驱动程序更新。
- 右键单击Start > Device Manager，然后右键单击您的无线驱动程序并选择更新驱动程序。(Update driver.)
- 选择自动(S)搜索更新的驱动程序软件(earch automatically for updated driver software )或浏览您的计算机以查找驱动程序软件( Browse your computer for driver software)，然后单击浏览。(Browse.)
您也可以卸载驱动程序，然后从设备制造商的站点重新安装正确的驱动程序。完成后重新启动计算机，并测试互联网连接以查看它是否有效。
升级路由器固件(Upgrade Router Firmware)
升级路由器固件因每台路由器而异，但也有一些类似的步骤。但是，建议您查看路由器随附的设备制造商用户手册，或上网查看路由器品牌和型号的具体说明。
- 从制造商的网站下载(Download)正确的固件。转到路由器的硬件版本下载页面(download page)并选择正确的文件。
- 大多数较新的路由器在管理界面中都有一个页面，该页面将检查固件更新并让您直接升级，如下所示。如果没有，请下载固件文件并继续。
- 登录到路由器的管理控制台(admin console)，然后在设置下找到固件部分——通常是管理(Management )或高级( Advanced)。确认您下载的路由器固件版本与您使用的当前版本相比是最新版本。
- 将固件文件移动到路由器。您可以从用户手册或网站上的说明中搜索相关说明。让安装继续不间断。
- 该过程完成后重新启动路由器。
重置您的路由器(Reset Your Router)
您可以通过按下路由器(reset your router)上的物理重置按钮（通常是一个小的凹入式针孔）来重置您的路由器，并按住它大约 15 秒。此时路由器灯会闪烁，路由器会重启。
如果您的路由器没有此按钮，请登录路由器并从设置面板运行恢复出厂设置。(factory reset)
重置您的网络(Reset Your Network)
如果您仍然没有互联网连接，请重置您的网络设置。
- 打开Settings > Network & Internet > Status.
- 单击Network reset > Reset now以删除所有网络适配器并将您的网络设置恢复为默认设置。这意味着您需要重新设置它，但这可能有助于恢复您的互联网连接。
如果重置路由器和网络后没有任何效果，则您的设备可能有故障。如果是您的路由器，您可以尝试使用USB网络适配器，联系您的ISP提供商或完全更换它。
您的WiFi适配器或相关硬件可能有缺陷，或者您的计算机需要维修。同样，您的计算机的操作系统可能已损坏，在这种情况下，您可能必须删除所有内容并重新安装，但这应该作为最后的手段。
我们希望此处描述的步骤将帮助您解决连接问题。希望(Hopefully)您不必求助于恢复出厂设置，因为大多数较早的步骤往往会解决它。
Can Connect to Wireless Router, but not to the Internet?
It’ѕ hard to imagine that just two decades ago, only about one percent of the world’s populаtion was online. Today, more than 4.3 billion people are actively using the internet, which is more than half of the global population. That’s how important having an internet connection is.
A few things can be quite frustrating as not having internet access though. On the one hand, you can connect to your wireless router, but on the other, you get the dreaded No Internet Access yellow triangle over the internet connection icon.
While it’s not easy to immediately detect whether the problem is with your router, computer, or your Internet Service Provider (ISP), you can fix this error and get back online. We’re going to show you how in this guide.
Also, we made a quick YouTube video on some of the steps that we have below so check it out first and if it doesn’t solve your problem, come back here for more solutions.
How To Fix No Internet Connection Errors
- Rule out false alarms.
- Check router lights.
- Restart modem and router.
- Run Windows Network Troubleshooter.
- Check IP address.
- Check network card.
- Check MAC Address filtering.
- Reset TCP/IP.
- Flush DNS.
- Disable security software.
- Update wireless drivers and network adapter driver.
- Upgrade router firmware.
- Reset your router.
- Reset your network.
Reasons For No Internet Connection
The main culprits involved with any networking issues are your device (computer, tablet, or smartphone) and wireless router.
Router-side issues could be anything from outdated hardware to buggy firmware or old infrastructure, damaged cables, spotty signal strength, and too many people connected at the same time to the network. Even though it’s rare, it’s also a good idea to check to make sure there is no malware on your router.
If there’s a problem with any of these devices, then you’ll see errors like connected but no internet or no internet connection messages.
What follows are some steps to take if you’re experiencing this common problem. We’ll tackle the simpler troubleshooting steps first, and move up to more advanced solutions.
Rule Out False Alarms
Before you try to fix your router or hardware, rule out any false alarms by doing the following:
- Check that your network hardware is switched on and plugged in.
- Visit several websites as sometimes the one you’re visiting could be temporarily offline so you end up assuming your connection is faulty.
- Confirm whether your other devices can connect properly. If it’s only your computer or your mobile device, it could be a misconfigured setting on that particular device. If there’s no internet connection on all devices, the problem could be your network equipment.
- Switch to a wired connection if available or try a different connection. If you can get online using any of these setups, your router is likely faulty or there’s a problem with the connection between your ISP and your home or office, or the ISP’s connection.
- Restart your computer to clear up temporary software glitches and try connecting again.
- Check whether your WiFi is turned on or enabled on your device. Most laptops have a WiFi button or switch which, if turned off, could result in no internet access.
- Disable Airplane mode if it’s on. You can do this using the Airplane mode button on your laptop, or from the Action Center for a Windows PC.
- Verify that you’re using the right SSID (router name) and security key. Re-enter the wireless password and try to connect again. It’s possible that you may have changed it and are using the old password.
- Reposition your router or computer. This helps maintain a strong signal between the two devices and prevents connectivity issues. You can also get a range extender to help get strong signals every time.
- Contact your ISP if your account is blocked. This can happen if you violate the Terms of Service, exceed bandwidth limits, or fail to update/pay your subscription fees.
Check Router Lights
Your router has different status lights displayed on the front, with different labels depending on the model you have. These include the wireless light, Ethernet light (for wired networks), send/receive lights (blink rapidly) and the Ready/Service/Connect lights.
Check whether the Ready/Service/Connect lights are solid, which indicates a good connection. If it’s out or blinking, there’s a problem with the connection. But if it’s still solid and there’s no internet connection, check with your ISP if there’s an outage.
Restart Modem & Router
To do this, pull the power plug from your modem and router and let them stay unplugged for about two or so minutes.
Next, plug in the modem, let it boot up, and then plug in the router. Wait a few minutes for both devices to start up again and confirm they’re working correctly. This helps reset any background issues and flushes the router’s memory contents.
If there are no lights on any of them, it’s likely a hardware issue. If you still have no internet connection after restarting the modem and router, try the next step.
Run Windows Network Troubleshooter
If your connection problem affects multiple devices, this step won’t be necessary. However, if it’s only with your Windows computer, there could be an issue with the network settings.
- Open Settings>Network & Internet.
- Select Network Troubleshooter and follow the steps to diagnose and rectify the issue. It may not fix everything, but it’ll address most network-related problems.
Check IP Address
It’s possible to connect to your wireless router and still have no internet connection.
This happens when there’s an issue with the router’s connection to your ISP, so it’ll work on the network but won’t have a valid public IP address as it can’t reach the internet. Consequently, you can’t send or request data over the internet.
- Log into your router and go to Settings > Status (or Network Status) to check if the IP address is valid. If the status says Off or Disabled, and there are not numbers for the IP address, the router isn’t getting an IP address from your ISP.
- You can request a new IP address by using the Renew (or similar) button. If this doesn’t work, call your ISP for further guidance as the issue could be from their end.
Another way of changing your IP address is by obtaining one automatically. This helps when your device is set up to use a static IP address but the router won’t allow it on the network or the address is for the wrong network.
- If you’re using Windows, go to Control Panel > Network and Internet. If you’re in icon view, just click on Network and Sharing Center.
- Click Network and Sharing Center > Change adapter settings and double-click the connection. Depending on how you are connecting to the Internet, you will click on either Ethernet or Wi-Fi.
- Select Properties and then double-click Internet Protocol Version 4 or IPv4.
- At this point, you can change the IP address (but it will remain static), or choose Obtain an IP address automatically so that the router automatically assigns one to the computer.
Check Network Card
Your network card could also cause internet connectivity issues, so you can troubleshoot it to rule out any problems.
- Right-click Start > Device Manager
- Expand the Network Adapters category and check for any yellow exclamation mark beside your network adapter. If there’s none, the network card is working properly, but if you see the exclamation mark, right-click on it and select Disable device.
- Wait about two minutes and then right click Network adapter > Enable device. Check if the mark is gone, and then try your internet connection again.
If the mark is still there, there could be a problem with the network card. In this case, restart your computer or take it to a professional computer technician to have it repaired or replaced.
Check MAC Address Filtering
If your router has MAC address filtering set up, you may not have internet access. This setting blocks devices from connecting to the router if they don’t have a specific MAC address.
The easiest way to resolve this is to add your MAC address to the list of approved ones.
Reset TCP/IP
TCP/IP is a set of protocols that connect network devices over the internet and specify how data is exchanged. Resetting the TCP/IP involves entering a few commands into Command Prompt.
- Type cmd in the search bar and select Command Prompt > Run as administrator.
- Type netsh int ip reset and press enter. Allow it to complete and then exit the Command Prompt. Restart your computer once it’s done.
Flush DNS
This method also involves using a Command Prompt.
- Type CMD in the search bar and right click Command Prompt > Run as administrator.
- Enter ipconfig /flushdns to refresh and reset your computer’s DNS settings and restart your PC to check if the internet connection is back.
Disable Security Software
Your computer’s firewall and antivirus can prevent you from getting online.
Firewalls prevent unwanted network traffic from disrupting your computer’s normal functions, but they can also malfunction and block genuine traffic. Similarly, if you have two firewalls on one computer, they can conflict and block internet traffic.
To resolve this, disable any third-party antivirus or disable your computer’s firewall temporarily, and see if the connection is restored. You can also run a malware scan just to rule out any malware that could’ve disrupted your internet connection.
Update Wireless Drivers & Network Adapter Driver
Device drivers provide information about how your operating system and other software interact with particular hardware on your computer. If you still have no internet connection, check for driver updates on your computer.
- Right click Start > Device Manager, and then right-click on your wireless driver and select Update driver.
- Select to Search automatically for updated driver software or Browse your computer for driver software and then click Browse.
You can also uninstall the driver, and reinstall the correct drivers from the device manufacturer’s site. Restart the computer once done, and test the internet connection to see if it works.
Upgrade Router Firmware
Upgrading router firmware varies with every router, but there are some similar steps to take. However, it’s advisable to check the device manufacturer’s user manual that came with your router, or go online and check for specific instructions for your router’s make and model.
- Download the correct firmware from the manufacturer’s website. Go to the router’s hardware version download page and pick the right file.
- Most newer routers have a page in the admin interface that will check for firmware updates and let you upgrade directly like shown below. If not, download the firmware file and continue.
- Log into the admin console on your router, and locate the firmware section under settings – usually Management or Advanced. Confirm that your router’s firmware version you downloaded is the latest one compared to the current one you’re using.
- Move the firmware file to your router. You can search for instructions for this from the user manual or instructions on the website. Let the installation go on uninterrupted.
- Restart your router once the process is complete.
Reset Your Router
You can reset your router by pressing the physical reset button (usually a small recessed pinhole) on your router and hold it in for about 15 seconds. At this point, the router lights will blink and the router will restart.
If your router doesn’t have this button, log into the router and run factory reset from the settings panel.
Reset Your Network
If you still have no internet connection, reset your network settings.
- Open Settings > Network & Internet > Status.
- Click Network reset > Reset now to remove all network adapters and return your network settings to the default settings. This means you’ll need to set it up all over again, but it could help restore your internet connection.
If nothing worked after resetting your router and network, you likely have faulty equipment. If it’s your router, you can try using a USB network adapter, contact your ISP provider or replace it altogether.
Your WiFi adapter or related hardware could be defective, or, your computer needs servicing. Similarly, your computer’s operating system could be corrupted, in which case you may have to erase everything and reinstall it but this should be done as a last resort.
We hope the steps described here will help you solve your connection issue. Hopefully, you won’t have to resort to factory resets, as most of the earlier steps tend to resolve it.
