Mac用户可能会遇到阻止其机器连接到Wi-Fi的错误或故障。可能存在网络或路由器问题、宽带提供商停机、macOS 问题、选择错误的SSID或输入错误的Wi-Fi 网络密码(Wi-Fi network password)等。
无论出于何种原因，本指南都列出了一些步骤和提示，以帮助您在Mac无法连接到Wi-Fi时进行故障排除。
当您的 Mac 无法连接到 Wi-Fi 时该怎么办(What to Do When Your Mac Won’t Connect to Wi-Fi)
幸运的是，您可以按照下面的各种修复来识别问题并解决它。
快速提示(Quick Tips)
- 检查您是否尝试连接到正确的SSID，或者您是否使用了正确的Wi-Fi登录凭据。
- 如果可能，请连接(Connect)到不同的Wi-Fi网络，以确定问题出在计算机还是主要Wi-Fi路由器上。
- 重启你的路由器。如果路由器周围有金属物体、微波炉、婴儿监视器、文件柜、无线耳机、视频游戏控制器、活动跟踪器、对讲机或其他无线电设备等干扰，它们可能会影响连接。移动或移除此类物体，或者将您的Mac移近路由器并尝试再次连接到Wi-Fi。
- 获取Wi-Fi 助推器来扩展您的无线网络(Wi-Fi booster to expand your wireless network)或使用备用路由器作为 Wi-Fi 扩展器(use a spare router as a Wi-Fi extender)，而不是四处移动。
- 确保(Make)您的路由器存放在阴凉干燥的地方并且没有被遮盖，否则它可能会过热并停止正常工作。
- 检查菜单栏中是否出现Wi-Fi图标。(Wi-Fi)如果没有，请选择菜单(Menu)>系统(System) 偏好设置(Preferences)>网络(Network)。在菜单栏中(Show Wi-Fi status in menu bar)选择Wi-Fi >显示 Wi-Fi 状态。
- 重新启动Mac并尝试再次连接到Wi-Fi。
- 检查问题是否与您的宽带提供商有关。您可以使用通过以太网(Ethernet)连接的设备快速检查这一点，看看您是否可以访问Internet。
- 如果Wi-Fi网络被隐藏，请选择Wi-Fi菜单，然后选择加入其他网络(Join Other Network)或其他(Other)。输入(Enter)网络名称、安全性和密码详细信息，然后选择加入(Join)。
- 尝试使用以太网(Ethernet)连接，看看是外部问题还是您的Mac有问题。获取以太网(Ethernet)电缆并将其连接到路由器和Mac上的(Mac)以太网(Ethernet)端口。如果您的Mac没有以太网(Ethernet)端口，请获取以太网(Ethernet)适配器，例如Apple Thunderbolt 至千兆以太网适配器(Apple Thunderbolt to Gigabit Ethernet Adapter)或Belkin USB-C 至千兆以太网适配器(Belkin USB-C to Gigabit Ethernet Adapter)。
- 断开Mac 上的蓝牙。(Bluetooth)从菜单栏中打开控制中心并禁用(Control Center)蓝牙(Bluetooth)。
- 如果您没有在可用网络列表中看到您的 Wi-Fi 网络，请创建网络。选择菜单栏中的Wi-Fi状态图标，然后选择Network Preferences。选择Add（加号）按钮，选择interface，输入服务名称(name)，然后选择Create。
- 如果您尝试连接的Wi-Fi网络是由AirPort Time Capsule或AirPort基站创建的，请拔下电源线以重新启动设备，并在几分钟后重新插入。如果网络再次可用，请尝试连接到它。
- 更新 macOS。选择菜单(Menu)>系统偏好设置(System Preferences)>软件更新(Software Update)以检查并安装可用更新。
- 当您的Mac尝试连接到Wi-Fi时，它会检查并检测任何可能影响其创建稳定、快速和安全连接能力的问题。检查Wi- Fi 状态菜单中的 Wi- Fi 建议以获取任何推荐的解决方案。(Wi-Fi Recommendations)
- 忘记网络并尝试重新连接。选择系统偏好设置(System Preferences)>网络(Network)> Wi-Fi >高级(Advanced)。选择网络，按 (-) 按钮并选择OK。
- 更改您的 Wi-Fi 频道(Change your Wi-Fi channel)。此外，在您的路由器设置中，请确保您没有启用MAC 地址过滤(MAC address filtering)或其他限制性安全功能。
- 重置(Reset the SMC, PRAM or NVRAM)Mac 上的 SMC、PRAM 或 NVRAM。
- 如果问题出在路由器上，您可以尝试增强信号强度(boost the signal strength)或更换新的。
- 请联系您的网络管理员或ISP以确保他们没有问题。
- 使用个人热点连接到Wi-Fi。根据您的移动运营商，您可以与Mac共享手机的蜂窝数据连接并访问网络。如果您可以通过热点连接，则问题很可能出在您的路由器或ISP上，而不是您的Mac上。
- 如果问题出在您的路由器上，并且您无法修复它，您可以将其更换为新路由器(replace it with a new router)。
使用 Apple 无线诊断(Use Apple Wireless Diagnostics)
无线诊断是(Diagnostics)Mac附带的一个鲜为人知的实用程序，可帮助您分析和诊断 Wi-Fi 连接。该实用程序有助于分析您的连接，尤其是当您可以连接到路由器但无法流式传输视频或音乐、加载页面或接收电子邮件时。
打开无线诊断：
- 关闭所有打开的应用程序并尝试连接到您的Wi-Fi。
- 按住Option键，选择Wi-Fi图标，然后从菜单中选择打开无线诊断。(Open Wireless Diagnostics)
- 如果出现提示，请键入您的Mac用户凭据（名称和密码），该实用程序将开始分析您的无线环境。
- 无线诊断将询问有关任何其他路由器或您的基站的更多信息，这些信息将包含在它保存到您的Mac的诊断文件中。分析完成后，您将收到一个压缩文件，其中列出了该实用程序检测到的问题以及适用于您的 Wi-Fi 连接的可能解决方案和最佳实践。
- 诊断文件保存在/var/tmp文件夹中，您可以从Dock中的Finder打开该文件夹。选择Finder > Go > Go to Folder，键入/var/tmp作为文件夹名称，然后选择Go打开包含诊断文件的文件夹。查找以WirelessDiagnostics开头并以.tar.gz结尾的文件。
注意(Note)：要查看诊断报告中项目的详细信息，请选择每个项目旁边的信息按钮。在根据诊断建议更改它们之前，请(Make)务必备份或记下您的路由器或网络设置，以防您以后需要使用这些设置。
续订 DHCP 租约 (Renew DHCP Lease )
DHCP（动态主机配置协议(Dynamic Host Configuration Protocol)）向网络上的设备提供 IP 地址，以便它们可以通信。其中包括您的Mac、路由器、电话和网络上连接的任何其他设备。
如果DHCP 租约(DHCP Lease)有问题，它可以解释您的Mac无法连接到Wi-Fi 的(Wi-Fi)原因。续租可能会解决问题。
- 选择菜单(Menu)>系统偏好设置(System Preferences)>网络(Network)。
- 选择Wi-Fi >高级(Advanced)。
- TCP/IP选项卡下选择续订 DHCP 租约(Renew DHCP Lease)。
以安全模式启动 Mac(Start Your Mac in Safe Mode)
安全模式(Mode)是Mac中的启动选项之一，可帮助您确定问题是否由Mac启动时加载的软件或应用程序引起。安全模式(Mode)可防止在Mac启动过程中启动软件，包括登录项、第三方字体和非必要的系统扩展。
您可以将 Mac 启动到安全模式(boot your Mac into Safe Mode)并检查Wi-Fi连接问题是否仍然存在。
- 重新启动Mac并在(Mac)Mac启动时 立即按下Shift键。(Shift)
- 出现登录屏幕时，松开Shift键并登录 macOS。
- 如果要求再次登录，请输入您的登录详细信息，您将在窗口右上角看到“安全启动”字样。
注意：如果在(Note)安全模式下(Safe Mode)没有出现问题，可能已经解决了，您可以正常重启电脑并测试是否可以重新连接Wi-Fi。但是，如果您在安全模式下仍然遇到(Safe Mode)Wi-Fi连接问题，请重新安装 macOS 并更新Apple软件和第三方应用程序。
运行 Apple 诊断程序(Run Apple Diagnostics)
Mac仍然无法连接到Wi-Fi吗？运行 Apple(Run Apple) 诊断程序(Diagnostics)以检查网络或Wi-Fi问题。
- 拔下连接到Mac的所有外围设备并关闭计算机。
- 按住D键 的同时打开Mac电源。
- 如果出现要求您选择语言的屏幕，请选择该语言，然后等待几分钟。
图片：08-mac-wont-connect-to-Wi-Fi-troubleshooting-tips-select-language-screen
如果出现问题，Apple 诊断程序(Apple Diagnostics)会建议可能的解决方案。
修复 Mac 上的 Wi-Fi 问题(Fix Wi-Fi Issues on Mac)
借助本指南中的提示和修复，您应该能够解决问题并重新连接。但是，如果这些步骤都没有帮助，请预约 Genius Bar(Genius Bar appointment)以修复您的 Mac。
当您可以连接到路由器但无法访问互联网(can connect to your router but can’t access the internet)以及如何在没有互联网提供商的情况下获得 Wi-Fi(how to get Wi-Fi without an internet provider)时，我们提供了更多指南。
发表评论，让我们知道哪些提示或解决方案对您有用。
Mac Won’t Connect to Wi-Fi? Troubleshooting Tips To Get Back Online
Mac users can experience bugs оr glitches that prevent their maсhines from connectіng to Wi-Fi. There could be an issue with the network or the router, downtіmе on the broadband providеr’s end, an issue with macOS, selecting the wrong ЅSID, or entering the wrong Wi-Fi network password, among others.
Whatever the reason, this guide lists some steps and tips to help troubleshoot when your Mac won’t connect to Wi-Fi.
What to Do When Your Mac Won’t Connect to Wi-Fi
Fortunately, you can follow the various fixes below to identify the problem and resolve it.
Quick Tips
- Check whether you’re trying to connect to the right SSID or that you’re using the correct Wi-Fi login credentials.
- Connect to a different Wi-Fi network if possible, to identify if the issue is with the computer or your primary Wi-Fi router.
- Restart your router. If there’s any interference like metal objects, a microwave oven, baby monitors, filing cabinets, wireless headset, video game controllers, activity trackers, walkie talkies or other radios around the router, they may affect the connection. Move or remove such objects, or move your Mac closer to the router and try connecting to Wi-Fi again.
- Get a Wi-Fi booster to expand your wireless network or use a spare router as a Wi-Fi extender instead of moving things around.
- Make sure your router is kept in a cool, dry spot and that it isn’t covered, otherwise it may overheat and stop working properly.
- Check whether the Wi-Fi icon appears in the menu bar. If not, select Menu > System Preferences > Network. Select Wi-Fi > Show Wi-Fi status in menu bar.
- Restart your Mac and try connecting to Wi-Fi again.
- Check whether the issue could be with your broadband provider. You can quickly check this by using a device connected via Ethernet to see if you can reach the Internet.
- If the Wi-Fi network is hidden, select the Wi-Fi menu and then select Join Other Network or Other. Enter the network name, security and password details and select Join.
- If you don’t see your Wi-Fi network in the list of available networks, create the network. Select the Wi-Fi status icon in the menu bar and then select Network Preferences. Select the Add (plus) button, select the interface, enter a name for the service and then select Create.
- If the Wi-Fi network you’re trying to connect to is created by an AirPort Time Capsule or AirPort base station, unplug the power cord to restart the device and plug it back in after a few minutes. If the network is available again, try connecting to it.
- Update macOS. Select Menu > System Preferences > Software Update to check for and install available updates.
- When your Mac tries to connect to Wi-Fi, it checks and detects any issues that may affect its ability to create a stable, fast and secure connection. Check Wi-Fi Recommendations in the Wi-Fi status menu for any recommended solutions.
- Forget the network and try connecting to it again. Select System Preferences > Network > Wi-Fi > Advanced. Select the network, press the (-) button and select OK.
- Change your Wi-Fi channel. Also, while in your router settings, make sure you don’t have MAC address filtering or other restrictive security features enabled.
- Reset the SMC, PRAM or NVRAM on your Mac.
- If the problem is the router, you can try and boost the signal strength or replace it with a new one.
- Contact your network administrator or ISP to make sure there is no issue on their end.
- Use a personal hotspot to connect to Wi-Fi. Depending on your mobile carrier, you can share your phone’s cellular data connection with your Mac and access the web. If you can connect via the hotspot, the issue is most likely with your router or ISP, not your Mac.
- If the issue is with your router, and you’re unable to fix it, you can replace it with a new router.
Use Apple Wireless Diagnostics
Wireless Diagnostics is a little-known utility that ships with your Mac and helps you analyze and diagnose your Wi-Fi connection. The utility helps analyze your connection especially when you can connect to your router but can’t stream video or music, load pages, or receive emails.
To open Wireless Diagnostics:
- Close any open apps and try to connect to your Wi-Fi.
- Press and hold the Option key, select the Wi-Fi icon and then select Open Wireless Diagnostics from the menu.
- Type your Mac user credentials (name and password) if prompted and the utility will begin analyzing your wireless environment.
- Wireless diagnostics will ask for more information about any other router or your base station, which it will include in the diagnostics file it saves to your Mac. Once the analysis is complete, you’ll receive a compressed file that lists the issues the utility detects along with possible solutions and best practices for your Wi-Fi connectivity.
- The diagnostics file is saved in the /var/tmp folder, which you can open from Finder in the Dock. Select Finder > Go > Go to Folder, type /var/tmp as the folder name and then select Go to open the folder containing the diagnostics file. Look for a file that starts with WirelessDiagnostics and ends with .tar.gz.
Note: To see the details of the items on the diagnostics report, select the info button next to each item. Make sure to back up or note down your router or network settings before changing them based on the diagnostics recommendations just in case you’ll need to use the settings later on.
Renew DHCP Lease
The DHCP (Dynamic Host Configuration Protocol) gives out IP addresses to devices on your network so that they can communicate. These include your Mac, router, phone and any other devices connected on your network.
If the DHCP Lease has issues, it could explain why your Mac won’t connect to Wi-Fi. Renewing the lease may resolve the problem.
- Select Menu > System Preferences > Network.
- Select Wi-Fi > Advanced.
- Select Renew DHCP Lease under the TCP/IP tab.
Start Your Mac in Safe Mode
Safe Mode is one of the startup options in your Mac that can help you figure out whether an issue is caused by software or apps that load as your Mac boots up. Safe Mode prevents software from launching during your Mac’s booting process, including login items, third-party fonts and non-essential system extensions.
You can boot your Mac into Safe Mode and check whether the Wi-Fi connectivity issue still happens.
- Restart your Mac and down press the Shift key immediately as your Mac boots up.
- When the login screen appears, release the Shift key and log in to macOS.
- If asked to log in again, enter your login details, and you’ll see the words “Safe Boot” in the top right corner of the window.
Note: If the issue doesn’t occur in Safe Mode, it’s probably been solved so you can restart your computer normally and test whether you can connect to Wi-Fi again. However, if you’re still having Wi-Fi connection issues in Safe Mode, reinstall macOS and update Apple software and third-party apps.
Run Apple Diagnostics
Mac still won’t connect to Wi-Fi? Run Apple Diagnostics to check for network or Wi-Fi issues.
- Unplug all peripherals connected to your Mac and shut down the computer.
- Power on your Mac while pressing and holding down the D key.
- If you get a screen asking you to select a language, pick the language and then wait a few minutes.
Image: 08-mac-wont-connect-to-Wi-Fi-troubleshooting-tips-select-language-screen
If there’s a problem, Apple Diagnostics will suggest possible solutions.
Fix Wi-Fi Issues on Mac
With the tips and fixes in this guide, you should be able to troubleshoot the problem and get connected again. However, if none of these steps helped, make a Genius Bar appointment to get your Mac fixed.
We have more guides on what to do when you can connect to your router but can’t access the internet and how to get Wi-Fi without an internet provider.
Leave a comment and let us know which tips or solutions worked for you.
