Why Your iMac Won't Share Wi-Fi: All the Reasons and How to Fix It

• Network Name (SSID): in Latin, without spaces and special characters (for example, iMac_Hotspot).
• Channel: select Auto or specify manually 6 (less congested in urban areas).
• Safety: only WPA2/WPA3 Personal (other options are unsafe or don't work on new devices).
• Password: minimum 8 characters, with numbers and letters.
• Check the box to the left of Internet Sharing and press "Launch" (Start).

If Wi-Fi does not appear after these steps, check:

• 🔍 Indicator in the menu bar: The "Shared" icon (two arrows forming a circle) should appear in the upper right corner. If it doesn't appear, the setting hasn't been applied.
• 📡 List of networks on other devices: refresh the wifi list on iPhone/Android — sometimes the network appears with a delay of up to 30 seconds.

The iMac's connection to the Internet (cable/USB modem) has been checked |

Updated macOS to the latest version|

The correct internet source is selected in "Shared Access"|

The network name (SSID) is specified without Cyrillic and special characters|

The password specified is ≥8 characters long-->

3. Common macOS Settings Mistakes

Even if you did everything “according to the instructions”, iMac may not distribute Wi-Fi due to hidden errors in macOSHere are the most common ones:

sudo ifconfig bridge0 down

Please pay special attention to VPN conflictsIf you have installed NordVPN, ProtonVPN If your VPN client is not connected to your network, they may be blocking internet access. Try temporarily disabling the VPN and restarting Internet Sharing.

4. Hardware limitations: when the hardware is to blame

It's not always a software issue. Sometimes iMac does not distribute Wi-Fi because hardware limitations or malfunctions. Here's what to check:

• 🖧 Wi-Fi adapter: on the old ones iMac (2011–2014) adapter Broadcom BCM43xx may not support the mode SoftAP (access point). Check the adapter model via About This Mac → System Report → Network → Wi-Fi.
• 🔌 Ethernet port: If you are connecting via cable, make sure the port is working. iMac 2020+ may require an adapter USB-C → Ethernet (original from Apple or certified Belkin).
• ⚡ Nutrition: when distributing Wi-Fi iMac consumes more power. If you have a model with an external power supply (for example, iMac 27" 2017), make sure the cable is not damaged.

If you suspect a faulty adapter, follow these steps: diagnostics:

1. Open Terminal and enter:

   networksetup -listallhardwareports

   In the output, find the section Wi-Fi and check the status Device: en0 (or en1). If there is no status or it is written Hardware Port: Wi-Fi, Device: (null) — the adapter is not recognized by the system.

2. Reboot iMac with the key held down Shift (Safe Mode). If Wi-Fi works, the problem is with boot extensions (kexts).

5. Conflicts with the router or provider

Sometimes the problem isn't in the iMac, and in router settings or provider restrictions. For example:

• 📶 Double NAT: if your iMac If you're connected to a router that distributes Wi-Fi, a subnet conflict may occur. The solution is to disable DHCP on the router or switch it to iMac in mode bridge (bridge mode).
• 🔒 Provider blocking: some operators (for example, Beeline or MTS) block internet access from USB modems. Check your plan terms or call support.
• 🔄 MAC filtering: if MAC address binding is enabled in the router, iMac won't be able to distribute the Internet to unregistered devices. Disable filtering in the router settings (section Wireless → MAC Filter).

To check if your provider is blocking seeding:

1. Connect iMac to the Internet via Ethernet.
2. Launch "Sharing" and try sharing Wi-Fi.
3. If the Internet on the connected devices does not work, but iMac He has access himself - the problem is in the settings macOS or router. If there is no internet and iMac — call your provider.

6. Resetting network settings: a last resort

If nothing helps, there remains complete reset of network settingsThis will delete all saved networks, VPN configurations, and Sharing settings, but often solves the problem. Attention: After the reset, you will have to re-enter your Wi-Fi passwords!

Method 1: Through Terminal (system safe):

sudo networksetup -removeallpreferredwirelessnetworks en0
sudo networksetup -setdhcp Wi-Fi
sudo networksetup -renewdhcp Wi-Fi
sudo ifconfig en0 down && sudo ifconfig en0 up

Method 2: Through Wireless Diagnostics utility (built in macOS):

1. Clamp Option (Alt) and click on the Wi-Fi icon in the menu bar.
2. Select Open Wi-Fi diagnostics (Open Wireless Diagnostics).
3. In the utility menu, select Reset (Reset) → Reset network settings.

After reset, reboot iMac and repeat the "Sharing" setup from scratch.

sudo softwareupdate --install --all

7. Alternative ways to share the Internet from an iMac

If the standard "Sharing" doesn't work, try workarounds:

• 🔗 Through Ethernet: If you have a second router, connect it to iMac via cable (to the port WAN/Internet) and distribute Wi-Fi through it. Configure the router to mode repeater or access points.
• 📱 Via iPhone: turn on iPhone "Modem mode" (Settings → Tethering) and connect iMac to his Wi-Fi. Then share the internet with iMac to other devices (but this will create double NAT).
• 🖥️ Virtual router: install the program Connectify Hotspot (there is a version for macOS) or WiFi ExplorerThey allow you to distribute Wi-Fi even if the standard "Sharing" option doesn't work.

For advanced users there is a way with setting pfctl (firewall):

sudo pfctl -e
sudo pfctl -F all
echo "nat on en0 from en1:network to any -> (en0)" | sudo pfctl -ef -

This command redirects traffic from Wi-Fi (en1) to Ethernet (en0). Attention: Incorrect firewall rules can block internet access!

FAQ: Answers to Frequently Asked Questions