Wi-Fi Keeps Dropping After the Tahoe Update: 6 Fixes That Actually Work

28 Jul 2026

Updating to macOS Tahoe should improve the security, reliability and capabilities of your Mac. Unfortunately, some users find that their Wi-Fi becomes unstable shortly after upgrading.

The Mac may connect normally and then disconnect a few minutes later. Video meetings may freeze, cloud files may stop synchronising and websites may report that there is no internet connection—even though other devices on the same network continue working.

This does not necessarily mean the Mac’s wireless hardware has failed. A major macOS update can expose an outdated VPN client, incompatible security software, stale network settings, an expired IP address or a problem with the wireless router.

Here are six practical fixes that can resolve persistent Wi-Fi problems after upgrading to macOS Tahoe.

Before You Start: Identify Where the Problem Is

A few quick tests can help determine whether the problem is with the Mac, the network or a particular application.

Check whether:

Other devices lose their connection at the same time.
The Mac works reliably on another Wi-Fi network.
The problem affects every user in the office.
Wi-Fi drops only when the VPN is connected.
The Mac stays connected but cannot access the internet.
The issue occurs in one part of the building.
Ethernet works while Wi-Fi remains unreliable.

Testing the Mac with another trusted network or a mobile hotspot is particularly useful.

If it works perfectly elsewhere, the problem is more likely to involve the office router, wireless access points, authentication settings or local interference. If it disconnects from every network, the Mac’s configuration or installed software becomes the more likely cause.

Fix 1: Install the Latest macOS Tahoe Update

The first step is to check whether Apple has already released a correction.

Open:

Apple menu > System Settings > General > Software Update

Install the latest approved version of macOS Tahoe, then restart the Mac.

Apple recommends updating macOS when a Mac cannot connect reliably over Wi-Fi. Subsequent Tahoe releases contain compatibility, reliability and security corrections, so remaining on the first version installed may leave a known problem unresolved.

This is particularly important for managed business networks. Apple documented a Tahoe 26.4.1 correction for certain M5 MacBook models that could not join 802.1X wireless networks when content-filter extensions were in use. This shows how a problem that appears to be caused by the router may actually require an operating-system update.

Before updating a company Mac:

Save all work.
Confirm that a current backup exists.
Connect the Mac to power.
Use a stable alternative connection if necessary.
Check that important business applications support the update.
Follow your organisation’s managed-update process.

Employees should not bypass an update restriction applied through Microsoft Intune, Jamf or another management platform. The restriction may exist because the IT team is testing compatibility with security software or specialist applications.

Fix 2: Forget the Wi-Fi Network and Renew the DHCP Lease

The Mac stores information about previously joined wireless networks. After a major update, that saved configuration may no longer behave correctly.

Forgetting and rejoining the network creates a fresh connection.

How to Forget the Network

Open System Settings.
Select Wi-Fi.
Scroll down and select Advanced.
Find the affected network.
Select the menu beside its name.
Choose Remove From List.
Confirm by selecting Forget.
Rejoin the network and enter its password.

Apple confirms that removing a known network causes the Mac to discard its saved connection information until the user joins it again manually.

Make sure you know the Wi-Fi password before removing the network. On an organisation using certificate-based authentication or a managed wireless profile, contact IT rather than removing the configuration yourself.

Renew the Mac’s IP Address

If the Mac reconnects but continues losing internet access, renew its DHCP lease:

Open System Settings.
Select Network.
Select Wi-Fi.
Choose Details beside the connected network.
Select TCP/IP.
Choose Renew DHCP Lease.
Select OK.

DHCP is the process through which the router assigns the Mac an IP address. Restarting the Mac normally renews this address automatically, but it can also be renewed manually. If the previous lease has expired or conflicts with another device, the router may issue a new address.

This fix is particularly useful when the Wi-Fi icon remains connected but websites, email and cloud applications suddenly stop working.

Fix 3: Restart the Mac and the Network Equipment

Restarting may sound too simple, but it clears temporary network states and forces the devices involved to establish new connections.

Restart the Mac normally:

Apple menu > Restart

Then restart the router, modem or managed wireless access point according to the manufacturer’s instructions.

For a typical small-business or home router:

Save any important online work.
Disconnect the router from power.
Wait for approximately one minute.
Reconnect it.
Allow it to start fully.
Rejoin the Wi-Fi network.
Test the connection.

Do not press a factory-reset button. A factory reset can remove broadband credentials, wireless names, passwords, firewall settings and other essential configuration.

Apple recommends restarting the Mac and router when investigating Wi-Fi problems. It also advises keeping router firmware current and using appropriate wireless settings.

Check Whether the Router Has Run Out of Addresses

A router can normally assign only a limited number of IP addresses. In a busy office containing laptops, phones, tablets, printers, meeting-room systems and guest devices, that pool can become exhausted.

Apple notes that when a router has no available IP addresses, new devices may be unable to communicate with the network or internet. Adjusting the DHCP range or lease time may help the router reclaim addresses that are no longer being used.

This change should be made by the network administrator. Employees should not alter office router settings without authorisation.

Fix 4: Check VPN, Firewall and Security Software

A Tahoe upgrade may change how macOS handles network extensions. An older VPN, web-filtering application, endpoint-security agent or firewall utility may then interfere with the connection.

Apple specifically advises checking software that monitors or interacts with network traffic when a Mac can join Wi-Fi but cannot reliably reach internet services.

Potentially relevant software includes:

Business VPN clients.
Endpoint detection and response tools.
Antivirus products.
DNS-filtering agents.
Web-security software.
Parental-control applications.
Third-party firewalls.
Data-loss-prevention software.
Zero Trust access clients.
Legacy network-monitoring tools.

Look for an updated Tahoe-compatible version from the software provider.

A useful diagnostic test is to check whether Wi-Fi remains stable when the VPN is disconnected. However, company security software should not be permanently disabled or removed without IT approval.

Removing protection simply to restore connectivity can expose company systems and data.

The correct approach is to:

Record which application appears to trigger the problem.
Confirm its installed version.
Check whether an update is available.
Review the provider’s Tahoe compatibility information.
Reinstall or reconfigure it if instructed.
Escalate the issue to the IT provider or software vendor.

If the Mac uses an 802.1X corporate wireless network, certificate, content filter or identity-based access platform, the IT team may need to review both the Mac and the network-side configuration.

Fix 5: Create a New Network Location

A new network location gives the Mac a fresh collection of network settings without immediately deleting the existing configuration.

Apple specifically recommends network locations as a way to reset network settings for troubleshooting while preserving the current settings so they can be restored if necessary.

How to Create a Test Location

Open System Settings.
Select Network.
Open the action menu.
Select Locations.
Choose Edit Locations.
Select the plus button.
Name the location something clear, such as Tahoe Wi-Fi Test.
Select Done.
Join the Wi-Fi network again.
Test the connection.

The exact options may vary slightly according to the installed Tahoe release and whether the Mac is centrally managed.

If the new location resolves the problem, the original network configuration may contain a stale or conflicting setting.

Do not delete the old location immediately. Keep it until the new one has been tested with:

Wi-Fi.
Ethernet.
VPN.
Printers.
File shares.
Microsoft 365.
Remote-access tools.
Specialist business applications.

A managed Mac may have network settings delivered through configuration profiles. If those profiles automatically recreate the issue, the IT administrator will need to modify the management policy rather than repeatedly changing local settings.

Fix 6: Run Wireless Diagnostics and Review the Router

If the problem continues, use the diagnostic tools built into macOS.

Open Wireless Diagnostics

Try to connect to the affected network.
Hold the Option key.
Select the Wi-Fi symbol in the menu bar.
Choose Open Wireless Diagnostics.
Follow the on-screen instructions.
Review the summary and information buttons.

Apple’s Wireless Diagnostics tool analyses the Mac’s wireless environment and presents findings that can help identify network, signal or configuration problems.

Also check whether Wi-Fi Recommendations appears when you select the Wi-Fi menu. When available, this means macOS has detected a condition for which it can provide guidance. Apple notes that Wi-Fi Recommendations may not be available on certain enterprise networks, including some WPA Enterprise configurations.

What to Look For

The results may point towards:

Weak wireless signal.
Channel congestion.
Interference.
Incorrect router security.
Competing networks.
Frequent roaming between access points.
DNS problems.
DHCP problems.
A failing wireless access point.

The report may be technical, so businesses should provide it to their IT support company or network administrator.

Review the Router Configuration

Apple publishes recommended router and wireless-access-point settings intended to improve security, performance and reliability across Apple devices. It advises keeping router firmware updated and reviewing configuration after significant changes.

Areas worth reviewing include:

Router firmware.
WPA security mode.
Wireless channel selection.
Channel width.
DHCP configuration.
Band steering.
Access-point roaming.
Hidden network names.
Duplicate DHCP servers.
MAC-address restrictions.
DNS configuration.
Guest-network isolation.

Do not change several settings simultaneously. Make one controlled change, record it and test the result. Otherwise, it becomes difficult to identify which change solved—or worsened—the problem.

A Special Note About Private Wi-Fi Addresses

Modern macOS versions can use a private Wi-Fi address for each network. This improves privacy by preventing the Mac from presenting the same hardware address everywhere.

In Tahoe, the setting can be reviewed through:

System Settings > Wi-Fi > Details beside the network > Private Wi-Fi Address

Depending on the network, the available choices can include Off, Fixed or Rotating.

Most users should leave this protection enabled.

However, a business network that identifies authorised devices using their hardware addresses may behave unexpectedly when a private address changes. The correct solution is normally to update the organisation’s network-access design—not to tell every employee to disable privacy protections.

Speak to the network administrator before changing this setting.

What If Wi-Fi Works but the Internet Still Drops?

The Wi-Fi symbol only confirms that the Mac has established a connection with the wireless network. It does not prove that the router can reach the internet.

When Wi-Fi remains connected but applications stop working, possible causes include:

An expired or conflicting IP address.
DNS failure.
Router or modem problems.
Internet-provider disruption.
VPN failure.
Security-filtering problems.
An overloaded wireless network.
A captive portal that requires another sign-in.
An outage affecting the cloud service being used.

Try opening several unrelated websites. If one service fails but others work, the issue may be with that service rather than the Wi-Fi connection.

Testing another Mac or device on the same network can also help isolate the fault.

Should You Delete Network Preference Files?

Some online guides recommend manually deleting hidden .plist files from system folders.

This should not be an early troubleshooting step.

The location and purpose of macOS network files can change between releases. Deleting the wrong files may remove working Ethernet, VPN, DNS or managed-network configuration and make the problem harder to diagnose.

Use Apple’s supported options first:

Restarting.
Updating macOS.
Forgetting and rejoining the network.
Renewing the DHCP lease.
Creating a new network location.
Running Wireless Diagnostics.

A business user should leave manual system-file changes to an experienced Mac administrator.

Should You Reinstall macOS Tahoe?

Reinstalling macOS is unlikely to be necessary when the problem affects only one wireless network.

Consider more advanced repair only when:

The Mac disconnects from every network.
Safe Mode does not change the behaviour.
No incompatible software can be identified.
Apple Diagnostics or system logs indicate a wider problem.
Wi-Fi services disappear entirely.
The problem continues after all supported network resets.
The Mac has other operating-system faults.

Before reinstalling, create and verify a complete backup. Confirm that FileVault recovery information, Microsoft 365 access, device-management enrolment and specialist software licences can be recovered.

When the Problem Is Probably the Office Wi-Fi

The issue is more likely to involve the network when:

Several employees experience drops.
Problems occur in one room or floor.
Connections fail during busy periods.
Wi-Fi works when employees stand near an access point.
Wired devices remain stable.
Guest Wi-Fi behaves differently from the corporate network.
Macs work correctly on other networks.
The network uses outdated access points or router firmware.

In this situation, repeatedly resetting individual Macs will not solve the underlying issue.

The business may need:

A wireless survey.
Better access-point placement.
Updated equipment.
Improved roaming configuration.
Additional capacity.
New cabling.
Separation of guest and business traffic.
Changes to channel planning.
Review of 802.1X or certificate-based authentication.

Reliable business Wi-Fi should be designed around the size, construction and working patterns of the premises.

A Quick Tahoe Wi-Fi Checklist

Work through these steps in order:

Confirm whether the problem affects one Mac or several devices.
Test the Mac on another trusted network.
Install the latest approved Tahoe update.
Restart the Mac.
Forget and rejoin the Wi-Fi network.
Renew the DHCP lease.
Restart the router or access point.
Update VPN and security software.
Create a new network location.
Run Wireless Diagnostics.
Review router firmware and configuration.
Contact IT before changing enterprise profiles or security controls.

How Hamilton Group Can Help

Wi-Fi problems after a macOS Tahoe update may be caused by the Mac, its security software, the wireless network or a combination of all three.

Hamilton Group can diagnose the issue without relying on repeated resets or unsupported fixes.

Our services can include:

macOS Tahoe troubleshooting.
Business Wi-Fi assessments.
Wireless Diagnostics analysis.
Access-point configuration.
Microsoft Intune management for Macs.
VPN and security-software troubleshooting.
802.1X and corporate Wi-Fi support.
Router and firewall reviews.
Wireless coverage surveys.
Mac and Microsoft 365 support.
Ongoing network monitoring.

Hamilton Group aims to make first contact on IT support requests within 15 minutes, helping employees receive an early response when unreliable Wi-Fi interrupts their work.

To discuss Mac or business Wi-Fi support, contact Hamilton Group on 0330 043 0069 or visit hgmssp.com.

Previous Next