LAN zone can access Internet but applications like Outlook, Office365 not working when connected via WiFi
06/01/2021 
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DESCRIPTION:
WiFi is great because it gives freedom, and while Ethernet still dominates in delivering better speed compared to WiFi, there is nothing like sitting anywhere you wish and work or enjoy a movie. No wires! But then when you face issues, a wired connection sounds more reliable.
This article describes when the task bar shows "no Internet / limited Internet access" in the Network Connectivity Status Indicator (NCSI) on Windows which results in various applications like Outlook, Office 365, Cortana, and Spotify not working properly.
These Apps rely on Windows Internet status to make a connection and are unlikely to work when the status shows "no or limited Internet access".
Even though the ping to Internet resources or browsing websites on browsers is successful without issues.
To verify Internet connectivity on LAN zone:
- Go to Investigate | System Diagnostics
- Under Diagnostic Tool, select "Check Network Settings"
- Test all the servers in General Network Connection.
- If the test fails, check the respective ISP connection, DNS settings, Default Gateway.
- If the test succeeds, it means firewall can access Internet. Load the Office365 or Outlook application.
- Check the status on the task bar, if it shows a No Internet / Limited Internet connection symbol.
CAUSE:
Technically, Wi-Fi adapters are different from Ethernet Adapters, but when it comes to functionality, they are both network adapters. So unless its a problem with the hardware, troubleshooting both is more or less the same.
Despite those affected by the problem aren’t actually offline. It’s still possible to load up a browser and surf the web as normal, but Apps that rely on Windows 10’s Internet status to make a connection are unlikely to work. These include Cortana, Microsoft 365, OneDrive, the Microsoft Store, and Spotify.
RESOLUTION:
Even though the issue is still being looked into by Microsoft, the following workarounds can be tried and proven to be working in certain occasions:
- Update your network adapter drivers on the PC.
- If you have the latest network driver then try on it's Driver tab also to Roll Back, or Uninstall and then restart PC to reinstall the driver.
- Go to Device Manager | Network Adapters, select WiFi adapter, then Power Management tab, clear the check box to "Allow the computer to turn off the device to save energy." Then on the Advanced tab disable any energy-saving options.
- If this was caused by Windows Updates then you can check which were installed at Settings | Update & Security | Windows Update under Installed Updates, then Uninstall them.
- If this was caused by Version update then you can roll it back in Settings | Update & Security | Recovery and then hide it until it matures using the Hide Updates Tool.
- Go to Settings | Network & Internet | WiFi | Manage Known Networks, highlight and remove the network having problems, restart PC to see if it shows up again.
- Try powering off modem, router and PC and then restarting in that order with 1 minute in between each. You may need to reset your router or optimize it.
- Go to registry editor: HKEY_local_machine\system\currentcontrolset\services\nlasvc\parameters\Internet Open- enableactiveprobing. Change value data from 0 to 1. Click OK and restart.
CAUTION: The above steps are recommendations which should be performed after taking proper steps and backups and SonicWall can't respond if they are not working or causing any further issue.
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