Repair Difficulty : Medium
For Microsoft Windows 7 and later
1) Click Start Button and type “Control Panel” in search box and Click on it.
2) In Control Panel Window, Open “Windows Firewall”.
3) Tap On “Turn Windows Firewall on or off”
Warning: If you are logged in as Guest user you will be asked to enter Admin Password
4) Click “Turn off Windows Firewall (not recommended)” under each network location and then Click “OK”
Warning: You can activate Microsoft Windows Firewall after Office 365 repair is complete.
2. Enter the command “inetcpl.cpl” and click OK.
3. Click on the “Security” tab.
4. Click “Reset all zones to default level” button at the bottom of the window.
5. Click OK button.
In most case 800f0203 error code in Office 365 should be resolved by now, if however the problem still persists please get your system checked by an expert.
If you are not able to resolve the issue following above steps, you can contact our 24×7 Chat Support for help.
Posted In: Office 365