How to Allow an App Through Windows Defender Firewall
If an app can't connect to the internet or network, Windows Defender Firewall may be blocking it....
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Remote Desktop Connection Refused Authentication Error
You try to connect to a remote computer via Remote Desktop (RDP) and get an error like "Connectio...
How to Fix Outlook Setup Error 'Cannot Start Microsoft Outlook'
You open Outlook and see: "Cannot start Microsoft Outlook. Cannot open the Outlook window."
How to Fix 502 Bad Gateway in Command Prompt
If you see a 502 Bad Gateway error while using command prompt—for instance when ...
Fix Windows Defender Service Authentication Failed Error
You might see the error 'Windows Defender service authentication failed' when trying to open Wind...
Windows Terminal Error 0x80070005: Fix Access Denied
If you see error code 0x80070005 when launching Windows Terminal, it usually means the app can't ...
Topic paths
Quick titles
Resolving PowerShell 404 ErrorsWindows Defender SSL Error After Update FixTroubleshoot Windows Update Service Stuck on StartingWindows Activation 502 Network Error Fix GuideBitLocker Error 0x80072f8f: DNS Fix GuideHow to Fix Remote Desktop Error Code 0x4How to Fix Windows Terminal Error 0x80070005Reset Microsoft Store Cache and Fix Port Conflicts