Software troubleshooting desk

Practical fixes for tool errors, setup blocks, and workflow issues.

Symptom

Cause

Fix route

Verify

Fresh repair notes

All notes

Fix PuTTY Connection Refused: Check SSH Service

When you see 'Connection refused' in PuTTY, it usually means the SSH server on the remote machine...

Fix Remote Desktop DNS Error Permission Denied

When connecting to a remote desktop, you might see an error like DNS error – permission den...

Windows Activation Key Not Recognized on Ubuntu Dual Boot
If you installed Ubuntu alongside Windows and now your Windows activation key is not recognized, ...

Fix PowerShell 502 Bad Gateway in IIS: Step-by-Step
A 502 Bad Gateway error in IIS typically means a downstream server or application pool failed. Wh...

Fix Windows Defender Service Not Running
If you see "Windows Defender service not running" or a red warning in Security Center, the underl...

Fix Windows Defender Connection Refused via Group Policy
If you see a "connection refused" error when trying to open Windows Defender Security Center or r...


    Issue queue
Sitemap
Fix Chrome Offline Installer Permission Denied Errors
Troubleshooting Chrome 'Permission Denied' Log Errors
How to Fix OneDrive Sync Pending Errors
Windows 11 OneDrive Authentication Failed Troubleshooting
Troubleshoot Error 0x4 in Remote Desktop
Fix BitLocker Blank Screen After BIOS Update
How to Diagnose BitLocker Failures with Event Logs
Fix 'Windows Update Service Not Running Permission Denied'
How to Repair Chrome Profile Path Missing Error
Teams Port Already in Use After Update – Fix
SSH Timeout After Login: Causes and Fixes
Resolve Windows Search Permission Denied
Desk note

    Troubleshooting paths
Home
Windows FixesmacOS HelpBrowser IssuesOffice ToolsDeveloper ToolsCloud SoftwareSecurity ToolsBackup RecoveryNetwork ToolsDatabase ToolsAI ToolsProductivity AppsCLI ErrorsDocker KubernetesEmail ClientsFile Utilities