Checklists for software errors, setup, and tool workflows.

How to Fix Outlook Rate Limit Error in Office 365

Understanding the Error

You may see a message like "Too many requests" or "Server busy" ...

Fix 502 Bad Gateway in Remote Desktop Connection

When you see a 502 Bad Gateway error while trying to connect via Remote Desktop,...

Fix Error 0x80070643 When Windows Update Stuck

You click "Check for updates" and Windows Update hangs or fails with error 0x80070643. This usual...

Fix Putty Connection Refused on Port 22

You try to connect to a remote server with Putty on port 22, but you get 'Connection refused'. Th...

Fix Windows Update Error 0x80070002 – Cache Corruption

When Windows Update fails with error code 0x80070002, it often points to a corrupted download cac...

Fix 'Windows Security Cannot Connect to Microsoft Defender' Error

When you open Windows Security and see the message 'Windows Security cannot connect to Microsoft ...