Troubleshooting | Compile My Mind

OSI vs TCP/IP Model: What Is the Difference?

8/21/26

A support ticket says the network has a “Layer 3 problem.” A packet capture shows Ethernet, IP, TCP, TLS, and HTTP. Then someone opens a …

The OSI Model Explained Layer by Layer

8/15/26

A video call freezes, but ordinary websites still load. Is the Wi-Fi signal weak? Is a router dropping traffic? Is the application stuck, or …

networking protocols it-fundamentals troubleshooting

Troubleshoot GitHub Actions Cache Misses

7/21/26

A GitHub Actions cache “miss” is not one condition. It can mean: no entry has the requested key; a prefix restore succeeded, but the …

github-actions ci-cd caching troubleshooting

Troubleshoot Kubernetes DNS Resolution from Pods

7/21/26

“The pod cannot reach orders” describes at least four different failures: The pod generated a different DNS query than expected. Cluster DNS …

dns kubernetes coredns troubleshooting

Troubleshoot Docker Volume Mounts Safely

7/19/26

Direct answer A container that cannot see expected data may be using a different volume name, mount destination, daemon context, driver, …

docker troubleshooting storage

Troubleshoot Microsoft Entra Conditional Access with What If

7/18/26

Direct answer Conditional Access troubleshooting requires both a modeled policy evaluation and evidence from the real sign-in. The What If …

entra-id conditional-access identity troubleshooting

Troubleshoot Docker Container Health Checks

7/18/26

Direct answer An unhealthy Docker container can still have a running main process. Diagnosis should therefore keep process state, …

docker troubleshooting monitoring developer-it-tools

Troubleshoot Windows Time Synchronization with w32tm

7/18/26

Direct answer Windows time failures should be separated into the configured source, the source that is currently selected, peer …

windows-server troubleshooting networking system-administration

Diagnose Windows Service Failures with PowerShell

7/16/26

Diagnose Windows Service Failures with PowerShell: direct answer Windows service troubleshooting is safer when the current service state, …

powershell windows-server troubleshooting system-administration monitoring

Investigate Windows Firewall Traffic with PowerShell

7/16/26

Direct answer Windows Firewall troubleshooting should distinguish the active profile, the rule that may apply, and the port or protocol …

powershell windows-server firewall network-security troubleshooting

Troubleshoot Windows Scheduled Tasks with PowerShell

7/16/26

Direct answer A scheduled task failure is easiest to diagnose by separating the task definition, its current state, and the result of its …

powershell windows-server troubleshooting system-administration automation

Troubleshoot Microsoft Entra Sign-in Errors with Sign-in Diagnostics

7/15/26

Direct answer Microsoft Entra sign-in troubleshooting should begin with the affected sign-in record and its diagnostic details. This …

entra-id identity authentication conditional-access troubleshooting

Windows DNS Diagnostics with PowerShell: A Safe Troubleshooting Workflow

7/15/26

Direct answer Windows DNS failures should be separated into three questions: does the machine have the expected interface and resolver …

powershell dns troubleshooting networking

Common Kubernetes Probe Misconfigurations and Fixes

7/15/26

Direct answer Kubernetes probes fail when the check does not match the application’s startup time, listening address, endpoint, or …

kubernetes troubleshooting configuration-management developer-it-tools

Troubleshooting Windows Event Logs with PowerShell

7/15/26

This article guides system administrators on troubleshooting Windows Event Logs using PowerShell’s Get-WinEvent and the wevtutil …

powershell windows-server troubleshooting