CrashLoopBackOffKubernetesSeverity: critical
Pod stuck in CrashLoopBackOff
The container starts, exits, and is restarted with an exponential back-off. The status is a symptom; the container exit code tells you why.
· 6 min read
Error codes, explained. Fixes, in order.
Plain-text troubleshooting guides for Windows Server, SQL Server, Kubernetes, Oracle, AWS, and Entra ID. Every guide lists symptoms, root causes, and tested resolution steps.
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6 entries- 0x80070005Windows ServerSeverity: high
E_ACCESSDENIED during Windows Update or service install
The calling process lacks permission on a file, registry key, or COM object. Most often seen during cumulative updates and MSI installs.
· 4 min read
- Error 18456SQL ServerSeverity: high
Login failed for user — SQL Server authentication
A generic authentication failure. The State number in the error log identifies the actual cause; the client message is intentionally vague.
· 5 min read
- AADSTS50076Microsoft Entra IDSeverity: medium
MFA required due to Conditional Access policy
A token request was blocked because the user must complete multi-factor authentication. Common with legacy clients and non-interactive service flows.
· 3 min read
- ORA-12541Oracle DatabaseSeverity: critical
TNS: no listener
The client reached the host but nothing was listening on the target port. Either the listener is down or the client is pointing to the wrong address.
· 4 min read
- AccessDeniedAWS S3Severity: medium
S3 PutObject AccessDenied with a valid IAM policy
The identity policy allows s3:PutObject, but another layer — bucket policy, KMS key policy, or an SCP — denies it. Explicit denies always win.
· 5 min read
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