Debian 9

pr cp 121658 r2

Docker Containers Cannot Reach Internet

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121648 r2

Sudo Fails Due to Incorrect /etc/sudoers Permissions

πŸ”΄ Critical   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121638 r2

Postfix Queue Backlog Causing Delayed Email Delivery

🟑 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121628 r2

Ext4 Filesystem Remounted Read-Only After I/O Errors

πŸ”΄ Critical   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121618 r2

Package Install Held Back by Broken Dependencies

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121608 r2

Swap Not Activating After Reboot

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121598 r2

Apache Returns 503 Because PHP-FPM Socket Missing

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121588 r2

Fail2ban Blocking Trusted Internal Addresses

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121578 r2

OOM Killer Terminating Critical Application Processes

πŸ”΄ Critical   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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pr cp 121568 r2

Firewall Rules Blocking Internal Application Traffic

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 πŸ“– ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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