Proxy

pr cp 119023 r2

Ubuntu 14.04 LTS SSL certificate verify failed in package tools

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 117484 r2

Ubuntu 20.04 LTS Failed to Fetch Packages from Mirror

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 117983 r2

Ubuntu 18.04 LTS Apache fails to start due to port 80 conflict

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 115978 r2

snapd downloads stall behind corporate proxy

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: Ubuntu 26.04 LTS ๐Ÿ“– ~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 118457 r2

Ubuntu 16.04 LTS apt reports Hash Sum mismatch

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 116439 r2

Ubuntu 24.04 LTS UFW Blocks Docker Published Ports

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 124193 r2

Oracle Linux 10 – Common Problem 030 – Diagnosis and Fix

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: Oracle Linux 10 ๐Ÿ“– ~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 113932 r2

SELinux blocks NGINX upstream proxy connections

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: RHEL 10.0 RHEL 10.1 ๐Ÿ“– ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary NGINX returns 502 because SELinux denies outbound proxy connection. Symptoms audit logs […]

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pr cp 117913 r2

Ubuntu 18.04 LTS DNS resolution fails intermittently with systemd-resolved

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 118407 r2

Ubuntu 16.04 LTS intermittent DNS failures with resolvconf

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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