Troubleshooting

Ubuntu 20.04 — storebackup — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — storebackup — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 June 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4508-1 Related CVEs: CVE-2020-7040 Upstream summary: It was discovered that StoreBackup did not properly manage lock files. A local attacker could use this issue to cause a denial of service […]

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Common Problems 121195

Debian 10 Cron Job Not Running at Scheduled Time

🟡 Medium   ⏱ 5–30 min  Last verified: 29 June 2020 Affected versions: Debian 10 📖 ~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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Common Problems 118478

No space left on device in /var

🟡 Medium   ⏱ 5–30 min  Last verified: 29 June 2020 📖 ~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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Common Problems 112931

Windows Server 2016 — CBS Manifest Corruption Causes 0x80073701 Update Failure — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 June 2020 Affected versions: Windows Server 2016 📖 ~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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How to Set Up a PKI Infrastructure with AD CS on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Set Up a PKI Infrastructure with AD CS on Windows Server 2016

Introduction Active Directory Certificate Services (AD CS) on Windows Server 2016 provides a complete Public Key Infrastructure (PKI) platform for issuing and managing digital certificates used by SSL/TLS, smart card authentication, email signing, IPsec, code signing, and more. A two-tier PKI hierarchy — an offline Root CA and an online Issuing CA — is the […]

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How to Set Up Nginx as a Reverse Proxy on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Nginx as a Reverse Proxy on Debian 10

Introduction Deploying set up nginx as a reverse proxy on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. […]

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Ubuntu 14.04 — uwsgi — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — uwsgi — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 June 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5054-2 Related CVEs: CVE-2020-11984 Upstream summary: USN-5054-1 fixed a vulnerability in uWSGI for Ubuntu 18.04 LTS. This update provides the corresponding fixes for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. […]

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How to Set Up iSCSI Storage on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up iSCSI Storage on RHEL 7

How to Set Up iSCSI Storage on RHEL 7 iSCSI (Internet Small Computer System Interface) is a block-level network storage protocol that transports SCSI commands over TCP/IP networks. It is widely used in enterprise environments to provide shared block storage without the cost of dedicated Fibre Channel hardware. RHEL 7 ships with full iSCSI support […]

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Common Problems 121023

Debian 10: DNS resolution breaks after resolv.conf overwrite

🟠 High   ⏱ 5–30 min  Last verified: 28 June 2020 Affected versions: Debian 10 📖 ~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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Common Problems 117408

Ubuntu 20.04 LTS – dist-upgrade aborts with held broken packages

🟠 High   ⏱ 5–30 min  Last verified: 28 June 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]

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