Operations

How to Set Up DHCP Audit Logging on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up DHCP Audit Logging on Windows Server 2019

Introduction to DHCP Audit Logging on Windows Server 2019 DHCP Audit Logging records every IP address assignment, renewal, release, and denial made by the DHCP server. This log is invaluable for network troubleshooting (tracking which machine had a given IP at a specific time), security investigation (identifying rogue devices or tracking when an infected machine […]

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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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