DNS

Common Problems 115472

NFS mount hangs at boot

🟡 Medium   ⏱ 5–30 min  Last verified: 10 November 2019 📖 ~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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How to Configure Initial Settings on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Initial Settings on Windows Server 2016

How to Configure Windows Server 2016 Initial Settings After installing Windows Server 2016, a series of initial configuration tasks should be completed before placing the server into production. These tasks include setting the hostname, configuring the time zone, assigning a static IP address, enabling Remote Desktop, configuring Windows Update, and joining an Active Directory domain […]

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How to Configure a Static IP Address with NetworkManager on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure a Static IP Address with NetworkManager on RHEL 7

How to Configure a Static IP Address with NetworkManager on RHEL 7 Configuring a static IP address is one of the most fundamental tasks for any Linux system administrator. On Red Hat Enterprise Linux 7, NetworkManager is the default network management daemon, and it provides two powerful tools for managing connections: the command-line interface nmcli […]

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How to Use tmux for Terminal Multiplexing on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Use tmux for Terminal Multiplexing on RHEL 7

How to Use tmux for Terminal Multiplexing on RHEL 7 Every Linux administrator has experienced the frustration of losing a long-running process because an SSH connection dropped. tmux (terminal multiplexer) solves this problem by running your terminal sessions inside a persistent server process that survives disconnections. Beyond persistence, tmux allows you to split a single […]

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Common Problems 114916

RHEL 8 firewalld Zone Mismatch Blocks Application Port

🟡 Medium   ⏱ 5–30 min  Last verified: 9 November 2019 📖 ~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 113591

Windows Server 2012 R2 — Cluster Service (ClusSvc) quorum startup failure — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 November 2019 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Common Problems 112571

Windows Server 2019 – Storage Replica asynchronous RPO spikes during backup windows – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 9 November 2019 Affected versions: Windows Server 2019 📖 ~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 Install Certbot and Automate Let's Encrypt Renewals on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Certbot and Automate Let’s Encrypt Renewals on RHEL 7

How to Install Certbot and Automate Let’s Encrypt Renewals on RHEL 7 Securing your web server with a trusted TLS certificate is no longer optional — it is a baseline requirement for any production site. Let’s Encrypt provides free, automated, and domain-validated certificates, and Certbot is the official command-line client that manages the entire lifecycle: […]

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SLES 15 — rpcbind — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — rpcbind — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 9 November 2019 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2017:1306-1 (see also SUSE bugzilla) Related CVEs: CVE-2017-8779 CVE-2015-7236 Upstream summary: rpcbind through 0.2.4, LIBTIRPC through 1.0.1 and 1.0.2-rc through 1.0.2-rc3, and NTIRPC through 1.4.3 do not consider the maximum RPC data […]

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How to Configure Failover Clustering on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Failover Clustering on Windows Server 2012 R2 (2012-R2-2)

How to Configure Failover Clustering on Windows Server 2012 R2 Failover Clustering is a high-availability feature in Windows Server 2012 R2 that allows multiple servers (nodes) to work together to keep services and applications running if one or more nodes fail. When a clustered node becomes unavailable due to hardware failure, software crash, or planned […]

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