Fix Corrupted Windows System Files with SFC and DISM
How to repair Windows 10 and 11 with DISM and SFC: the correct order, what the results mean, offline repair and last-resort options.
yuri@itblogs: ~
$ cat README.md # Personal IT knowledge base Fixes, snippets and notes from real-world work: Linux, networking, servers, DevOps. $ ls posts/ | wc -l 24$
Cron Jobs Explained: crontab Syntax, Examples and Troubleshooting
Schedule jobs with cron: syntax, examples, environment and PATH problems, the percent sign trap, flock, logging and systemd timer alternatives.
Windows "No Internet": Reset the Network Stack (ipconfig, netsh)
Fix Windows no-internet and DNS problems: find the broken layer, flush DNS, reset Winsock and TCP/IP, check proxy and drivers.
Why Did Windows Restart or Crash? Event Viewer and PowerShell Guide
Find out why a Windows PC rebooted or blue-screened with Reliability Monitor, Event IDs 41, 1074 and 6008, PowerShell and crash dumps.
Windows Remote Desktop (RDP) Not Working? Fixes and Security Tips
Fix RDP connection problems: Home edition limits, firewall and network profile, user permissions, credentials errors, plus how to use RDP safely.
Subnetting and CIDR Explained with Simple Examples
Learn subnetting fast: CIDR prefixes, masks, block-size trick, splitting networks, private ranges and tools to check your math.
DNS Troubleshooting Guide: dig, nslookup and Common Problems
Diagnose DNS issues with dig, nslookup and Resolve-DnsName: record types, status codes, TTL, flushing caches and the usual causes.
Diagnose Network Connectivity Step by Step: ping, mtr, nc, tcpdump
A layered method to find network problems: what refused and timed out really mean, mtr and traceroute, MTU tests and packet capture.
Set Up a WireGuard VPN Server on Ubuntu 24.04
Build a WireGuard VPN on Ubuntu 24.04: keys, server and client configs, NAT and firewall rules, full or split tunnel, and troubleshooting.