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 πŸš€ L2 Server Management – Advanced Troubleshooting Guide (Part 2) πŸš€

Here’s Part 2 of the ultimate L2 server troubleshooting guide! If you missed Part 1, go back and check it for critical troubleshooting steps on disk space issues, RDP failures, and Active Directory problems.

Now, let’s dive into more advanced issues and real-world solutions every L2 Engineer must know!

πŸ”Ή Advanced L2 Server Issues & Fixes

1️⃣ DNS Resolution Failing – Websites & Internal Apps Not Loading 🌍

✅ Clear local DNS cache:

ipconfig /flushdns

✅ Check DNS forwarding settings:

Get-DnsServerForwarder

✅ If Active Directory DNS is failing, check:

repadmin /syncall

2️⃣ Hyper-V / VMware VM Boot Failures πŸ’½

✅ If a VM fails to start, check event logs for VMMS (Hyper-V Virtual Machine Management Service) errors.

✅ Fix corrupt VM configurations:

Get-VM | Where-Object {$_.State -eq "Off"} | Start-VM

✅ In VMware, check if the VM is locked due to file corruption or snapshot issues.

3️⃣ Windows Defender ATP Blocking Services πŸ”₯

✅ Check Defender logs:

Get-MpThreatDetection

✅ Exclude necessary services from ATP blocking:

Set-MpPreference -ExclusionPath "C:\Program Files\MyApp"

4️⃣ Kerberos Authentication Failures – Users Cannot Log In πŸ”‘

✅ Check Kerberos tickets:

klist 

✅ If tickets are expired, refresh:

klist purge 

✅ Verify time synchronization between servers using:

w32tm /query /status


Windows Basic Troubleshooting with CMD Commands

As IT professionals, we often rely on Command Prompt (CMD) for quick and effective troubleshooting in Windows. Here are some essential CMD commands that can help diagnose and fix common issues:

1️⃣ Check Network Issues

πŸ”Ή ping google.com – Check internet connectivity

πŸ”Ή ipconfig /all – View IP details

πŸ”Ή ipconfig /flushdns – Clear DNS cache


2️⃣ Fix Connectivity Problems

πŸ”Ή netsh winsock reset – Reset network adapter

πŸ”Ή netsh int ip reset – Reset TCP/IP stack


3️⃣ Check and Repair System Files

πŸ”Ή sfc /scannow – Scan and repair corrupted system files

πŸ”Ή chkdsk /f – Fix disk errors


4️⃣ Monitor System Performance

πŸ”Ή tasklist – View running processes

πŸ”Ή taskkill /F /PID <PID> – Force close a process


5️⃣ Check Windows Startup Issues

πŸ”Ή msconfig – Open System Configuration

πŸ”Ή bcdedit /enum – Check boot configuration


CMD is a powerful tool that can save time and effort in troubleshooting. What are your go-to CMD commands for quick fixes? Share in the comments!

πŸš€ Top Windows Troubleshooting Commands Every System Admin Must Know!


πŸ”Ή Tired of clicking through menus to fix issues?

πŸ”Ή Want to troubleshoot like a pro in seconds?


Use these powerful CMD commands to diagnose and fix common Windows issues FAST!


πŸ“Œ System & Performance Issues


πŸ”Ή Check system uptime:


wmic os get lastbootuptime


πŸ”Ή View system logs for errors:


eventvwr.msc


πŸ”Ή Scan and repair system files:


sfc /scannow


πŸ”Ή Check for corrupted Windows files:


dism /online /cleanup-image /scanhealth


πŸ”Ή Fix Windows Update issues:


net stop wuauserv 

net stop bits 

net start wuauserv 

net start bits 


πŸ“Œ Network Troubleshooting


πŸ”Ή Check IP configuration:


ipconfig /all


πŸ”Ή Release and renew IP address:


ipconfig /release 

ipconfig /renew 


πŸ”Ή Test network latency:


ping 8.8.8.8 -t


πŸ”Ή Trace network route:


tracert google.com


πŸ”Ή List active network connections:


netstat -ano


πŸ”Ή Find which process is using a port:


netstat -ano | find "80"


πŸ“Œ Disk & Storage Issues


πŸ”Ή Check disk for errors:


chkdsk C: /f /r


πŸ”Ή Show detailed disk usage:


wmic logicaldisk get size,freespace,caption


πŸ”Ή Check disk performance:


winsat disk


πŸ”Ή List all partitions:


diskpart 

list disk 


πŸ“Œ User & Access Issues


πŸ”Ή Reset a local user password:


net user AdminUser NewPassword


πŸ”Ή Find locked-out users in Active Directory:


net user /domain | find "Lockout"


πŸ”Ή Force logout a user session remotely:


logoff /server:RemotePCName


πŸ”Ή List all user sessions on a server:


qwinsta


πŸ“Œ Remote Management & Services


πŸ”Ή Check running services:


sc query state= all


πŸ”Ή Restart a service:


net stop spooler && net start spooler


πŸ”Ή Enable RDP remotely:


reg add "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f


πŸ”Ή Reboot a remote PC:


shutdown /r /m \\RemotePCName /t 0


πŸ’‘ Why Use These Commands?


✅ Fix issues faster – No need to dig through GUI menus

✅ Improve efficiency – Get things done in seconds

✅ Be a pro – Handle any system issue with confidence


πŸ”Ή Which command do you use the most? Comment below!

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