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MasterTroubleshooting
Receive intentionally broken systems and diagnose, fix, and restore them. Build real-world troubleshooting expertise.
1
Identify
2
Analyze
3
Diagnose
4
Fix
5
Validate
Showing 18 troubleshooting scenarios
Featured Scenario
highInternet Not Working
Ubuntu 22.0425 minBeginner
Symptoms:
Cannot access websitesDNS resolution failingIP connectivity works
Start TroubleshootingInteractive Demo
Broken SSH Access
Ubuntu Server 22.0420 minBeginner
Symptoms:
Cannot connect via SSHConnection refused error
Completed
Incorrect File Permissions
CentOS 8 Server15 minBeginner
Symptoms:
Web server 403 errorsCannot read configuration files
Completed
Failed Systemd Service
Debian Server25 minIntermediate
Symptoms:
Service not startingExit code errors in logs
Full Disk Space
Ubuntu Server20 minBeginner
Symptoms:
Write operations failingLog rotation stopped
Active Directory Login Failure
Windows Server 202230 minIntermediate
Symptoms:
Users cannot log inDomain controller unreachable
DNS Resolution Issues
Windows Server 201925 minIntermediate
Symptoms:
Name resolution failingClients cannot find domain
Completed
Group Policy Not Applying
Domain Controller20 minAdvanced
Symptoms:
GPO changes not reflectingRSoP shows old settings
DNS Server Outage
BIND DNS Server20 minIntermediate
Symptoms:
All DNS queries failingWebsites unreachable by name
Firewall Blocking Web Traffic
pfSense Firewall25 minIntermediate
Symptoms:
Port 80/443 blockedNew rules not working
VLAN Misconfiguration
Cisco Switch30 minAdvanced
Symptoms:
Inter-VLAN routing brokenTrunk ports not passing traffic
Packet Loss Investigation
Network Segment35 minAdvanced
Symptoms:
High latencyIntermittent connectivity
Malware Infection Simulation
Windows Workstation45 minAdvanced
Symptoms:
Suspicious processes runningNetwork connections to unknown IPs
Unauthorized Access Detected
Web Server40 minAdvanced
Symptoms:
Unknown SSH sessionsModified files detected
SSL Certificate Expired
Nginx Web Server20 minBeginner
Symptoms:
Browser security warningsHTTPS not working
Completed
Cloud App Deployment Failed
Container Cluster30 minIntermediate
Symptoms:
Pods in CrashLoopBackOffImage pull failures
IAM Permission Denied
Cloud Console20 minBeginner
Symptoms:
Access denied errorsCannot create resources
Load Balancer Health Check Failing
Cloud Load Balancer25 minIntermediate
Symptoms:
Targets marked unhealthyTraffic not routing