BitLocker requires TPM (Trusted Platform Module) support and may fail on systems without it or with BIOS configuration issues.
Solutions:
- Check if TPM is enabled in BIOS/UEFI settings (restart and press F2/Del)
- Enable TPM in Security settings
- Update BIOS/UEFI to latest version from manufacturer
- If no TPM: Enable BitLocker without TPM via Group Policy Editor
# Check TPM status
tpm.msc
# Enable BitLocker without TPM (gpedit.msc)
Computer Config → Administrative Templates →
Windows Components → BitLocker Drive Encryption →
Operating System Drives →
"Require additional authentication at startup" → Enable
Enforcing strict password policies can lock you out if existing passwords don't meet requirements.
Solutions:
- Boot into Safe Mode (press F8/Shift+F8 during startup)
- Log in with administrator account
- Reset password using "net user" command
- Create a new admin account if needed
- Always test policies on non-admin account first!
# Safe Mode command prompt
net user [username] *
# Enter new password that meets requirements
# Create new admin account
net user newadmin /add
net localgroup administrators newadmin /add
Overly restrictive firewall rules can block necessary services like printers, file sharing, or applications.
Solutions:
- Identify blocked service in Event Viewer (Windows Logs → Security)
- Create specific allow rule for that service only
- Use application-based rules instead of port-based when possible
- Test rules on private network before applying to public
- Document all custom rules for future reference
# Windows Firewall: Add application rule
netsh advfirewall firewall add rule
name="App Name" dir=in action=allow
program="C:\path\to\app.exe"
# Linux: Allow specific port
sudo ufw allow from 192.168.1.0/24 to any port 445
Security audit logs can grow quickly and consume disk space, especially on busy systems.
Solutions:
- Set maximum log size (recommended: 100-200 MB)
- Enable "Overwrite events as needed" or "Archive when full"
- Filter out non-critical events (e.g., successful logons)
- Archive old logs to external storage monthly
- Use log management tools for large environments
# Windows: Configure log size
wevtutil sl Security /ms:104857600
# Linux: Rotate logs
sudo logrotate -f /etc/logrotate.conf
# Compress old logs
gzip /var/log/auth.log.1
Security updates and antivirus scans can temporarily slow down system performance.
Solutions:
- Schedule scans during low-usage times (night/weekends)
- Exclude trusted directories from real-time scanning
- Disable unnecessary startup programs
- Check Task Manager for resource-heavy processes
- Consider upgrading RAM if consistently slow
# Check running processes
tasklist /v
# Disable startup program
msconfig → Startup tab
# Linux: Check system resources
top
htop # if installed
Firewall rules and user permissions can prevent access to shared network resources.
Solutions:
- Enable "File and Printer Sharing" in firewall
- Check share permissions (both share and NTFS)
- Verify network discovery is enabled
- Ensure user has proper credentials
- Test with \\computername\share path directly
# Windows: Test network path
net use \\computername\share /user:username
# View current network shares
net share
# Enable network discovery
Control Panel → Network and Sharing Center →
Advanced sharing settings
Frequent UAC prompts can be annoying but reducing UAC level decreases security.
Solutions:
- Keep UAC enabled - it's an important security layer
- Run trusted applications as administrator permanently
- Create shortcuts with "Run as administrator" enabled
- Use Task Scheduler to run tasks with elevated privileges
- Don't disable UAC unless absolutely necessary
# Check UAC level
UserAccountControlSettings.exe
# Run application as admin (right-click)
Properties → Compatibility →
"Run this program as administrator"
Failed updates leave systems vulnerable to known exploits and security vulnerabilities.
Solutions:
- Run Windows Update Troubleshooter
- Clear Windows Update cache (SoftwareDistribution folder)
- Reset Windows Update components
- Check disk space (updates need 10-20 GB free)
- Manually download and install cumulative update
# Stop Windows Update service
net stop wuauserv
net stop bits
# Clear cache
ren C:\Windows\SoftwareDistribution SD.old
# Restart services
net start wuauserv
net start bits