Useful Tools and Links
From Server Knowledge Base
				DNS
Monitoring
- Nagios - You generally need another server to monitor your target server to use this.
 - Cacti for Networking
 
Network
- Network-Tools.com (great for checking propagation externally)
 - Extra Network tools
 - Ping Plotter
 - Port Scanner
 
Performance
Security
- Website Security Check 1
 - Website Security Check 2
 - General Webserver Check
 - Linux Malware Detect
 - Password Strength Test
 - Port Scan
 - Security Tools
 - Strong Password Generator
 
SSL
- SSLLabs SSL Checker
 - Check if Certicate and Private Key match
 - SSL-Checker
 - SSL Certificate Decoder
 - PKCS to PEM converter
 - SSL Converter