Network Troubleshooting Sequence
Step-by-Step Network Diagnosis:
1. Basic Connectivity
ping 127.0.0.1 # Loopback test
ping [local_ip_address] # Local network test
ping [router_ip] # Gateway test
ping 8.8.8.8 # Internet test
ping google.com # DNS test
2. IP Configuration
ipconfig /all # Check IP settings
ipconfig /release && ipconfig /renew # Refresh IP
3. DNS Resolution
nslookup google.com # DNS test
ipconfig /flushdns # Clear DNS cache
4. Network Stack Reset
netsh int ip reset
netsh winsock reset
RESTART THE COMPUTER REQUIRED!
5. Port & Service Check
netstat -an | findstr :80 # Check specific port
telnet [server] [port] # Test port connectivity