Server Troubleshooting and Resolution

Server Troubleshooting And Resolution Guide

Network Traffic Issues

Symptoms

• Slow response times
• High latency
• Unexpected bandwidth usage

Troubleshooting Steps

1. Check network utilization: iftop -i <interface>
2. Analyze network connections: netstat -tuln
3. Monitor incoming/outgoing traffic: tcpdump -i <interface> -n

Resolution

• Optimize application code for network efficiency
• Implement caching mechanisms
• Consider load balancing or CDN solutions

Network Errors

Symptoms

• Connection timeouts
• DNS resolution failures
• SSL/TLS errors

Troubleshooting Steps

1. Check DNS resolution: nslookup <domain>
2. Test network connectivity: ping <host> traceroute <host>
3. Verify SSL/TLS configuration: openssl s_client -connect <host>:<port>

Resolution

• Update DNS settings
• Check firewall rules
• Renew or reconfigure SSL/TLS certificates

Disk I/O Issues

Symptoms

• High disk usage
• Slow read/write operations
• I/O wait time spikes

Troubleshooting Steps

1. Monitor disk I/O: iostat -x 1
2. Check disk usage: df -h du -sh /*
3. Identify processes causing high I/O: iotop

Resolution

• Optimize database queries
• Implement proper indexing
• Consider upgrading to SSDs or faster storage
• Adjust file system parameters (e.g., noatime mount option)

General Tips

• Always backup data before making significant changes
• Keep system and application logs for reference
• Regularly update and patch your systems
• Monitor server performance consistently to catch issues early