Fixing Network Issues in Synology NAS Systems

Synology

Network issues in a Synology NAS can disrupt file access, backups, and business operations. Whether you are experiencing slow speeds, dropped connections, or remote access failures, identifying the root cause is key to restoring stability.

This guide covers common network problems and how to fix them effectively.

Common Symptoms of Network Issues

Before troubleshooting, identify the problem:

NAS not reachable on the network
Slow file transfers
Intermittent disconnections
Remote access not working
High latency or timeouts

Understanding the symptoms helps narrow down the cause.

Check Basic Network Connectivity

Start with the fundamentals:

Ensure Ethernet cables are properly connected
Verify link lights on the NAS and switch
Confirm the NAS has a valid IP address
Ping the NAS from another device

If the NAS is not reachable locally, the issue is likely hardware or configuration related.

Verify IP Address and Network Configuration

Incorrect network settings are a common cause of issues.

Use a static IP address for the NAS
Confirm subnet mask and gateway settings
Avoid IP conflicts with other devices
Check DNS configuration

Proper IP configuration ensures consistent connectivity.

Diagnose Switch and Router Issues

Network hardware can impact performance and stability.

Restart switches and routers
Check for faulty ports
Verify VLAN configuration if used
Ensure firmware is up to date

Misconfigured or failing network devices can cause intermittent problems.

Fix Slow Network Speeds

If performance is poor:

Check network speed (1GbE vs 10GbE)
Verify cable quality (Cat5e, Cat6, etc.)
Enable link aggregation if supported
Check for network congestion

Also ensure the NAS is not overloaded with other tasks.

Troubleshoot Remote Access Problems

Remote access issues often involve network configuration.

Verify port forwarding settings
Check firewall rules
Use VPN instead of direct access
Confirm dynamic DNS configuration

Incorrect NAT or firewall settings can block external connections.

Review Firewall and Security Settings

Security settings can sometimes block legitimate traffic.

Check Synology firewall rules
Ensure required ports are open internally
Review auto-block settings
Temporarily disable firewall for testing (if safe)

Always re-enable security features after testing.

Check DSM and Package Updates

Outdated software can cause compatibility issues.

Update DSM to the latest version
Update network-related packages
Restart services after updates

Keeping systems updated ensures stability and security.

Monitor System and Network Load

High resource usage can affect network performance.

Check CPU and RAM usage
Monitor active connections
Review background tasks (backups, indexing)

Reducing system load can improve network responsiveness.

Advanced Troubleshooting

For persistent issues:

Use network diagnostic tools (ping, traceroute)
Analyse logs for errors
Test with a different network interface
Replace cables or hardware if needed

These steps help isolate complex problems.

Preventing Future Network Issues

To maintain a stable environment:

Use high-quality networking hardware
Implement proper network segmentation
Monitor performance regularly
Document configurations

Proactive management reduces the likelihood of recurring issues.

How Epis Technology Resolves Network Issues

Epis Technology helps businesses diagnose and resolve Synology NAS network issues quickly and effectively. By analysing infrastructure, configuration, and performance, Epis Technology ensures reliable connectivity and optimized system performance.

The company provides services including large storage solutions, Microsoft 365 and Google Workspace backups, fully managed PC backups, and Synology consulting and support. Epis Technology also assists with network design, optimization, and troubleshooting.

About Epis Technology

Epis Technology provides enterprise IT infrastructure, Synology consulting, and data protection solutions for organizations of all sizes. The company specializes in Microsoft 365 and Google Workspace backup solutions, large-scale storage systems, fully managed PC backups, and Synology deployment and support. Through expert design, implementation, and optimization, Epis Technology helps businesses secure, manage, and recover their critical data while ensuring performance, scalability, and cybersecurity resilience.