VPN Logs on Synology: Location & Usage Guide
VPN Logs, Where They Are & How to Use Them
If you’re running a VPN on your Synology NAS, logging is just as important as encryption. VPN logs help you troubleshoot connection issues, investigate suspicious activity, and prepare for audits. Yet many administrators are unsure where these logs are stored or how to interpret them.
In 2026, with increased remote access and tighter compliance requirements, understanding VPN logs is essential for maintaining visibility and security.
Why VPN Logs Matter
VPN logs provide critical information such as:
Successful and failed login attempts
Source IP addresses
Connection start and end times
Authentication errors
Session duration
Without logs, diagnosing problems or investigating potential breaches becomes guesswork.
Where VPN Logs Are Stored in Synology DSM
On Synology NAS systems running DSM 7:
Log Center (Primary Location)
Most VPN activity is recorded in Log Center.
To access:
Log in to DSM
Open Log Center
Filter by VPN Server
You will see entries for:
OpenVPN connections
L2TP/IPSec login attempts
Failed authentication events
This is the easiest and safest place to review logs.
VPN Server Package Logs
Some detailed logs can also be found inside the VPN Server package itself.
To access:
Open VPN Server
Navigate to the Log section
Enable detailed logging if needed
If verbose logging is disabled, you may only see minimal session data.
SSH-Level Log Access (Advanced)
For deeper troubleshooting, advanced users can access system logs via SSH.
Common locations include:
/var/log/
How to Enable Detailed VPN Logging
If logs seem incomplete:
Open VPN Server
Enable detailed logging
Restart the VPN service if required
Make sure Log Center retention settings are configured so logs are not automatically deleted too quickly.
How to Use VPN Logs for Troubleshooting
Here are practical use cases:
1. Diagnosing Login Failures
Look for:
Incorrect credentials
Expired certificates
Blocked IP addresses
Port connectivity errors
Repeated failed attempts from one IP may indicate brute-force activity.
2. Identifying Suspicious Activity
Watch for:
Login attempts outside business hours
Foreign IP addresses
Rapid repeated authentication failures
Multiple users connecting from the same external IP
These patterns can signal compromised credentials.
3. Verifying Session Stability
If users report VPN drops:
Check session start and end times
Identify disconnect reasons
Look for network timeout errors
This helps determine whether the issue is client-side or server-side.
Using Log Center for Real-Time Monitoring
To move from reactive to proactive monitoring:
Create alert rules for failed login thresholds
Enable email notifications
Forward logs to an external SIEM
Combine VPN logs with firewall logs
Correlating VPN and firewall events gives better context for security analysis.
Best Practices for VPN Log Management
To maintain audit readiness:
Set log retention policies aligned with compliance needs
Restrict access to logs
Export logs periodically
Back up critical audit records
Logs should be protected from tampering and unauthorized access.
Synology-Specific Security Benefits
DSM 7 enhances logging granularity and integrates VPN logs with:
Firewall monitoring
Account auto-blocking
Certificate management
Snapshot protection
This creates a unified visibility framework when properly configured.
About Epis Technology
Epis Technology helps organizations implement centralized monitoring for VPN and NAS environments. The team configures detailed logging, integrates Log Center with external monitoring platforms, and aligns retention policies with compliance requirements. They also combine VPN monitoring with Microsoft 365 backup visibility and hybrid disaster recovery planning to ensure complete operational oversight. Instead of manually checking logs, businesses gain structured real-time alerting and reporting.