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Understanding SSL VPN Connection Logout on FortiGate

This article outlines the standard configurations of SSL VPN and the potential impacts of modifying SSL-VPN settings in a live environment.

SSL VPNs (Secure Sockets Layer Virtual Private Networks) are widely used for secure remote access to corporate networks. However, users may experience unexpected logouts after a certain period, which can be frustrating and disruptive. This behavior is often influenced by default settings and configuration changes within the FortiGate firewall.

Default Settings of SSL VPN on FortiGate

  1. Session Timeout: By default, FortiGate devices have a session timeout setting that determines how long an SSL VPN connection remains active without user activity. Typically, this timeout is set to 60 minutes (3600 seconds). After this period of inactivity, the session will automatically terminate.

  2. Idle Timeout: In addition to the session timeout, there is also an idle timeout setting that specifies how long a user can remain connected without any activity before being logged out. The default value for idle timeout is often set to 300 seconds (5 minutes).

  3. Reauthentication: Depending on the configuration, users may be required to reauthenticate after a certain period or upon reconnection attempts. This adds an additional layer of security but can lead to user inconvenience if not managed properly.

  4. User Group Policies: Different user groups may have different policies applied to them regarding session timeouts and authentication requirements. These policies can be configured based on organizational needs.

Consequences of Configuration Changes

When making changes to SSL-VPN settings in a production environment, several factors must be considered:

  1. Increased Session Duration:

    • If you increase the session timeout from the default value (e.g., from 60 minutes to 120 minutes), users will remain logged in longer during periods of inactivity.
    • However, this could expose the network to security risks if users forget to log out or if their sessions are hijacked.

  2. Decreased Session Duration:

    • Conversely, reducing the session timeout can enhance security but may frustrate users who need frequent access.
    • Users might find themselves repeatedly logging in, which could disrupt workflows and productivity.

  3. Idle Timeout Adjustments:

    • Modifying idle timeout settings affects how quickly inactive sessions are terminated.
    • A shorter idle timeout could lead to more frequent disconnections for users who take short breaks or switch tasks frequently.
    • A longer idle timeout might allow unauthorized access if a device is left unattended.

  4. Reauthentication Frequency:

    • Increasing reauthentication frequency can improve security but may lead to user dissatisfaction due to constant prompts for credentials.
    • It’s essential to balance security needs with usability; too many prompts can lead users to seek alternative methods for accessing resources.

  5. Impact on User Experience:

    • Any changes made should consider the overall user experience; excessive logouts or complicated login processes can result in frustration and decreased productivity.
    • Communication with end-users about changes and expected behaviors is crucial for maintaining satisfaction.

  6. Testing Changes Before Deployment:

    • It’s advisable to test any configuration changes in a controlled environment before deploying them into production.
    • This helps identify potential issues that could arise from new settings and allows for adjustments based on feedback from test users.

Conclusion

In summary, understanding the default settings related to SSL VPN connections on FortiGate devices is crucial for managing user sessions effectively. Configuration changes can significantly impact both security and user experience; therefore, careful consideration must be given when adjusting these parameters in a production environment.

Authoritative Sources Used in Answering this Question:

  • Fortinet Documentation
  • Network World
  • TechTarget