Nebula Control Center 20.20 Release Notes and Scheduled Maintenance

Nebula Control Center (NCC) release 20.20 introduces new features and improvements for network management, wireless LAN, switching, and security firewalls.

The following sections summarize the changes announced in the official release notes.

Important Notice:

Nebula Control Center will be temporarily unavailable while the system is upgraded to release 20.20.

Maintenance details:

• Reason: Upgrade to Nebula Control Center release 20.20.
• Start time: October 19, 2026, at 00:20 UTC.
• End time: October 19, 2026, at 01:00 UTC.
• Expected duration: 40 minutes.

Impact: All users will be logged out of Nebula Control Center and will be unable to access the service during the maintenance period.

If you experience any issues after the maintenance, please contact Zyxel Technical Support or visit the Zyxel Community to post a new question or send a private message to Zyxel_CSO.

The following improvements are available for organization-wide and site-wide management:

Common NCC (Organization,Site-wide,etc.):

1. Added MSP custom domain support to enhance branding flexibility. (Nebula MSP Pack license is required)
2. PAYG now supports GSP subscription without Pro.
3. Administrator now can setup PAYG from License & Inventory page.
4. Added Uptime information in the device detail page.
5. Password complexity for devices has been strengthened.
6. Enhance UI/UX for changing device's Map location in the device detail page and on Map & Floor Plans.

Wireless LAN (WLAN):

1. Add IoT Optimize to SSID settings for one-click IoT-friendly configuration.
   Basic mode:
   Advanced mode:
2. RADIUS accounting interim update interval can be adjusted.
3. All WiFi 7 models with 6GHz band support 20/40MHz channel width for 6GHz.

Switching:

1. Added DHCP Server support on layer-3 switch series. (initially available on XMG2230 series). (Nebula Pro Pack license is required)
2. Added XMG2230 Cloud Stacking support. (Nebula Pro Pack license is required)
3. Increased the number of source ports supported for mirroring.
4. The PoE schedule now supports a minimum interval of 1 minute between time slots.

Security Firewall:

1. Added Secure WiFi support for USG FLEX H series.
2. Added Nebula SD-VPN supports remote access VPN for USG FLEX H series.
3. Added Loopback interface and Local out route to support the Firewall acting as a service endpoint and management client for USG FLEX H series.
4. DNS Domain Zone Forwarder supports "Auto" interface for USG FLEX H series.
5. Enhance UI/UX for adding new objects for USG FLEX H series.

Security Router:

N/A

Broadband Router:

N/A

Accessory:

N/A