Troubleshooting 'Maximum Number of VDOMs Reached' Error
A FortiGate administrator receives an error when trying to create a new VDOM: 'Maximum number of VDOMs reached.' However, the FortiGate model supports more VDOMs. What could be the issue?
Quick Answer
The answer is that the VDOM license is not installed or has expired. This error occurs because FortiGate enforces Virtual Domain (VDOM) creation through a separate license file, not solely through hardware capability; even if the physical model supports dozens of VDOMs, the device restricts the count to the default limit—typically one or two—unless a valid, non-expired VDOM license is applied. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding of FortiGate licensing architecture versus hardware specifications, often appearing as a trap where candidates assume the hardware limit is the only constraint. A common mistake is overlooking that license expiration or absence triggers the same error as hitting a hardware ceiling. Memory tip: Think “license, not silicon”—the error message always points to the software license, not the chassis capability.
⚠ Common exam trap
A common mix-up: candidates assume the error is due to a hardware limitation or configuration mode, but Fortinet specifically tests the distinction between hardware capability and software licensing enforcement.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VDOM license is not installed or is expired
The error 'Maximum number of VDOMs reached' occurs when the FortiGate attempts to exceed the licensed VDOM count, even if the hardware model supports more. FortiGate VDOM licensing is enforced via a separate license file; without a valid, non-expired license, the device restricts VDOM creation to the default (often 1 or 2) or previously licensed limit. This is a common issue when a license has expired or was never installed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The VDOM license is not installed or is expired
Why this is correct
VDOM licenses are required to create additional VDOMs beyond the base limit.
- ✗
The administrator is in the wrong VDOM context
Why it's wrong here
VDOM creation is done from the root VDOM, but the error indicates a limit, not context.
- ✗
The FortiGate is in transparent mode
Why it's wrong here
Transparent mode does not limit VDOM count.
- ✗
The FortiGate needs a firmware upgrade
Why it's wrong here
Firmware upgrade does not increase VDOM limit without license.
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Same concept, more angles
1 more way this is tested on NSE7
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator wants to limit the number of VDOMs that can be created on a FortiGate. What should the administrator configure?
easy- A.Use the 'config vdom' command to delete unused VDOMs
- ✓ B.Set the 'max-vdom' option under 'config system global'
- C.Configure the VDOM license on FortiManager
- D.Set the 'vdom-admin' option to 'enable'
Why B: The 'max-vdom' option under 'config system global' directly limits the number of VDOMs that can be created on a FortiGate. This setting enforces a hard cap on the total VDOM count, regardless of licensing or administrative roles. By default, the value is set to 10 on most models, but it can be increased up to the maximum supported by the platform or license.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.