---
title: "Concurrent User Limit Reached in Business Central / NAV"
description: "Concurrent User Limit Reached in Business Central / NAV"
keywords: "Concurrent User Limit Reached in Business Central / NAV 400 Error Message Connections"
url: "https://myrapidi.com/wiki/concurrent_user_limit_reached_in_business_central_nav"
locale: "en"
published: "2025-11-10T10:23:04Z"
modified: "2025-11-10T10:23:04Z"
---

When reading data from NAV or Business Central on premise, you might see the below error message: 

> _“Ihre Programmlizenz lässt nicht zu, dass mehr Benutzer gleichzeitig arbeiten…”_  
> (_Your license does not allow more concurrent users. Wait until another user stops using the system._)

**What this means:**  
  
 Your Microsoft Dynamics NAV/Business Central license has a limited number of **concurrent users**. Each active session counts toward this limit, including integration/service calls. When the limit is reached, new connections are blocked and the integration receives a **400** error.  
  
**How to Troubleshoot**

**1. Check Active Sessions**

1. Open **Business Central / NAV**.
2. Go to **Administration** → **Sessions** (or search _Sessions_).
3. Review the list for:
  - Idle/inactive sessions
  - Service or integration sessions stuck open

**2. Free Up a Session**

- Select unnecessary or idle sessions.
- Choose **End Session** to release the slot.

> **Note:** Ending sessions will disconnect that user or service. Make sure this is acceptable.

**Alternative Immediate Fix**

Restart the **BC/NAV Service Tier** to clear stale sessions.

- This will temporarily disconnect all users and integrations.
- Use only if sessions cannot be safely cleared individually.