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<h1>Concurrent User Limit Reached in Business Central / NAV</h1>
<div class="trix-content"><p>When reading data from NAV or Business Central on premise, you might see the below error message:&nbsp;</p><blockquote><em>“Ihre Programmlizenz lässt nicht zu, dass mehr Benutzer gleichzeitig arbeiten…”</em><br> (<em>Your license does not allow more concurrent users. Wait until another user stops using the system.</em>)</blockquote><p><strong>What this means:<br></strong><br>&nbsp;Your Microsoft Dynamics NAV/Business Central license has a limited number of <strong>concurrent users</strong>. 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 <strong>400</strong> error.<br><br><strong>How to Troubleshoot</strong></p><p><strong>1. Check Active Sessions</strong></p><ol><li>Open <strong>Business Central / NAV</strong>.</li><li>Go to <strong>Administration</strong> → <strong>Sessions</strong> (or search <em>Sessions</em>).</li><li>Review the list for:<ul><li>Idle/inactive sessions</li><li>Service or integration sessions stuck open</li></ul></li></ol><p><strong>2. Free Up a Session</strong></p><ul><li>Select unnecessary or idle sessions.</li><li>Choose <strong>End Session</strong> to release the slot.</li></ul><blockquote><strong>Note:</strong> Ending sessions will disconnect that user or service. Make sure this is acceptable.</blockquote><p><strong>Alternative Immediate Fix</strong></p><p>Restart the <strong>BC/NAV Service Tier</strong> to clear stale sessions.</p><ul><li>This will temporarily disconnect all users and integrations.</li><li>Use only if sessions cannot be safely cleared individually.</li></ul></div>
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