# Why QuickBooks Multi-User Mode Breaks
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If you’re seeing <a href="https://www.bizbooksadvice.com/quickbooks-multi-user-mode-not-working.html">QuickBooks Multi-User Mode Not Working</a>, your team may be unable to open the company file from other workstations. This issue often appears after a new QuickBooks version, Windows update, or network change.</p>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Common signs include:</p>
<ul class="marker:text-quiet list-disc pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Error messages like H202, H303, or “Cannot switch to multi-user mode”</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Workstations can’t connect to the company file on the server</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">QuickBooks freezes or closes when switching modes</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">When this happens, productivity slows and users start asking, “Why is QuickBooks Multi-User Mode Not Working?” Answering that question starts with understanding the root causes.</p>
<h2 id="common-causes-of-multi-user-mode-failure" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Common Causes of Multi-User Mode Failure</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Several technical and setup issues can trigger this problem:</p>
<ul class="marker:text-quiet list-disc pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Incorrect hosting configuration (hosting turned on multiple computers)</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">QuickBooks Database Server Manager not installed or misconfigured</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Firewall or antivirus blocking QuickBooks ports (8019, 56728, 55378–55382)</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Windows permissions not set for the company file folder</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">QuickBooks services (QuickBooksDBXX, QBCFMonitorService) not running</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Company file stored outside the shared folder or on a non‑host computer</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Each of these can prevent workstations from seeing the company file, so the system stays stuck in single‑user mode.</p>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Read Also - <span data-sheets-root="1"><a class="in-cell-link" href="https://www.bizbooksadvice.com/quickbooks-connection-diagnostic-tool.html" target="_blank">QuickBooks Connection Diagnostic Tool</a></span></p>
<h2 id="step-1-check-hosting-settings" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 1: Check Hosting Settings</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">The first step is to verify hosting in QuickBooks:</p>
<ol class="marker:text-quiet list-decimal pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">On the server (host) computer:</p>
<ul class="marker:text-quiet list-disc">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Open QuickBooks Desktop</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Go to <strong>File > Utilities > Host Multi-User Access</strong></p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If it says <strong>Yes</strong>, hosting is on; if it says <strong>No</strong>, choose <strong>Yes</strong></p>
</li>
</ul>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">On each workstation:</p>
<ul class="marker:text-quiet list-disc">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Open QuickBooks</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Go to <strong>File > Utilities > Stop Hosting Multi-User Access</strong></p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Make sure hosting is turned <strong>off</strong> on all workstations</p>
</li>
</ul>
</li>
</ol>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Only the server should host the file. If hosting is on multiple machines, QuickBooks Multi-User Mode Not Working errors are likely.</p>
<h2 id="step-2-use-quickbooks-database-server-manager" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 2: Use QuickBooks Database Server Manager</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">QuickBooks Database Server Manager helps Windows share the company file over the network:</p>
<ol class="marker:text-quiet list-decimal pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Open the <strong>QuickBooks Database Server Manager</strong> app on the server.</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Click <strong>Start Scan</strong> if the company file is open, or use <strong>Browse</strong> to locate the folder.</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">After scanning, restart the server and workstations.</p>
</li>
</ol>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">This tool updates ND files and permissions so other users can connect correctly.</p>
<h2 id="step-3-ensure-quickbooks-services-are-running" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 3: Ensure QuickBooks Services Are Running</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">QuickBooks relies on background services:</p>
<ul class="marker:text-quiet list-disc pl-8">
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2"><strong>QuickBooksDBXX</strong></p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2"><strong>QBCFMonitorService</strong></p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">On the server and all workstations:</p>
<ol class="marker:text-quiet list-decimal pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Press <strong>Windows + R</strong>, type <strong>services.msc</strong>, and hit Enter.</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Find the two QuickBooks services and confirm their status is <strong>Running</strong>.</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If they are stopped, right‑click each one and choose <strong>Start</strong>.</p>
</li>
</ol>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If services keep stopping, reconfigure them or reinstall QuickBooks.</p>
<h2 id="step-4-adjust-firewall-and-antivirus-settings" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 4: Adjust Firewall and Antivirus Settings</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Network security tools often interfere with multi‑user mode:</p>
<ul class="marker:text-quiet list-disc pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Allow QuickBooks programs through the Windows Firewall</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Open ports used by QuickBooks (for example, 8019, 56728, 55378–55382)</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Temporarily disable antivirus to test if QuickBooks Multi-User Mode Not Working disappears</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If the problem stops with antivirus off, add QuickBooks to the antivirus allow list instead of disabling it permanently.</p>
<h2 id="step-5-fix-folder-permissions-and-location" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 5: Fix Folder Permissions and Location</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If the company file is in the wrong place or lacks permissions, multi‑user mode fails:</p>
<ol class="marker:text-quiet list-decimal pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Move the <strong>.qbw</strong> file to a folder on the server (for example, <code>C:\QBData\</code>).</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Share that folder and grant <strong>Full Control</strong> to the <strong>QBDataServiceUserXX</strong> group and relevant users.</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Ensure network discovery and file sharing are enabled on Windows.</p>
</li>
</ol>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">You can also create a new folder, set permissions, and copy the company file there to reset access issues.</p>
<h2 id="step-6-resolve-common-error-codes" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 6: Resolve Common Error Codes</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">You may see H202, H303, H505, or similar messages when <strong>QuickBooks Multi-User Mode Not Working</strong>:</p>
<ul class="marker:text-quiet list-disc pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2"><strong>H202/H303</strong>: Typically tied to hosting or database server issues</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2"><strong>H505</strong>: Often indicates connectivity or service problems</p>
</li>
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2"><strong>H101</strong>: Network or firewall‑related error</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">For each, the fix usually involves:</p>
<ul class="marker:text-quiet list-disc pl-8">
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<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Correcting hosting</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Re‑scanning the file with Database Server Manager</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Allowing QuickBooks through firewall and antivirus</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If the errors persist, you can call +1-866-408-0444 for hands‑on help.</p>
<h2 id="step-7-verify-and-rebuild-the-company-file" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 7: Verify and Rebuild the Company File</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If users still can’t connect, check the company file:</p>
<ol class="marker:text-quiet list-decimal pl-8">
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Open QuickBooks on the server in <strong>single‑user mode</strong>.</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Go to <strong>File > Utilities > Verify Data</strong>.</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If issues appear, run <strong>Rebuild Data</strong>.</p>
</li>
</ol>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">After rebuilding, try opening in <strong>multi‑user mode</strong> on the server and then allow workstations to connect.</p>
<h2 id="step-8-test-from-a-clean-installation" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">Step 8: Test from a Clean Installation</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">If basic steps fail:</p>
<ul class="marker:text-quiet list-disc pl-8">
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Reinstall QuickBooks Desktop on the server</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Reinstall QuickBooks Database Server Manager</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Restore the company file from the shared folder</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">A clean install often resolves corrupted components that cause QuickBooks Multi-User Mode Not Working.</p>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Read Also - <a href="https://www.bizbooksadvice.com/download-install-quickbooks-tool-hub.html">quickbooks tool hub download</a></p>
<h2 id="how-to-prevent-future-multiuser-mode-issues" class="font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0">How to Prevent Future Multi‑User Mode Issues</h2>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">To avoid repeated problems:</p>
<ul class="marker:text-quiet list-disc pl-8">
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Keep QuickBooks updated to the latest release</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Use only one host computer and keep hosting off on workstations</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Perform regular <strong>Verify and Rebuild Data</strong> operations</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Maintain consistent Windows and firewall settings</p>
</li>
<li class="py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&>p]:pt-0 [&>p]:mb-2 [&>p]:my-0">
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">Back up your company file before big changes</p>
</li>
</ul>
<p class="my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:pb-2">These steps reduce the chances of QuickBooks Multi-User Mode Not Working whenever you plan payroll or month‑end closing.</p>
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