# Useful Solutions to Eliminate QuickBooks Error 400
<p>QuickBooks uses the internet to integrate with web services and execute its online accounting tasks. However, users find themselves in problematic situations when QuickBooks Error 400 develops on their PC, indicating network connectivity issues. If the accounting tasks on your QB fail due to this error, go through this complete blog for the reasons that cause it to develop and the practical techniques that can be used to rectify it.</p><p></p><blockquote><p><b>Rectify the error quickly with the troubleshooting directions provided by our QB support team at 1.855.738.2784.</b></p></blockquote><h2 style="text-align: left;">Primary reasons for the occurrence of this QB error on your computer</h2><p>You’ll run into error code 400 in QuickBooks during data syncing with the Intuit servers or randomly while performing an accounting task. The possible reasons you run into this QB network connectivity error are mentioned below in detail-</p><p></p><ol style="text-align: left;"><li>Intuit servers don’t respond to the requests made by your QBDT due to network connectivity issues.</li><li>The TLS settings on your computer aren’t properly arranged, which causes a lapse in the network connection.</li><li>The internet connection speed delivered by your service provider isn’t adequate to run QB smoothly.</li></ol><div style="text-align: center;"><b>You May Also Read: <a href="https://blog.accountinghelpline.com/quickbooks-desktop-issues/quickbooks-error-td500/">How to fix QuickBooks Error TD500?</a></b></div><p></p><h2 style="text-align: left;">Simple methods to prevent this QB error from developing again</h2><p>QuickBooks API 400 error instantly breaks the software’s connection to the Intuit servers, and all the ongoing accounting tasks are instantly stopped. The preventive measures you must take to prevent the error from developing again are mentioned below-</p><h3 style="text-align: left;">Solution 1- Configure your system settings to arrange the TLS settings correctly</h3><p>The Transport Layer Security (TLS) settings ensure that your system’s internet connection remains secure and that no unauthorized access is made to damage the data transferred over it. In case your system has an incorrect setup of the TLS settings, you can face trouble while performing online tasks in your system applications. This can also be a reason for QuickBooks online error 400, which stops the accounts from accessing the internet. You can prevent the issues from developing by fixing the TLS settings as described in the following steps-</p><p></p><ol style="text-align: left;"><li>Launch the Run window and type ‘inetcpl.cpl’ in the command section.</li><li>Pressing Enter or clicking Ok will open the Internet Properties window, where you need to select the Advanced tab.</li><li>Scroll down the settings list and mark the Use TLS 1.2 checkbox among all the TLS settings.</li><li>Close the window after tapping Apply to save the settings.</li><li>If the error still stops the online tasks in QB, jump to the next solution.</li></ol><p></p><h3 style="text-align: left;">Solution 2- Ensure your system’s internet speed satisfies QB requirements</h3><p>QuickBooks can also run into connectivity issues if the internet speed on your system is too low, which can cause data loss during upload/download. You can easily check the internet speed using an online tool, as shown in these steps-</p><p></p><ol style="text-align: left;"><li>Open Google’s homepage and enter ‘internet speed test’ in the search column.</li><li>Press Enter to begin the search and open the top link to open the internet speed test tool.</li><li>Click Start and wait until it finds out the internet speed on your PC.</li></ol><p></p><p>If your system’s internet speed isn’t in the range of 1.5Mbps or 3Mbps (QB Requirements), change your network provider or upgrade the hardware.</p><h2 style="text-align: left;">Conclusion</h2><p>We are now at the end of our blog describing why <b>QuickBooks Error 400</b> breaks the software’s connection to the Intuit servers. The valuable approaches to rectifying the connectivity issues are also given in the blog, and we hope you use them to prevent the error from emerging again.</p><p><b>Talk to our QB support team at 1.855.738.2784 to resolve your remaining queries.</b></p><p style="text-align: center;"><b>Recommended Reading: <a href="https://hackmd.io/@edwardmartinqb/effective-solutions-to-prevent-quickbooks-error-15102">How do I fix QuickBooks Error 15102?</a></b></p>