A Guide to Eliminate QuickBooks Error 400 – Bad Request

Various problems can occur when you attempt to connect to the online bank account using QuickBooks Online. One of the common issues that you might grapple with is QuickBooks error 400, which can also manifest when connecting to the QBO or QB Self-Employed server. Here’s what you might witness on your system’s screen:

Failure to access the online bank account will prevent you from managing your transactions for different projects. Consequently, you can experience delays in completing essential tasks, ultimately leading to a drastic fall in the overall business efficiency & productivity. Therefore, it is super important for you to overcome this difficulty as quickly as possible.

Alright, then, let’s explore the guide to understand the reasons behind this error and discover different tactics to fix it easily.

If you want immediate help to fix QuickBooks error 400, dial +1-(855)-955-1942 to contact a QB professional. 

Why Do You Get the Error Code 400 in QuickBooks Online?

Here are the main factors that can trigger QuickBooks error 400:

• QuickBooks might fail to connect to the server due to misconfigured internet settings.
• The network connection could be weak or unstable.
• Browser cache or Intuit-specific cookies might trigger the HTTP server’s bad request error.
• The bank or credit card website may be experiencing technical issues.
• You might not have properly entered the QBO or QB Self-Employed login URL.
• Your Internet service connection might be slow or unstable.
• It is possible that you may not have installed the latest web browser updates.
• Malware attacks on various system files on your computer might hinder access to various websites via the web browser app.
• Any disruption by Windows Firewall can prevent you from accessing the bank’s server using the web browser application.
• An overloaded QBO server might also cause this error code.

Now that you know about the main causes of this problem, let’s move on to the following section to learn how to eliminate it effectively.

7 Things You Should Do to Resolve QuickBooks Error 400

Here are the resolutions that you should implement whenever you run into QuickBooks error 400. Ensure that you utilize these methods in the exact sequence as detailed below.

1. Check Your Official Bank’s Website

The first thing that you must do to eliminate the 400 error message in QuickBooks is to access the official bank’s website via your web browser. This will help you to verify if the bank’s server is temporarily down or unavailable. If you cannot access the bank’s website using the browser app, you can wait for some time. Additionally, you can contact the bank’s customer service for further information about the server status.

Once you are sure that the bank’s server is working perfectly, you can go back to QBO to connect to it. If, however, you encounter QuickBooks error 400 even now, try the next solution.

2. Update Your Bank Account Connection

Updating the bank account connection in QBO will refresh the entire setup. As a result, you will be able to easily access your online bank account. Here’s what you need to do: 

• Go to the Banking tab in QB Online.
• Select the blue tile at the top of the bank account you want to update.
• Click the Update button. If prompted for authentication, follow the instructions, as some banks may require it.
• Finally, connect to the online bank account & work on your projects.

Do you still get QuickBooks error 400? If that’s the case, consider checking the QBO & QB Self-Employed login URL as explained below.

3. Verify the QBO & QB Self-Employed Login URL

You may get the QB 400 error message code if you haven’t entered the login URL for your online software correctly. To fix this problem, you can do the following:

• In the web browser, go to the panel where you have entered the login URL for QB Online or QB Self-Employed.
• At this point, ensure that you have entered the login URL properly. The valid login URLs are as follows:

  • QuickBooks Online
  • QuickBooks Self-Employed

If you get QuickBooks error 400 even after entering a valid login URL for your software, try updating your web browser as mentioned below.

4. Install the Web Browser Updates

Outdated web browsers can provoke various issues, such as the 400 error code & error message code 355, when connecting to the online banking service account using QBO. Here’s how you can easily update different browser apps:

A. Google Chrome

To update Google Chrome on your computer, you can do the following:

• Open Google Chrome and click the three vertical dots in the top-right corner.
• Go to Help and select About Google Chrome.

• Click Update Google Chrome. If this option isn’t visible, your browser is already up to date.
• Once the update finishes downloading, click Relaunch to apply the changes.

B. Mozilla Firefox

Here’s how you can update Mozilla Firefox on your system:

• Open Firefox and click the menu button (three horizontal lines) in the top-right corner.
• Select Help and choose About Firefox.
• Firefox will automatically check for updates and download them if available.
• Once the download is complete, click Restart to Update Firefox.

C. Microsoft Edge

You can install Microsoft Edge updates by following these points:

• Open Microsoft Edge and click the menu button (three horizontal dots) in the top-right corner.

• Select Help and Feedback and click About Microsoft Edge.
• Edge will automatically check for updates.
• If an update is available, it will download and install it.
• Once the update is complete, click Restart to finish updating Edge.

If you continue to notice QuickBooks error 400, consider using the browser in private mode, as elaborated below.

5. Run the Web Browser in Incognito Mode

Heavy cache data in the web browser can hinder you from accessing online banking services via QBO. When you run the browser in incognito (or private) mode, the cache data doesn’t disrupt you from connecting to the online bank account. Here’s the table that shows how you can run different browser apps in private mode:

Do you still face QuickBooks error 400? If so, consider deleting the cache data in the browser app as explained below.

Also Read: Fix QuickBooks Online Banking Error 101

6. Remove Cache Data From Your Browser App

Erasing the cache and cookie data from the browser will allow faster access to the online banking account via QBO. It will help fix the 400 error message code & error code 571. Below are the different processes that you can implement to erase the cache and cookie data from different web browsers. You should follow the process depending on the web browser that you currently use to access QB Online. 

A. Google Chrome

You can remove the cache data from Google Chrome by implementing the following steps:

• Access Google Chrome and navigate to the top-right corner to click the More icon.
• Choose Delete Browsing Data, and after that, you have to select the time range to erase the browsing data, such as Last hour/All Time.

• After selecting the time range, you can tap the Delete Data button to remove the cache data.

B. Mozilla Firefox

Here are the steps that you can implement to remove the cache and cookies data from Mozilla Firefox:

• Firstly, access Mozilla Firefox and tap the Menu icon located at the top-right corner of the window.
• Choose Settings, and after that, click Privacy & Security.
• Jump to the Cookies and Site Data section, and tap Clear Data.
• At this point, move to the Clear Browsing Data and Cookies window and select Everything using the dropdown menu.

• Check the Temporary Cached Files and Pages checkbox. You need to click Clear.
• Finally, you will be able to remove all the cache and cookie data from Mozilla Firefox.

C. Safari For Mac

To remove the cache and cookie data from Safari for Mac, you can do the following:

• Launch the Safari app on your Mac, and after that, you should select Safari.
• Click Settings, and after that, you must tap Privacy.
• At this point, click Manage Website Data and tap Remove All.

• Finally, you will be able to completely erase cache and cookies from the Safari app.

D. Safari For iPad and iPhone

The following steps will help you remove the cache and cookie data from the Safari app on your iPad and iPhone:

• Access the Safari browser on your iPad and iPhone and click Settings.
• Tap the Clear History and Website Data option and wait until all the cache & cookie data are erased.

• Finally, you can run QBO on the Safari app to finish various tasks.

E. Microsoft Edge

You can effortlessly remove the cache and cookie data from Microsoft Edge by following the steps detailed below:

• Access the Microsoft Edge browser and jump to the Settings and More tab.
• Click Settings, and after that, you should select the Privacy, Search, and Services option.
• Go to the Delete Browsing Data section, and after that, tap the Clear Browsing Data Now option.

• Using the Time Range dropdown, you can select the time period to erase the cache and cookie data.
• Finally, tap Clear Now and wait until you have completely erased the selected cache and cookie data.

If you notice that the 400 error message in QuickBooks still persists, consider using the next resolution.

7. Utilize a Different Browser Application

There are various web browser apps that you can utilize to access QBO. Switching to a different browser to run QBO will help you access your online banking account quite easily. Here’s the table that lists various browsers that you can try on your computer to access QBO:

Finally, you can access QBO and open your online banking account to obtain various transactions.

Tips to Ensure Smooth Connection to Banking Account Via QBO

Here are some really great tips that you can follow to ensure faster access to online banking services using QB Online:

• Use the Correct Login URL: Always enter the accurate QuickBooks Online or Self-Employed login URL.
• Ensure a Stable Internet Connection: Avoid connection drops by using a reliable and high-speed Internet connection.
• Clear Browser Cache and Cookies: Regularly clear your browser’s cache and Intuit-specific cookies to prevent errors.
• Update Your Browser: Keep your browser (Chrome, Firefox, Edge) updated to the latest version for compatibility.
• Disable Browser Extensions: Turn off unnecessary browser extensions that might interfere with QuickBooks functionality.
• Allow QuickBooks Through Firewall: Ensure your firewall or antivirus isn’t blocking QuickBooks services.
• Verify Bank Server Status: Check if your bank’s website or server is down before performing transactions.

Wrapping Up

In this comprehensive guide, we have discussed several methods to troubleshoot QuickBooks error 400. Hopefully, you can now seamlessly connect to the online bank account using QB Online. If, however, you still face difficulties or have a query, you can contact a QB expert for immediate guidance.

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Robert Downe SEO Editor

Robert is an accounting professional, well versed in many accounting software. He has established himself as a QuickBooks expert over the past ten years. Robert finds great joy in assisting businesses and accountants all over the country so that they can manage their finances seamlessly. He does so individually and through his blogs.

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