The 502 bad gateway can occur when your computer's server tries to connect to the QuickBooks server and it fails. Often times if you refresh your screen by holding CTRL+R on Windows / CMMD + R on Mac, you should be able to reload QuickBooks.
If you're still receiving the 502 bad gateway, could you let us know what browser are you using to log in to QuickBooks?
Thanks for getting back to us with additional information, murphycivil.
I've checked here and haven't found any open investigation about the error message when using the Desktop application. I recommend performing some basic troubleshooting to get back on track with using QuickBooks.
Let's start with clearing cache through these steps:
Open the QuickBooks app.
Select the Help tab in the upper-right corner.
Choose Reset App Data.
Check out this screenshot for a visual reference on the steps:
If the error continues, please proceed with uninstalling and reinstalling the application. For the detailed instructions, I recommend clicking the article below (scroll down to How do I uninstall the app?):
Let's perform some basic browser troubleshooting steps to isolate the error. This error occurs when there are too much data in your default browser. To fix this, open your QuickBooks Online account using a private browser.
Here are the keyboard shortcuts you can use:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox and Microsoft Edge: press Ctrl + Shift + P
Safari: press Command + Shift + N
Once signed in, see if you still get the error. If this works, clear the cache of your regular browser to get a clean slate. You can also use other supported browsers if private mode browsing doesn’t work.
You can also seek self-help articles on our QuickBooks help articles page, this is to help QuickBooks users like you finish your work in no time.
If you need further assistance with accessing your QBO account, please post a response below. I'm always here to help you. Have a good one.
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