By Kelsey / Last Updated September 7, 2020


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Google Backup and Sync Login Problem

“Hi guys, did anybody from you get any support on this issue? It's more than days I can't sign in to my Google Backup and Sync account from home PC, at work office it works but at home nothing, it's just say - Google Backup and Sync: 400. That’s an error. The requested URL was not found on this server. Did anyone know of any effective solutions?”

Error 400 Thats An Error

Why Google Backup and Sync Can’t Sign in?

As the desktop client of Google Drive, Google Backup and Sync has played an important role in backing up computer files to Google Drive and managing files in the cloud, bringing convenience to many users.

But when many users tried to log in, they received the prompt of Google Backup and Sync error 400. The problem that Google Drive and Backup can’t sign in is an occasional problem. The old version of the application, the blocking of the Windows firewall, the wrong Google Drive path, and the interference of antivirus software may cause this problem.

How to Fix Backup and Sync “Error 400”?

Please go through this section to learn how to fix Google Backup and Sync error 400 correctly.

Method 1. Update the Google Backup and Sync

If your program version is too old or damaged, navigate to to download and install the latest version of Google Backup and Sync and try to log in again to see if it works properly.

Method 2. Check firewall/antivirus programs

Firewalls or antivirus programs may prevent Google Backup and Sync, you may need to check them.

  • Navigate to Control Panel > System and Security > Windows Defender Firewall > Allowed apps, and click Allow apps to communicate through Windows Defender Firewall. Here you can see a list of all services allowed/forbidden by the firewall. Search for "Backup and Sync" and enable it under the Private and Public columns.

Enable Backup And Sync On Firewall

  • If anti-virus software is installed on your computer, you need to check its settings to ensure that Backup and Sync is allowed, or you can uninstall anti-virus software on your computer. Then restart the Google Backup and Sync application to see if it can be used normally.

Method 3. Re-establish the Google Drive path

You need to close Backup and Sync from the task tray before re-establishing the Google Drive path.

  • Navigate to the computer's File Explorer and enter C: UsersUSERNAMEAppDataLocalGoogle in the folder path box. Then replace USERNAME in the folder path with your PC username. Then right-click on the Drive folder and click Delete to delete it.

Method 4. Remove Google from Trusted sites

If you receive a Google Backup and Sync login problem when trying to access Google Drive, the issue may be from the list of Trusted sites.

  • Hold down the "Windows+S" key, enter Internet options in the search box, and then click Internet Options.

Internet Options

  • Select Trusted sites under the "Security" tab. Then click Sites.

Security Trustedsites Sites

  • From all the trusted sites listed, select Google, and then click Remove. Finally, save the changes and Close the Internet Options window.

Remove Google Website

Method 5. Check your proxy settings

Many users use proxies to hide their identities, but proxy servers sometimes interfere with Google Backup and Sync.

  • Hold down the "Windows + I" key to open the Settings. Then navigate to the Network & Internet.

Network And Internet

  • Select Proxy in the left menu bar. Then toggle the switch on the right side of the window to disable all options.

Proxy Disable All Options

Backup and Sync Common Error Solutions

Although Google Backup and Sync is already a professional sync application, there will still be problems in using it. Here are some of the most common error codes and solutions for Google Backup and Sync.

Error 1603

This is a common error when installing Google Backup and Sync on Windows. Repeated installation of applications, folder encryption, etc. may cause it to happen.



1. Hold down the "Windows+S" key, type gpedit.msc in the search box and press Enter.

2. Click Administrative Templates > Windows Components > Windows Installer, and then double-click Prohibit User Installs.

1603 Prohibit User Installs

3. Select Not Configured and click OK to save the changes. And try to install the application again.

1603 Not Configured

Error 2d9827ff

When you use the program, it may notify you of "Sorry, Backup and Sync needs to quit". This problem is usually caused by an internal problem when updating Google Backup and Sync.

Sorry, Backup and Sync needs to quit


1. Open the File Explorer, type %UserProfile%\AppData\Local\Google\Explorer, then rename the Drive folder to Drive.OLD.

Rename Drive Folder

2. If you have trouble renaming, go to the task manager and stop the googledrivesync.exe process and try again.

An Alternative Tool to Backup PC Files to Google Drive - AOMEI Backupper Standard

To avoid being overwhelmed every time Google Backup and Sync makes an error, you can use Backup and Sync's free alternative tool - AOMEI Backupper Standard to automatically sync PC files to Google Drive.

Step 1. Download AOMEI Backupper Standard, install, and boot it to your desktop.

Step 2. To backup files to Google Drive, you need to first click Backup and then select File Sync.

File Sync

Step 3. Click Add Folder, and then select the folder to be backed up to Google Drive.

Add Folder

Step 4. Click the inverted triangle, and then click Select a cloud drive to select Google Drive as the target location.

select a cloud drive

Step 5. Then, click Start Sync to start the task, after completing the progress, click Finish to exit.

Wrapping Things up

The above is about the reason why Google Backup and Sync error 400 happened and the effective methods to repair it. These detailed steps will help you solve this problem. However, the “Google Backup and Sync not working” issue may be due to other problems. You can use the free file sync software AOMEI Backupper Standard to back up your PC files to Google Drive.