Before opening files in this location, add the web site to your trusted sites list

Milan Stanojevic avatar. By: Milan Stanojevic
6 minute read
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ERROR_FORMS_AUTH_REQUIRED error usually comes with Before opening files in this location, you must first add the web site to your trusted sites list message and it can cause problems with SharePoint. This is a system error, and today we’re going to show you how to fix it on Windows 10.

you must first add the web site to your trusted sites list [FIX]

Fix – ERROR_FORMS_AUTH_REQUIRED

Solution 1 – Authenticate to Office 365

According to users, this problem occurs when using SharePoint Online with Office 365. Once you map a network drive to SharePoint, you have to occasionally connect to SharePoint Online website. To do that, follow these steps:

  1. Use Internet Explorer to sign in to SharePoint Online site. Be sure to use your Office 365 login details.
  2. Once you enter your login information, check Keep me signed in option and click on Sign in button.

We have to mention that it’s crucial to check Keep me signed in option in order to fix this error. If you didn’t select this option, you need to sign out and sign back in again. To do that, do the following:

  1. In the Office 365 ribbon, click the arrow next to your name and choose Sign out.
  2. Close all open browser windows.
  3. Navigate to Office 365 portal.
  4. Enter your login information, check Keep me signed in option and click Sign in.

After signing in with your Office account, open a document library in Explorer View and try to access the mapped network drive.

Solution 2 – Add your SharePoint Online sites to Trusted sites

If you’re getting this error message, you might be able to fix it simply by adding your SharePoint Online URLs to the Trusted sites zone. This is rather simple and you can do it by following these steps:

  1. Press Windows Key + S and enter internet options. Choose Internet Options from the menu.
  2. Once Internet Properties window opens, navigate to Security tab and click on Trusted sites. Now click the Sites button.
  3. Enter the URL of your SharePoint websites in the Add this website to the zone section and click the Add button. Once you’re done, click Close and OK to save changes.
  4. Optional: Some users are recommending to uncheck Enable Protected Mode for Internet Zone, so you might want to try that as well.

After adding all your SharePoint websites to the trusted zone the error should be completely fixed.

Several users are suggesting to add the following entries to the Trusted zone:

  • https://*.outlook.com
  • https://*.sharepoint.com
  • https://*.microsoftonline.com
  • https://*.lync.com

In addition, you can also add the following entries to the Local zone:

  • *.microsoftonline.com
  • *.sharepoint.com
  • *.outlook.com
  • *.lync.com

Some users are also suggesting to sign in to your SharePoint website with Internet Explorer and check Keep me signed in option, so be sure to try that as well.

Solution 3 – Check the status of WebClient service

According to users, in order to prevent this error from appearing you need to keep the connection after you restart the computer. To do that, you need to make sure that WebClient service is running. To start this service, follow these steps:

  1. Press Windows Key + R and enter services.msc. Press Enter or click OK.
  2. Once the Services window opens, locate WebClient service. Check the Status of this service. If the Status isn’t set to Running, right click WebClient and choose Start from the menu.
  3. After starting this service, close the Services window.

Solution 4 – Install the latest updates

Sometimes Before opening files in this location, you must first add the web site to your trusted sites list message can appear if your system is out of date. Windows 10 has few bugs and glitches, but Microsoft is working hard to fix them through Windows updates. In most cases these updates are installed automatically in the background, but if you think that a certain update is missing, you can check for updates manually. To do so, follow these steps:

  1. Press Windows Key + I to open the Settings app.
  2. Once the Settings app opens, navigate to the Update & security section. Select Windows Update from the left pane and click on Check for updates button.

Windows will now check for any new updates. If updates are available, Windows will download and install them in the background. After updating Windows 10 to the latest version, check if the problem still persists.

Solution 5 – Use the correct path for the network drive

Several users reported this error while trying to map a network drive using File Explorer. According to them, they used the URL to the SharePoint website, and that caused this error to appear. If you have the same problem, you need to use the correct path to the network drive. If you don’t know the correct path, you can find it easily by using these steps:

  1. Open Office 365 and your project. Click on Open with Explorer icon. The icon is hidden in the ribbon, so you might have to search for it.
  2. Explorer window will now appear. Click the address bar and the location should change to example.sharepoint.com@SSLDavWWWRoot or something similar. Copy that path.
  3. Now try to map a network drive again, but be sure to use the same path from the previous step. In our example it was example.sharepoint.com@SSLDavWWWRoot, but it will be different on your PC.

After using the correct path, the problem should be fixed. This isn’t the best solution, and you’ll have to log in every time you restart your PC in order to access the network drive.

Solution 6 – Allow users to run custom scripts

If you’re getting this error message while using SharePoint, you should be able to fix it by changing few settings. To do that, follow these steps:

  1. Go to SharePoint Admin Center > Settings.
  2. Scroll down to the Custom Script area.
  3. Check Allow users to run custom script on personal sites and Allow users to run custom script on self-service created sites options.

After making these changes the problem should be resolved. Keep in mind that it might take 24 hours for these changes to apply.

Solution 7 – Delete Internet Explorer cache

Several users reported that you might be able to fix this problem by removing Internet Explorer cache. To do that, you need to follow these steps:

  1. Press Windows Key + S and enter internet explorer. Choose Internet Explorer from the list.
  2. Once Internet Explorer starts, click the gear icon in the top right corner and navigate to Safety > Delete browsing history.
  3. Delete Browsing History window will appear. Select Temporary Internet files, Cookies and website data and History from the menu. Click the Delete button to delete the cache.

After deleting the cache, restart your browser and check if the problem still persists.

Before opening files in this location, you must first add the web site to your trusted sites list message and ERROR_FORMS_AUTH_REQUIRED error can cause certain problems, but they are relatively easy to fix. Even though these are system errors, you can fix them easily by using one of our solutions.

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