Map Network Drive Error (Solved)

Unable to connect to or Map Network Drives (O365).

Access Denied. Before opening files in this location, you must first add the web site to your trusted sites list, browse to the web site, and select the option to login automatically.

Symptoms: “Access Denied. Before opening files in this location, you must first add the web site to your tusted sites list, browse to the web site, and select the option to login automatically.”

For example, a user receives the error message in the following scenario:

  1. When a user tries to access a mapped SharePoint Online Document library/site from the computer.
  2. When a user is trying to map a SharePoint Online Document library to the computer.

Cause: This error occurs because the SharePoint Online sites are not added to the trusted sites.

Resolution:

Application Layer (Internet Explorer):

  • Internet Explorer > Internet Options > Security > Trusted Sites (tab) > add the SharePoint Online Site collection to it (include https://)
  • Internet Explorer > Internet Options > Security > Trusted Sites (tab) > add https://*.sharepoint.com
  • Internet Explorer > Internet Options > Security > Trusted Sites (tab) > Custom Level > automatic logon with current username and password
  • Require server verification (https:) for all sites in this zone should be checked
  • Internet Explorer > Internet Options > Security > Local Intranet (tab) > Advanced > add the SharePoint Online site without https://
  • Internet Explorer > Internet Options > Security > Trusted Sites (tab) > add *.sharepoint.com
  • Internet Explorer > Internet Options > Security > Local Intranet (tab > Custom Level > automatic logon with current username and password
  • Require server verification (https:) for all sites in this zone should be NOT be checked
  • Internet Explorer > Compatibility View Settings > add sharepoint.com

Presentation Layer (Operating System (Windows)):