DUO: "Trust this Browser" setting is not working, or the box is grayed out.

Duo two-step "Trust this Browser" feature is not working. You may be receiving an error message when you try to select "Trust this Browser" or may be receiving the two-step login prompt repeatedly, despite selecting this option.


The "Trust this Browser" feature for Duo two-step login relies upon your web browser's saved cookies. If you have already selected the "Trust this Browser" option on your web browser, but still keep getting prompted to perform two-step verification each time, this usually indicates that your web browser is blocking third-party cookies such as Duo Security.


If the "Trust this Browser" feature is not working, follow these steps to add an exception to allow third-party cookies from Duo Security:


  1. Open Chrome and select More (three vertical dots) in the top-right, then select Settings.
  2. Scroll down to the bottom and select Advanced.
  3. Locate the "Privacy and security" section and select Content settings Cookies.
  4. Next to Allow, select Add.
  5. Enter the following: [*.]duosecurity.com
  6. Click Add.
  7. You may need to restart your browser for changes to take effect.


  1. Open Chrome and select Menu (three horizontal lines) in the top-right, then select Preferences.
  2. Select Privacy & Security tab.
  3. In the "Cookies and Site Data" section, click Manage Permissions...
  4. Enter the following: https://duosecurity.com
  5. Select Allow, then Save Changes.
  6. You may need to restart your browser for changes to take effect.

Edge/Internet Explorer 

  1. Open Edge/Internet Explorer and select the Tools (gear icon).
  2. Select Internet options.
  3. Select Privacy tab.  
  4. Under "Settings", select Sites.
  5. Enter the following: *.duosecurity.com 
  6. Now select Allow to allow Duo Security to use cookies.  Click Ok to confirm.
  7. Click Ok.
  8. You may need to restart your browser for changes to take effect.


Safari does not have an option to add individual exceptions for sites.  You will need to enable third-party cookies on Safari to allow Duo Security to remember your two-step login:

  1. Select the Safari drop-down menu from the top menu bar.
  2. Select Preferences...
  3. Click Privacy tab.
  4. Make sure that "Block all cookies" is unchecked or set to Never.
  5. You may need to restart your browser for changes to take effect.
  6. Safari 13.1 and later: You must also disable the Prevent cross-site tracking option.

If your browser is not listed, please consult your web browser's support pages for allowing third-party cookies.

For more information, please see the following Duo support article.

Help Desk logo
Need support? Contact helpdesk@plu.edu, (253) 535-7525, or submit a Help Desk ticket.

KeywordsDuo, Trust, Browser, grayed   Doc ID127517
OwnerLee T.GroupPacific Lutheran Univ
Created2023-04-28 08:09:38Updated2023-06-14 09:05:54
SitesPacific Lutheran University
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