Outlook continually prompts for your password when y'all attempt to connect to Function 365

  • Article
  • iv minutes to read
  • Applies to:
    Outlook 2013, Outlook 2010, Function Outlook 2007, Exchange Online

Symptoms

When you try to create an Outlook profile or connect to a Microsoft Office 365 mailbox, you lot're continually prompted for credentials while the client displays a "trying to connect..." message. If you cancel the credentials prompt, you receive the following mistake message:

The connectedness to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

Cause

This issue tin can occur if the Logon network security setting on the Security tab of the Microsoft Exchange dialog box is set to a value other than Anonymous Hallmark.

Screenshot of the Security tab of the Microsoft Exchange dialog box, checking if the Logon network security setting is set to Anonymous Authentication.

Resolution

Note

Microsoft Outlook 2016 and some recent builds of Outlook 2013 are not afflicted by this effect. Those versions take been updated to prevent the trouble that is described in the "Symptoms" section. These versions have the Logon network security setting disabled or removed from the Microsoft Commutation e-mail account settings.

For newer versions of Outlook

Run a cocky-diagnostics tool

You lot may be an Function 365 customer who is experiencing the error that is described in the "Symptoms" section when you lot effort to connect to an Commutation Online mailbox. You may too already be running newer versions of Outlook 2013 or Outlook 2016. If both conditions are true, you can run diagnostics to determine the upshot that might cause the error. The diagnostics will perform automated checks and provide possible solutions to fix the detected issue. Select Diag: Outlook keeps asking for my password to launch the diagnostic.

If y'all are connecting to an Substitution On-Premises mailbox, meet the following articles for boosted troubleshooting:

  • Outlook prompts for password when Modernistic Authentication is enabled

Additionally, y'all can view the following forum thread for common causes:

  • Why does Outlook keep prompting for countersign

For affected versions of Outlook

If you take an older version of Outlook, change the Logon network security setting to Anonymous Authentication to fix this issue. To practise this, follow these steps:

  1. Exit Outlook.

  2. Open up Control Panel, and then do one of the following:

    • In Windows 10, Windows viii.ane, or Windows 7, click Get-go, type command panel in the search box, and then press Enter.
    • In Windows eight, swipe in from the right side to open the charms, tap or click Search, and then type control panel in the search box. Or, type control console at the Start screen, and then tap or click Control Panel in the search results.

  3. In Control Panel, locate and double-click Postal service.

  4. Click Bear witness Profiles, select your Outlook profile, and then click Backdrop.

  5. Click E-mail Accounts.

  6. Select your email account, and then click Alter.

  7. In the Change Business relationship dialog box, click More Settings.

  8. In the Microsoft Exchange dialog box, select the Security tab.

  9. On the Logon network security list, select Anonymous Authentication, and then click OK.

  10. Click Next, click Finish, and then click Shut on the Account Settings dialog box.

  11. Click Close on the Mail Setup dialog box, and and then click OK to close the Mail control console.

More data

To locate and view the registry setting for Anonymous Authentication in the Outlook profile, follow these steps.

Important

Modifying the Outlook profile past using the "Profiles" registry path is non supported and may cause your Outlook profile to exist in an unsupported state. Follow the steps in this section carefully. Serious problems might occur if y'all modify the registry incorrectly. Before you admission information technology, dorsum up the registry for restoration in case problems occur.

  1. Open the Registry Editor.

    • In Windows 10, Windows 8.i, or Windows 8, press the Windows logo cardinal+R to open the Run dialog box, type regedit.exe, and and so click OK.
    • In Windows seven, click Get-go, type regedit in the Get-go Search box, and so press Enter. If you're prompted for an administrator password or for confirmation, blazon the countersign, or click Allow.

  2. Locate the registry path advisable for your version of Outlook:

    • For Outlook 2013

      HKEY_CURRENT_USER\Software\Microsoft\Office\fifteen.0\Outlook\Profiles

    • For Outlook 2010 and 2007

      HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles

  3. Under this subkey, locate and aggrandize the name of your Outlook profile.

  4. Under the profile, locate and expand the 9375CFF0413111d3B88A00104B2A6676 key.

  5. Under the 9375CFF0413111d3B88A00104B2A6676 primal, you come across a subkey for each account in your profile. Select the first subfolder (00000001), and and then examine the data of the Account Name binary value by double-clicking the value. Echo this process until you find the Account Proper name value that includes your SMTP address. For instance, the Account Name value points to guidopica@contoso.com nether the \00000003 subkey.

  6. Under the \0000000x subkey, locate the Service UID binary value. It represents a GUID (for example, c3 d1 9a 7b eighty 1b c4 4a 96 0a e5 b6 3b f9 7c 7e).

  7. Locate the subfolder in your profile that matches the GUID value identified in footstep half-dozen (for instance, \c3d19a7b801bc44a960ae5b63bf97c7e).

  8. Under the subfolder that you found in pace 7, examine the 01023d0d binary value. It represents a GUID (for example, 5f cf d5 f1 ba 5c 6f 45 b3 57 cc 5e 0d 16 94 58).

  9. Locate the subfolder in your profile that matches the GUID value identified in step 8 (for example, \5fcfd5f1ba5c6f45b357cc5e0d169458).

  10. Nether the subkey institute in step 9, examine the value of the 00036619 binary value. This value determines whether Outlook is using Anonymous Authentication.

    Binary: 00036619

    Information: 01 f0 00 fourscore == Bearding Authentication

    Any other value represents an authentication method other than Anonymous.

    Screenshot of the Security tab of the Microsoft Exchange dialog box, checking the value of the 00036619 binary value.