Users are repeatedly prompted to sign in even though they have successfully signed in previously when they use the Firefox or Chrome web browser.
This issue occurs when the following conditions are true:
· The web browser is connecting to a Microsoft Dynamics CRM Server that uses AD FS 2.0 for claims-based authentication. Claims-based authentication is required for an Internet-facing deployment (IFD).
· The web browser that used to access Microsoft Dynamics CRM 2011 is Firefox or Chrome.
This issue occurs because of the Windows operating system feature Extended Protection for Authentication. For more information about this security feature, see Microsoft Security Advisory (973811).
The following steps disable Extended Protection for Authentication. This feature can help reduce the risk for “man in the middle” kinds of attacks. For more information about this feature and the protection it provides for credential handling see Microsoft Security Advisory (973811).
The following steps disable the Extended Protection for Authentication feature on the computer running Firefox or Chrome.
1. On the computer where the web browser is experiencing the issue, start Registry Editor (regedit), and locate the following subkey. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa
2. In the Lsa subkey, locate the SuppressExtendedProtection value. If the value does not exist, you must add it. To add the value, right-click Lsa, point to New, and then click DWORD (32-bit) Value. Type SuppressExtendedProtection, and then press ENTER.
3. Right-click SuppressExtendedProtection, click Modify, and enter 1 (REG_DWORD).
4. Click OK and close Registry Editor.
5. Repeat for each computer that experiences the issue when you run Firefox or Chrome and Microsoft Dynamics CRM.
After the change is made, the following behavior occurs.
· Chrome web browsers will no longer continue to prompt after the initial sign in.
· Firefox web browsers will prompt up to two additional occasions after the initial sign in.
Cross browser support for Mozilla Firefox and Google Chrome was introduced in Update Rollup 12 for Microsoft Dynamics CRM 2011. Prior versions of Microsoft Dynamics CRM 2011 do not support cross browser platforms.
Mozilla Firefox users may also experience a prompt for credentials when using Windows Integrated Authentication. For more information regarding this symptom, please see the following article: