|Product version:||EPiServer CMO 2 on EPiServer CMS 6 / 6 R2|
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There is a known issue when login screen thumbnails are displayed for page variations in A/B test reports instead of screenshots of page versions. The thumbnail service is working under the standard LocalSystem account and you cannot login to a CMS website to generate thumbnails on unpublished pages; instead snapshots of the login screen are generated.
The root of the problem is changes in the security system of the Windows Server 2008 R2. Now, it is essential for a user to log in at least once, because some folders and security tokens are created only at the first login.
As the LocalSystem is a “virtual” user and cannot be used for logging in, it does not have all that stuff and there is no way to acquire it. Therefore, it has no place to store a cookie used by the Thumbnail service for authorization to the site and we see the login screen when it is running under the LocalSystem account.
The solution is to configure a special user account for the Thumbnail service, as follows:
This fix can only be applied to the websites hosted with Windows Server 2008 R2 and later versions of Windows Server.