Rockwell Automation FactoryTalk Historian SE ActiveView 3.2 User Guide - Manual (Page 87)

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Troubleshooting
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For instructions on setting the expiration timer, see Expiration of Displays
(page 34).
Using ActiveView with Windows 2003
Windows 2003 is shipped with higher security than its predecessors. Not
all file types are served to clients by IIS. By default, *.HTM files are
considered safe but *.PDI files are not.
Therefore you may see error messages when running ActiveView from the
client machine, even though the NTFS permissions are the same on the
HTML and the PDI files.
To fix this, add a MIME type to the IIS for the site directories from which
ActiveView opens the PDI file. MIME types can be defined globally for
IIS, and additional MIME types can be defined at the Web site, Web site
directory, and Web site virtual directory level.
To add .PDI files as "ok to serve:"
1. In IIS Manager, right-click the level of hierarchy for which to change
the setting and select Properties.
2. Go to the tab HTTP Headers and click the MIME Types button.
3. Select New and type the following information
 for Extension: .PDI.
 for MIME type: application/octet-stream.
4. You should now see the .PDI under the Registered MIME Types list.
5. Click OK.
6. Stop and restart your IIS service for the changes to take effect.