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page Remember that the le name is different from the display name By default, the display name is the le name To modify the display name, click on any data connection le entry in the CMCL and select Edit Properties The urn parameter tells the GetDataConnectionFileaspx Web page which form template to use Only administrator-deployed templates are considered possible matches For a form template to reference and use a CMCL data connection, it must have been deployed by the administrator (This fact is made clear in the Publishing Wizard when such a connection exists) At least one form template must use the UDC le being requested for GetDataConnectionFileaspx to succeed A CMCL-based data connection that is not used by any templates can never be retrieved through this Web page The last parameter used by the GetDataConnectionFileaspx Web page is version The value of version (which looks something like 1005) corresponds with the version of the form template as provided by the urn parameter Why is the version parameter necessary Multiple versions of a form template can exist simultaneously on the farm For example, earlier we talked about upgrading form templates An option labeled Allow existing browser-based form lling sessions to complete using the current version of the form template can be used when uploading a form template While some users are still lling out the old form template, others may already be lling out the new one A CMCL-de ned data connection could potentially be in use by one version of the form template but not the other It makes sense to permit access to a CMCL le if and only if a speci c version of a form template references that server connection le
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Authentication Considerations The server introduces new problems in data connection authentication This was never a problem with InfoPath Since InfoPath runs on every user s computer as his or her account, the person making the connection was always that user Running a data connection in InfoPath is a one-hop scenario with credentials propagating directly from the InfoPath program to an external server With Forms Services and SharePoint Server, authentication works a bit differently Instead of one hop from the InfoPath program running on the user s computer to the data source, as shown in Figure 1729, there is a two-hop process with Forms Services The rst hop is from the
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Figure 1729: Passing NTLM credentials for data connections with InfoPath and Forms Services
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Web browser to the server running Forms Services, and the second hop is from the server to the data source Since NTLM authentication (a protocol of Windows Integrated authentication) tokens can be used only on a single hop, the hop from the server to the data source cannot forward the authentication token As a result, the data source will see the data connection request as if it were from an anonymous user
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As you can see, it is not possible to authenticate yourself across more than one computer using the default authentication of NTLM You can mitigate this problem by using another authentication technology such as basic, digest, Kerberos, or SSO But instead of hassling with implementing a new authentication scheme across the board, consider keeping NTLM Thanks to a special feature provided by server-de ned UDCs, we can pass our NTLM token across the second computer boundary to a data source Every data connection converted to a server-based UDC will have a commented-out authentication block To see this block, open any UDC le in your favorite text editor Because it s commented out, the authentication block isn t doing anything useful This authentication block merely exists
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as a convenience should you want to pass credentials (to mitigate the twohop limitation) to the data source:
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