I want to view my Sharepoint documnets in salesforce using "File Connect" introduced in Winter15 release for connecting to External Data source but i am facing a problem to connect to sharepoint. I have used the follwing link for Set Up Salesforce Files Connect :

http://releasenotes.docs.salesforce.com/en-us/api_cti/release-notes/rn_chatter_files_connect_setup.htm and followed the steps below :

  1) First, enable Files Connect, and let users access related
    external data sources

  a) Enable Files Connect for your organization.

  b) Let users access Files Connect data sources.

  2) For cloud-based data sources, create an authentication provider, and then define the source

 a) Create a SharePoint Online authentication provider.

 b) Define a SharePoint Online external data source for Files Connect.

But when completing the step2 b) and clicking on Start Authentication Flow on Save as checked and saving it takes me to sharepoint login page and when logged in to sharepoint following error occurs:

The query String "redirect_uri" is missing or invalid



I have checked lots of sites but unable to correct fix this issue.If anyone has knowledge please,please share it with me as soon as possible .

We are trying to enable the File connect feature and access the SharePoint file from the upcoming feature in my sandbox and we are facing some problem,In the mentioned URL "https://help.salesforce.com/HTViewHelpDoc?id=external_secure_agent.htm".
1) We are Not able to found "Modify Secure Agents" permission in profile.
2) We are also Not able to found "Secure Agents" in the side bar. 

We are trying to enable the File connect feature and access the SharePoint file from the upcoming feature in my sandbox and we are facing some problem,In the mentioned URL "https://help.salesforce.com/HTViewHelpDoc?id=external_secure_agent.htm".
1) We are Not able to found "Modify Secure Agents" permission in profile.
2) We are also Not able to found "Secure Agents" in the side bar.