Provider Hosted Site not able to query SP site for information

Question

Hi everyone,
This is the scenario. We have an application server (http://serv-wfm-app:102) not a part of the SharePoint farm that is hosting the website. It is a non-SharePoint server that communicates to a SharePoint site (http://onboarding and queries group membership
to see if the user is a part of that particular group. If the user is a part of the SharePoint group called "Admin" for instance it will show particular tabs. If they are not it will hide them. The code uses Client Object Model to query the group
membership information. The thing about this is that it works if I run a localhost debug session in Visual Studio. It detects the user and queries the SP site group membership successfully and hides the tabs based on if they a part of that group or not. However,
when run hosted on the http://serv-wfm-app:102 application server it will not hide the tabs and will not present with any error as well. Any ideas what the reason is for this? Here is a snippet of the code we are using.
using (var context = new ClientContext(_hostWebUrl))
GroupCollection siteGroups = context.Web.SiteGroups;
User user = context.Web.CurrentUser;
GroupCollection userGroups = user.Groups;
Group adminGrp = siteGroups.GetByName("Admin");
context.Load(adminGrp);
context.Load(user);
context.Load(siteGroups);
context.Load(userGroups);
context.ExecuteQuery();
foreach (Group group in userGroups)
//Checking the group
if (group.Title.Contains(groupName))
return true;

Answer 1

Hi,
Per my understanding, you might want to query information of a SharePoint site from an external server using Client Object Model.
As a common practice, I suggest you debug your code to see if all the objects in use hold proper value during the request.
Also, as the code will run on an external server, you will need to set the credential before requesting SharePoint resource:
https://msdn.microsoft.com/en-us/library/system.net.networkcredential.aspx?f=255&MSPPError=-2147217396
http://sharepointdragons.com/2012/04/20/authentication-when-using-the-sharepoint-client-object-model/
Thanks
Patrick Liang
TechNet Community Support
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