I have quite a common CSOM provider hosted app. (On Premise, HighTrust) Inside this app I use the infamous
using (var clientContext=GetContext()) {
...
clientContext.ExecuteQuery();
}
(I can provide more code if needed, but as this works in most browsers this should not be a code issue)
On the dev machine, everything works fine (any browser). At the customer, Chrome works and Firefox works. But the Internet Explorer (9 and 11) throw a 401 error:
System.Net.WebException: The remote server returned an error: (401) Unauthorized.\r\n at System.Net.HttpWebRequest.GetResponse() at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute() at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuildersb) at Microsoft.SharePoint.Client.ClientContextExtensions.ExecuteQueryImplementation(ClientRuntimeContext clientContext, Int32 retryCount, Int32 delay)
What could be the problem?
