Suspended Workflow in SharePoint 2013 with HTTP 401 Error!

Question

I have a list workflow which starts automatically when creating an item to generate a serial number. But when any user create
a new item, the workflow suspend with the following details, and only the users with "Full Control" permissions can make the workflow work:
RequestorId: eda26c74-95ef-2733-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow
instance. Exception details: System.ApplicationException: HTTP 401 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["1"],"SPClientServiceRequestDuration":["88"],"SPRequestGuid":["eda26c74-95ef-2733-87b9-028d0512861d"],"request-id":["eda26c74-95ef-2733-87b9-028d0512861d"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"Cache-Control":["max-age=0,
private"],"Server":["Microsoft-IIS\/8.0"],"WWW-Authenticate":["NTLM","Basic realm=\"sp.contoso.com\""],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"],"MicrosoftSharePointTeamServices":["15.0.0.4420"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1;
RequireReadOnly"],"Date":["Sun, 27 Apr 2014 11:13:07 GMT"]} at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance
instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

Answer 1

Hi AmrHanmam,
According to your description, my understanding is that SharePoint 2013 workflow suspend with 401 error.
For resolving your issue , please do as the followings:
Be sure User profile synchronization is started.
The user by whom you are logged is available in User Profile list.
Final step full synchronization of User Profile Application.
Here is a similar post for your reference:
http://social.technet.microsoft.com/Forums/en-US/8671e31e-fde2-454c-aba4-0fc6484dd873/sharepoint-2013-workflow-suspend-with-401-error?forum=sharepointcustomization
In addition, there is another reason for this issue, please take a look at:
http://support.microsoft.com/kb/2839070/en-us
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support