Hi,

Can you try running the following powershell scripts in a SharePoint Management Shell? Check if you have any event receiver on that list that correspond to the item added event.

$spWeb = Get-SPWeb -Identity http://server
$spList = $spWeb.Lists["My List Name"]
$spList.EventReceivers | Select Name,Assembly,Type

In order for a list or library to automatically start a workflow, it should require a corresponding event receiver. If there are no event receiver bound to the list that can detect if item is added, the workflow will not get started.

Hi,

Were there any errors logged around the time you tried to trigger a workflow on item added? (K2Host ServerBinHostServeryyMMdd_x.log). Please also check that the user has start rights on the workflow. 

Hi,

Please see the following post (http://community.k2.com/t5/K2-blackpearl/SharePoint-2013-workflow-does-not-start-on-quot-Item-Added-quot/m-p/87733#M27269)

It sounds like the remote event receiver url is not getting accessiable from SharePoint side of thing.