A simple Windows Forms based tool for testing a connection to a K2 Workflow REST API endpoint using OAuth configuration values specified. Because these connections can often be tested from any remote client, there should be no opposition to running the executable. 

Errors are caught on a high level and displayed in a message box:
 

NOTE: The tool can only be used to test against the workflows API - i.e. https://{your K2 URL}/api/workflow/v1/workflows