Symptoms
When navigate to Management console, the workflow server node disappear in all client PC. However, it works find when launching K2 Workspace within the server itself.
Diagnoses
There isn't any errors from the client script execution or within HostServer logs.
Resolution
Apparently it's a posting issue with IE in non-NTLM authenticated website. We found the solution from this Microsoft KB:-
https://support.microsoft.com/en-us/kb/251404
