CA UIM Discovery Wizard "Unable to acquire version information."

Document ID : KB000072549
Last Modified Date : 03/07/2018
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When launching the discovery wizard for one of the secondary hub with discovery agent, it pops up "Unable to acquire version information. Please check discovery agent and try again" since upgrading from 8.5.1 to service pack 1.
The Primary Hub to Secondary Hubs are tunnel hubs and it is opened Robot firewall port range 48000 - 48050 between the hubs.

If secondary hub and primary hub are talking over tunnel, UMP needs to access to tunnel-proxy-port (in the primary hub). 

Here is example.

Primary hub - tunnel server - Secondary hub - tunnel client - hub GUI of the primary hub - [hubs] tab. 
2.check [source] column for secondary hub. should look like 

In this scenario, UMP robot needs access 48050 port in