Asset Explorer Problem

Asset Explorer Problem

Hello Team,

I am using ManageEngine Service Desk Plus 10.5 Build 10500. for Asset management we use Asset Explorer to manage our assets after installing the ME Asset explorer agent to all the windows devices when i click " Scan now " button and try to scan the devices it gives me an error :  

FAILURE :Timeout in agent communication.     

i did some basic troubleshooting : 
-      Network speed is 40 Gig / sec so its not slow 
-       Connectivity from server to client is fine, i did telnet with port 9000 ( that we are using on agent ) and it is established. 
-      the clients are ping able 
-      from our firewall there is no blockage between server and client.

Its only working on 3 computers but its not working on rest of the 60 computers , and no difference between these computers all settings are same. 

Thank you, really looking forward for your help. 

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