I'd start checking in order:
- Is the OS where you are deploying ump supported?
- Is there any Antivirus running?
- Can you double click on the controller of that ump robot and access the GUI?
- Is firwewall/iptables/SELinux allowing bidirectional communication between hub and robot?
Rules to be enabled on all systems running a robot:
1. Allow INBOUND TCP 48000 to 48099
Additionally on all robots that are also running hubs allow:
2. Allow OUTBOUND TCP 48000 to 48003
3. Allow OUTBOUND UDP 48000 to 48003
4. Allow INBOUND UDP 48000 to 48003