I tried restarting the spectrumgtw probe and then the hub and still the spectrumgtw probe comes ui as red in IM. Logs show several errors indicating issues communicating with UIM:
May 01 2019 07:34:02,610 [twScheduler_Worker-7] ERROR HeartBeatRestImpl - NAS/EMS or Spectrum is down stopping the schedulers .. NAS/EMS down : true Spectrum down : false
May 01 2019 07:34:12,166 [main] INFO com.nimsoft.nimbus.NimProbeBase - subscribe to queue alarm failed ((80) Session error, Unable to open a client session for 10.139.28.20:48002: Connection refused: connect), trying subscribe to subject udm_inventory
And then max restarts is reached:
May 1 07:51:13:911 [11624] Controller: Max. restarts reached for probe 'spectrumgtw' (command = <startup java>)
Release : 8.51 SP1
Component : UNIFIED INFRASTRUCTURE MGMT
Spectrumgtw 8.6.5 HF 10