[GenieACS] ACS server can ping to CPE, but not refresh and return an error "Device Offline"

[Lê Văn Vượng]

Hi Friends,
I'm using GenieACS to management router Virgo (model 2912n), some devices can not refresh and return an error "Device Offline".
Note: In CPE device, i was configure Periodic Inform to CPE send message to ACS after 60 second.

Any ideas to fix that are appreciated?
Thanks so much!

Best Regards,
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Vuong, Le Van (Mr.)
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