That is actually the Mobility Switch trying to reach out to Aruba Activate. If you aren't using it, you can use the following commands and that should disable the messages.
!
activate-service-firmware
no enable
!
While you're at it, you can also disable the aruba-central service which also tries to reach out to Aruba Central.
!
aruba-central
no enable
!
Its been a while since I thought of my old ISDN PRI days but in this instance it actually means PRIMARY.
Best regards,
Madani