AIR does not work after NBU appliance upgrade

Hi, recently we helped a customer to upgrade two NBU 5230 appliance from 2.5.4 to 2.6.0.3. Before the upgrade, the AIR between the two appliance (one in prod site and one in DR site) is working fine. However, after upgrade, we can see AIR job run in the appliance in prod site. However, we cannot see any import job in the appliance in the DR site. 

My quesiton is: do I need to reset the AIR after upgrade? If no, how to troubleshoot in this case. Thanks in advance.