Fortinet Upgrade to 5.6.1 lossing GUI Access

Hello All,

Has anyone faced issue while upgrading Fortinet firewall from 5.6.0 to next version , we have Aggregation Interfaces serving as our management interface LAN  for firewall and post upgrade to 5.6.1 the Interfaces stops responding to management protocols HTTP , HTTPS  , SSH and even ICMP . Has anyone faced such issue .