Troubleshooting Tip: FortiSwitch firmware upgrade stuck at 0% from FortiGate GUI

[mle2802]

Description	This article describes a solution for the problem with FortiSwitch stuck at 0% when upgrading from FortiGate GUI.
Scope	FortiGate and FortiSwitch.
Solution	When trying to upgrade FortiSwitch firmware under Wifi & Switch Controller -> Managed FortiSwitches, it stuck at 0% without any errors.  Checking connectivity between FortiGate and FortiSwitch using SSH and getting 'No route to host' error: Demon # exec ssh admin@192.168.16.5 ssh: connect to host 192.168.16.5 port 22: No route to host This indicates a connectivity issue between FortiGate and FortiSwitch. Check the following items to make sure the connection is good: Checking routing-table using the command 'get router info routing-table database' to make sure the connected route is via the FortiLink interface. Demon # get router info routing-table details 192.168.16.5 Routing table for VRF=0 Routing entry for 192.168.16.0/28 Known via "connected", distance 0, metric 0, best * is directly connected, fortilink Checking the ARP table using the command 'get sys arp'. Demon # get system arp Address Age(min) Hardware Addr Interface 192.168.16.5 0 80:80:2c:ac:45:74 fortilink