Fortigate 70D Internal network connectivity issues.
We have deployed more than 30 fortigates to many different clients (most of them are hotels/hospitality services) In all of our deployments we are using internal switch interface mode, we are creating hardware switch in which are included of 1 to 4 ports, with 4-10 vlans (depending of the customer's requirements). We always use one port of the hardware switch.
All of our deployments work fine except those that we have used FortiGate 70D (7-8 deployments) and here is the issue:
All of the internal networks, randomly, are losing internet connectivity and connectivity to other ports of fortigate.
We can Access fortigate from the internet through wan ports which still are active, and https/ssh management is active too. But we do not have access to none of the internal networks through the wan. Even if I ping any internal ip under GUI Cli console I do not get reply.
Connectivity is never being restored unless i disable and re-enable the internal physical port and then voilà! Internet connectivity and generally all the lost connectivity to the internal interface is restored!
(if I disable/enable just a vlan interface nothing happens).
All of the access/core switches that we are using are HP/HP procurve/Aruba switches and many models too.
Things we have tried:
- used different interfaces of the fortigate
- used differernt models of access/core switches
- tried tagged/untagged on the physical interface of access/core switch
- STP different configs under FGT and access/core switches
- Changed the link speed from 1gbps to 100mbps of the internal network (disaster)
- Created 2 tickets in support.fortinet.com portal
This problem happens ONLY to 70D's... :(
No luck so far... I'm considering of replacing all of them with FortiGate 80E or 90E or 60E
You are my last hope...!