Connection troubleshooting
Unable to establish LTE connection after upgrading to FOS 6.2.5
A backward compatibility issue was discovered in FOS 6.2.4 when the latest FortiGate LTE variant models such as 40F-
3G4G were introduced. It could render all older 30E LTE models unable to connect. This issue has been patched in
6.2.5 but we highly recommenced that you stay at FOS6.2.3 until the FOS 6.2.6 release, which is much more stable.
“diagnose lte-modem sim-info” shows erroneous information
This issue exists in FOS 6.2.4, 6.2.5, 6.4.2 on LTE models with dual SIM slot (40F, 60F, 80F and etc) only.
When issuing the "diagnose lte-modem sim-info” command, you may see SIMcard information flipping
between slot 1 and 2 back and forth, with no LTE connection despite that fact that valid SIM cards are inserted. It
started with the default connectivity-based hot swap feature which enables FOS to switch to use the other slot if the
current slot (even with a SIM card inserted) is unable to connect for a certain period of time. However, for some carriers,
it would take longer to connect than the current waiting period, causing FOS to force-switch to the other slot before the
modem has a chance to establish a connection. This issue will be patched in 6.2.6. The current workaround is to
manually disable connectivity-based hot swap using the following command:
config system lte-modem
set connection-auto-switch disable
end
This ensures that FOS will do hot swapping only based on SIM card presence. You could then insert the SIM card into
the slot that FOS is currently monitoring. Or you could use the “set sim-slot” command to set the SIM slot for
FOS to use.
l
The "connection-auto-switch” option will be hidden if the “sim-auto-
switch” option is not ENABLED.
l
The “sim-slot” option will be hidden if the “sim-auto-switch” option is not
DISABLED.
“diagnose lte-modem sim-info” shows mixed SIM card info
The “diagnose lte-modem sim-info” command sometimes may return mixed SIM card info with some fields
belonging to SIM card1 and others related to SIM card2. This is because it takes some time to get SIM card information
updated in FOS and the display is lagging behind. It may take a few seconds to for the system to display the correct
information after the SIM cards are inserted.
Carrier-provided SIM cards unable to establish LTE connection
Some customers may find their units unable to establish an LTE connection with Fortinet-supported SIM cards from
their carrier. This is because currently FGT-3G4G units are preloaded with LTE modem firmware for the following carrier
(this information can be obtained using “diagnose test app lted 17”):
l ATT
l DOCOMO
l VERIZON
l SOFTBANK
FortiGate-FortiWiFi 5.0 3G4G LTE Modem Operator's Manual 61
Fortinet Technologies Inc.
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