Forticlient WWAN Issues

[jwr5184]

Hello,

I am currently attempting a deployment for new Windows 11 PCs; these machines are equipped with Sierra Wireless EM7511 WWAN cards / modems using AT&T physical SIMs. Our deployment requires a split tunnel, using both Netmotion NetMobility Client and Forticlient VPN simultaneously.

Over the past weeks we have had nothing but issues, both Windows 11 and Windows 10 based machines (same physical hardware) BSOD / BugCheck a short time after connecting via FortiClient. Initially we were concerned that this could be a Sierra Wireless issue, so as a temporary solution we tested USB modems. These modems perform well until the machines are connected to Forticlient; Once connected within 30s - 5 minutes the USB modem will restart / disconnect albeit no BSOD. This behavior is repeatable and occurs only when Forticlient is connected regardless if NetMobility is connected or disabled. It appears that for some reason when Forticlient is active it causes modems, whether USB or internal, to restart and/or panic.

Forticlient Version: 7.4.1658

Panasonic FZ-55 Mk3

Sierra Wireless EM7511 OR Netgear 340U

Any help or suggestions are appreciated. 

[AEK]

Hello Jwr

Try search for anything relevant in FortiClient logs and in Windows events. Some relevant logs that happens at the same time the modem restarts.