This is the 2nd time that this has happened. I am unable to log in my SA540 as any user including the Admin either through the SSL VPN portal or directly connected to the box. The fix is to reboot the device and it starts working but I as I am not on-site all the time, this is a problem. I recently upgraded the firmware to 1.1.65.
Has anyone else experienced this issue and if so, how can it be resolved?