I have a Pi5 Sixfab CORE setup and working with interfaces wlan0 and usb0 in that order.
When I disable the SIM, I can still connect via SSH but can not thru RealVNC until I reboot. Is this the correct behavior? Can it be resolved short of rebooting?
Also, this pi shows 2 red Xs in the tack bar when hovered over say “Connection the dhcpcd lost” – this is normal with CORE?
Thanks
Hi,
When the SIM is disabled, there might be a configuration that gives the usb0 interface (cellular interface) higher priority over wlan0 . If RealVNC is tied to this interface for its connections, it might be trying to continue using the disconnected interface (usb0), rather than switching over to wlan0 . If usb0 has a higher priority for routing than wlan0, you can manually set interface priority.
Make sure RealVNC is explicitly bound to the wlan0 interface. You can check and adjust the VNC server settings to prefer specific interfaces if necessary.
The error message “Connection to dhcpcd lost” indicates that the DHCP client (dhcpcd ) responsible for managing network connections may be losing track of interface status changes, especially when switching between the cellular connection (usb0 ) and Wi-Fi (wlan0 ).
Instead of rebooting, you can try restarting the networking service, which should reset the interface status without requiring a full reboot:
sudo systemctl restart dhcpcd
This might resolve the issue with RealVNC not connecting after the SIM is disabled.