Tbgaz,
Please share with us which model do you have on your branch office and on your HQ as well as Gaia OS versions installed.
What happens when you try yo test SIC from the management?
You can try to reset the tunnel but it seems that you will need someone on the other side to reboot it.
For next time set up a backup entry on your branch office firewall like a remote VPN o allowing only some IPs (Such as the one from your HQ) to access it via the public IP.
___
____________
https://www.linkedin.com/in/federicomeiners/