I have been using Teltoinika products for years, we went from using RUT950 to RUT955 and never had a problem untill now.
All of our routers have a public IP address and we open HTTP access to port 8080 so we can access the routers remotly.
We have had a few routers where we cant access the webpage of the router remotly, but when we do a port check the ports are open.
i have tried upgrading to the latest firmware but still no joy. we are using version - RUT9XX_R_00.06.08.5
i have tired other verisons but no joy.