Are you using the Turbotax Online (DIY) or TurboTax (Desktop) version? At what point are you experiencing this error? 

I am using turbo tax desktop. I get this error when transmitting  (net filing) the file.

We can try a few troubleshooting steps to resolve this issue.

Reset your modem. It can sometimes be beneficial. Try connecting your computer temporarily to your phone's mobile hotspot.

• Windows frequently prevents tax software from "talking" to the internet unless it has full permissions.
• Close TurboTax entirely.
• Right-click the TurboTax 2025 icon on the desktop.
• Select "Run as an administrator."
• Try it again to Netfile.

Disable the firewall or VPN for the time being and enable it afterwards.