One of the common problems which taxpayers are getting is the error message when filing the GST Return is “Failed to establish connection to the server – GST” for this the following solution can be tried

1. Uninstall the emsigner
2. Update the latest version from the GST portal
3. Check if your browser is up to date
4. Run the emsigner as administrator
5. Login into gst.gov.in and fill all the required information and go till update register DSC
6. Open a separate tab in the browser and type http://127.0.0.1:1585
7. Click on advanced
8. click to proceed 127.0.0.1(unsafe)
9. Go back to GST Portal and refresh the page
10. Click to register DSC

The above should be able to resolve the issue else please connect your DSC company representative for resolving the issue.