Fix DSC (Digital Signature Certificate) Error in GST

By 99Digital Signature on Jul, 28 2025

GST emSigner error

• emSigner Not Started / Not Running
• Ensure emSigner is installed on your system. 
• Run emSigner as Administrator
• Right-click the emSigner shortcut → Run as Administrator
• Open http://127.0.0.1:1585 in your browser to verify it's running.
• Check that port 1585 or 2095 is not blocked by antivirus/firewall.

Digital Signature Certificate Not Detected

• Ensure the USB DSC token is properly inserted.
• Install the latest DSC drivers (e.g., Hyp2003, ProxKey, TrustKey).
• Use Internet Explorer (11) or Chrome with old security settings, as newer versions may restrict Java applets and plugins.
• Open emSigner and refresh the GST page before signing.
• Ensure your DSC is registered on the GST portal
• Log in to GST portal → Dashboard → Register/Update DSC
• Follow the registration process
• Check your DSC validity period
• Try a different USB port

Java Issues

• Install Java 8 (recommended version).
• Configure Java security settings to allow GST portal
• Clear Java cache.

Windows-Specific Fixes

• Use Windows 7/10 (64-bit), preferably.

• Browser Google Chrome
• Internet Explorer 11 (preferred for DSC)