Fix Eset Nod32 Error Code Ecp.20003

The Eset Nod32 error code Ecp.20003 usually pops up while activating or updating the ESET product installed on a computer.

Resolve Activation Failed Or Update Failed Error

First, make sure that you have downloaded the product file that is fully compatible with your device’s OS types.

Make sure that your computer is connected to a stable network.

Check if the activation key that you are using is valid.

Check if your internet protocol is causing the problem.

If you are using DNS Internet Protocol version 4, then change it to 8.8.8.8 or 8.8.4.4.

After changing the DNS value, try to activate the ESET product on your computer.

If the above steps do not help, try the other methods discussed below.

If you are facing this Eset Nod32 error code Ecp.20003 issue on your Windows computer, then try using the ESET SysInspector tool. ESET SysInspector is a free diagnostic tool for Windows OS. This tool will help you capture the details of your computer, such as running processes, registry content, startup items, and network connections.

Diagnostic Tool Is compatible with Windows 10, 8, Etc.

You can download the ESET SysInspector tool from the official site of ESET.
Install and run this diagnostic tool on your Windows computer.
If the error remains unresolved, check if the Windows firewall, router, or host files is blocking the activation process.
If so, make the required changes and then check if the issue is resolved.
If you encounter this error code while updating the product, reset the Firewall settings of ESET to defaults and then check if the Eset Nod32 error code Ecp.20003 is resolved.
To reset the firewall settings, follow the instructions given below.
Launch the ESET application on your computer.

Now, access the Advanced Setup section by pressing the F5 button on your computer’s keyboard.
Click the Network Protection tab followed by Firewall.
Click the Default icon.
Now, a dialog box titled Advanced setup- ESET Smart Security Premium will open. (based on your product type, the title may vary)
In the dialog box, click the Revert to default button.
Now, try to update the ESET NOD32 product.
If the error code persists, uninstall and reinstall the ESET product on your computer.
After uninstalling the ESET product, perform a fresh installation of it.