When something does not work

Reader or card is missing

Reconnect the reader, check the adapter and reinsert the card. Try a direct connection rather than a hub. Confirm the operating system recognizes your reader. Desktop apps may offer a configurable insertion helper.

Incorrect PIN

Stop and check which card is selected. Do not repeatedly guess: the card can lock after incorrect attempts. A blocked card requires help from the official card provider.

Browser connection is unavailable

Another signing application may already own the local connection port. Close the competing app, then reconnect using eSemnBun's browser settings. If the browser requests local-network permission, review it for the site you intend to use.

Report a problem

Include your app and OS versions, reader model, and steps to reproduce. Use fictional documents for examples. Do not attach PINs, identity-card photographs, private keys or confidential files. Visit Support.