Digital Signature Errors

When a user trying to register Digital Signature Certificate (DSC) on Income Tax e-filing Website, the error displayed "The PAN mentioned in the Digital Signature Certificate does not match. Please retry" or as shown in following image:- Solution: 1. In case you are using Digital Signature Certif

Query:- While registering a DSC, the message 'The Digital Signature Certificate is already registered' is displayed. What should be my course of action? Answer:- A DSC cannot be registered by multiple users. The error message might mean that the DSC is already registered against another taxpayer.