How to remove error System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.

Hi All

We are trying to change the SMTP server through Email configuration router But at the time of clicking "Modify" button, the following error is coming and we are not able to change the name of SMTP server.

System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.

Any inputs are appreciated.

thanks in advance