HP Ew2400 - JetDirect Print Server Administrator's Manual page 139

Printer Password Synchronization. Many EIO printers
provide password-protected access to printer configuration and
status settings. The password is set through security Web pages
provided by the printer. For these printers, the administrator
password for the printer and the Jetdirect EIO print server are
synchronized so that the same password is used to access both
printer and networking configuration pages. For printers that
support password synchronization, the same password is used
regardless of the embedded Web server page (printer Security page
or networking Admin. Account page) in which the password was
set.
If password synchronization is lost on these printers, recovery may
require one of the following procedures:
Restore both the printer and the Jetdirect print server to
factory-default states (for example, through a cold-reset), and
then reconfigure your settings.
Manually set the same administrator password using both the
printer Security page and the networking Admin. Account
page.
Certificates
(Certificate support depends on the print server model) This tab
provides access to installation, configuration and management
services for X.509 digital certificates. A digital certificate is an
electronic message typically containing, among other things, a key
(a short string used for encryption and decryption) and a digital
signature. Certificates may be issued and signed by a trusted third
party (commonly called a Certificate Authority, or CA), which may
exist internal or external to the organization. Or certificates may
be "self-signed", which is similar to validating your own identity.
Note
The Certificates page provides the status of the certificates
installed on the HP Jetdirect print server:
Jetdirect certificate. The Jetdirect certificate is used to
validate the identity of the Jetdirect device to clients and to
network authentication servers.
ENWW
While self-signed certificates are permitted and
allow data encryption, they do not ensure valid
authentication.
Using the Embedded Web Server 139