HP 680n - JetDirect Print Server Administrator's Manual page 150

To add an entry into the access control list, use the IP Address and
Mask fields to specify a host, and click (check) the Save checkbox
for that entry. Then click Apply.
To delete an entry from the list, clear the Save checkbox for that
entry. Then click Apply.
To clear the entire access control list, clear all Save checkboxes,
and click Apply.
Mgmt. Protocols
This link provides access to management communications and
other protocols that affect security.
Web Mgmt.
Use this tab to manage communications with the embedded Web
server from Web browsers. This tab appears only for full-featured
print servers.
By default, the embedded Web server provides encrypted
communications through port 443, the well-known port for HTTPS
(secure HTTP) traffic. Although ports 80, 280, or 631 continue for
IPP (Internet Printing Protocol) use, other non-secure
communications are ignored.
Although not recommended, you may choose to accept both HTTPS
and HTTP communications that are not secure by disabling
(clearing) the Encrypt All Web Communication checkbox.
To support the use of HTTPS communications, a Jetdirect
certificate must be installed. A factory-default, self-signed
certificate is preinstalled for initial use. Click the Configure button
to update the preinstalled certificate, or to install a new one. For
more information, see Configuring Certificates.
Encryption strength must be specified when using a Jetdirect
certificate. You may select Low (default), Medium, or High
encryption strength.
For each encryption strength, ciphers are specified to identify the
weakest cipher allowed. Early browsers may only support 40-bit
(Low) encryption levels.
Using the Embedded Web Server 150
ENWW