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Tips
• The subnet mask value indicates the number of
bits that are masked off from the left. For
example, the subnet mask value for
255.255.255.0 is 24.
If you set "192.168.0.0/24" and [Allow],
computers having an IP address between
192.168.0.0 and 192.168.0.255 have access
allowed.
• You can access the unit even from a computer
with an IP address whose access right is set to
[Deny], if you enter the user name and
password set for the Administrator using the
[User] tab of the [Security] page on the
authentication screen.
[SSL] tab
Use to configure the SSL or TLS function
(hereinafter referred to as SSL). Configuring
these settings allows the unit to use SSL
communication with client devices.
Notes
• The China model does not support the SSL
function.
• When using the SSL function, always configure
the settings after setting the date and time of
the unit. If the date and time are not set
correctly, it may not be possible to connect to
the unit using a web browser.
• Reload the web browser after you change the
SSL settings.
• "TLS1.2" encryption is employed for high-
security communication.
To enable the SSL function
Select [Enable] from the [SSL Function] pull-
down menu to enable the SSL function.
When [Enable (Allow HTTP connection for some
clients)] is selected, both SSL connections and
HTTP connections are allowed.
When [Enable] is selected, only SSL connections
are allowed.
Precautions with SSL connections
When you use only SSL connections with the SSL
function set to [Enable], you will not be able to
access the unit if the SSL function is not working
properly.
In this case, you must reset the unit to the factory
settings. (All settings will be initialized.)
To avoid this, check that SSL connection can be
established before configuration by performing
the following steps.
1
Set the SSL function to [Enable (Allow HTTP
connection for some clients)].
Note
Always select [Enable (Allow HTTP
connection for some clients)]. If it is not
selected and the SSL connection fails, you
will not be able to access the unit.
2
Click the [OK] button to close the web
browser.
3
Display the web browser using an SSL
connection.
4
After confirming that SSL connection is
possible, set the SSL function to [Enable].
Tip
If the SSL connection fails while checking the
connection, you can select [Enable (Allow HTTP
connection for some clients)] to connect using
an HTTP connection. Check the settings on the
[SSL] tab using an HTTP connection, and then
check the SSL connection again.
[Certificate Options]
Select the certificate installation mode.
[Use an external certificate]: This mode uses a
certificate (including private key information)
issued by a CA. PKCS#12 and PEM certificate
formats are supported.
[Use a self-signed certificate (For test use)]:
This mode uses a certificate and private key
pair generated as described in "To generate a
self-signed certificate" (page 20). The private
key information corresponding to the
certificate is stored within the unit.
You do not need to install an external
certificate, but validating its existence, which
is one of the SSL functions, is not possible for
the following reasons.
• Self-signing uses the private key generated
in the unit.
• A preconfigured value is set for the
Distinguished Name (Common Name, and
so on).
19
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