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44951501TH Rev.2

7-70

Oki Data CONFIDENTIAL

7. TROUBLESHOOTING

7.5.4.5 Other questions (C331/C531 only)

Other possible questions are described below.

7.5.4.5.1 Time required for creation of a certiﬁcate

It takes several tens of seconds to create a certiﬁcate.

7.5.4.5.2 Communication time when the encryption function is

enabled

When the encryption function is being used, communication time takes longer than usual.

7.5.4.5.3 Can encrypted printing be performed without IPP?

Answer: Encrypted printing is not available without IPP.

Encr

yption can be performed only in IPP printing.

7.5.4.5.4 What will happen if SSL/TLS is set to OFF after a

certiﬁcate is created (or installed)?

Answer: A certiﬁcate will be remained saved as it is.

If SSL/TLS is set to ON again, the cer

tiﬁcate becomes available.

7.5.4.5.5 How to change the port number

nswer: The port number for SSL/TLS communication is ﬁxed to 443.

It cannot be changed.

7.5.4.5.6 The error message “The security certiﬁcate was issued

by a company you have not chosen to trust. View the

certiﬁcate to determine whether you want to trust the

certifying authority” is displayed.

When this error message appears, it means that the certificate installed in the printer is

self-signed certiﬁcate. Other possibilities are that the certiﬁcated installed in the printer is a

certiﬁcated of a certifying authority, and also either a CA certiﬁcate of the certifying authority

or an intermediate certiﬁcate has not been installed in the client PC.

If the certificate is a self-signed certificate, the error message (security warning) doesn’t

appear after the self-signed certiﬁcate of the printer is installed in the client PC.

If the installed in the printer is a certiﬁcate of a certifying authority, the error message (security

warning) doesn’t appear after the CA certiﬁcate or the intermediate certiﬁcate of the certifying

authority is installed in the client PC.

Solution: Install such certiﬁcates in the client PC (browser).

[Steps]

1. Click the View Certiﬁcate button on the error (security warning) screen.

Oki C301 Maintenance Manual

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