Message Causes Solutions
"XXX cannot be YYY
because the Digital
Signature's device certificate
is not currently valid."
(XXX and YYY indicate the
user action.)
The device certificate (PDF
with digital signature or
PDF/A with digital
signature) has expired.
A new device certificate (PDF with
digital signature or PDF/A with digital
signature) must be installed. For details
about how to install a device certificate
(PDF with digital signature or PDF/A
with digital signature), see Security
Guide.
"XXX cannot be YYY
because there is a problem
with the Digital Signature's
device certificate. Check the
device certificate."
(XXX and YYY indicate the
user action.)
There is no device certificate
(PDF with digital signature or
PDF/A with digital
signature), or the certificate
is invalid.
A new device certificate (PDF with
digital signature or PDF/A with digital
signature) must be installed. For details
about how to install a device certificate
(PDF with digital signature or PDF/A
with digital signature), see Security
Guide.
• If a fax or an e-mail cannot be sent and a message appears which states that there is a problem
with the device certificate or user certificate, a new certificate must be installed. For details about
how to install a new certificate, see Security Guide.
When Problems Occur While Logging In
Message Causes Solutions
"Authentication has failed." The entered login user name
or login password is not
correct.
For details about the correct login user
name and login password, see
Security Guide.
"Authentication has failed." The machine cannot perform
authentication.
For details about authentication, see
Security Guide.
10. Troubleshooting
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