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9. Troubleshooting
Message
"Network communication
has failed. SIP digest
authentication failed.
Please check the SIP
digest authentication user
name and password."
"Network communication
has failed. The certificate
of destination is not
currently valid. Please re-
issue it."
"Network communication
has failed. The certificate
of this machine is not
currently valid. Please re-
issue it."
"Network communication
has failed. The certificate
of this machine or
destination machine is
not currently valid. Please
re-issue it."
"Network communication
has failed. The
destination does not
support IP-FAX."
"Network communication
has failed. The IP address
is invalid. Please check
the network settings."
250
Condition
The authentication
password on the SIP
server and the password
registered on the
machine do not match.
The user certificate
(destination certificate)
has expired.
A device certificate
(destination certificate)
is not registered or has
expired.
The user certificate
(destination certificate)
and device certificate
have expired.
An IP-Fax was sent to a
destination that does not
support IP-Fax.
An invalid IP address is
registered.
Solution and reference
Check that the password registered on the SIP
server and "Password" in SIP Digest
Authentication under [Settings]
Features Settings]
[Fax Settings]
Settings] tab
[SIP Settings] match.
See "Sending Documents by IP-Fax", User
Guide (Full Version).
Install a new user certificate.
See "Encrypting Network Communication",
User Guide (Full Version).
Install a new device certificate.
See "Encrypting Network Communication",
User Guide (Full Version).
Install a new user certificate and device
certificate.
See "Encrypting Network Communication",
User Guide (HTML version).
Sending a fax using the IP-Fax function is not
possible. Send the fax using the G3 line if
possible.
Specify the correct [Effective Protocol] and
[Machine IPv4 Address], or [Machine IPv6
Address] on the [Settings]
Features Settings]
[System Settings]
[Interface Settings] tab.
See "Connecting to a Wired LAN", User
Guide (Full Version).
[Machine
[Initial
[Machine
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