Ricoh IM 5000 User Guide - Page 255
See Connecting to a Wired LAN, User Guide, Specify the correct [Effective Protocol] and [IP
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When a Message Appears While Using the Fax Function Message Condition Solution and reference "Network communication has failed. SIP digest authentication failed. Please check the SIP digest authentication user name and password." The authentication password on the SIP server and the password registered on the machine do not match. Check that the password registered on the SIP server and "Password" in SIP Digest Authentication under [Settings] [Fax Settings] [Detailed Initial Settings] [IPFax Settings] [SIP Settings] match. See "Sending Documents by IP-Fax", User Guide (Full Version). "Network communication has failed. The certificate of destination is not currently valid. Please reissue it." The user certificate (destination certificate) has expired. Install a new user certificate. See "Encrypting Network Communication", User Guide (Full Version). "Network communication has failed. The certificate of this machine is not currently valid. Please reissue it." A device certificate (destination certificate) is not registered or has expired. Install a new device certificate. See "Encrypting Network Communication", User Guide (Full Version). "Network communication has failed. The certificate of this machine or destination machine is not currently valid. Please re-issue it." The user certificate (destination certificate) and device certificate have expired. Install a new user certificate and device certificate. See "Encrypting Network Communication", User Guide (Full Version). "Network communication has failed. The destination does not support IP-FAX." An IP-Fax was sent to a destination that does not support IP-Fax. Sending a fax using the IP-Fax function is not possible. Send the fax using the G3 line if possible. "Network communication has failed. The IP address is invalid. Please check the network settings." An invalid IP address is registered. Specify the correct [Effective Protocol] and [IP Address (IPv4)], or [IP Address (IPv6)] on [Settings] [System Settings] [Network/ Interface]. See "Connecting to a Wired LAN", User Guide (Full Version). 253