Problems Using Network Security Features
Forgot a Pre–shared Key
Re-configure a pre-shared key.
To change the key, access Web Config and select the
Network Security
tab >
IPsec/IP Filtering
>
Basic
>
Default
Policy
or
Group Policy
.
When you change the pre-shared key, configure the pre-shared key for computers.
Cannot Communicate with IPsec Communication
Specify the algorithm that the scanner or the computer does not support.
The scanner supports the following algorithms. Check the settings of the computer.
Security Methods
Algorithms
IKE encryption algorithm
AES-CBC-128, AES-CBC-192, AES-CBC-256, AES-GCM-128*, AES-GCM-192*,
AES-GCM-256*, 3DES
IKE authentication algorithm
SHA-1, SHA-256, SHA-384, SHA-512, MD5
IKE key exchange algorithm
DH Group1, DH Group2, DH Group5, DH Group14, DH Group15, DH
Group16, DH Group17, DH Group18, DH Group19, DH Group20, DH
Group21, DH Group22, DH Group23, DH Group24, DH Group25, DH
Group26, DH Group27*, DH Group28*, DH Group29*, DH Group30*
ESP encryption algorithm
AES-CBC-128, AES-CBC-192, AES-CBC-256, AES-GCM-128, AES-GCM-192,
AES-GCM-256, 3DES
ESP authentication algorithm
SHA-1, SHA-256, SHA-384, SHA-512, MD5
AH authentication algorithm
SHA-1, SHA-256, SHA-384, SHA-512, MD5
*available for IKEv2 only
Cannot Communicate Suddenly
There is an error in the certificate.
The scanner's date and time settings may be incorrect if power has not been supplied to the scanner for a long
time.
When the scanner is connected using a client certificate for IPsec/IP filtering or IEEE802.1X, an error is indicated
if a time lag occurs between the scanner's date and time and the validity period for the certificate. Because the
scanner recognizes that the certificate is unavailable.
You can solve this problem by correcting the scanner's date and time settings. Connect the scanner and the
computer using a USB cable, turn the scanner on, and then perform scanning over USB using Epson Scan 2. The
scanner is synchronized with the computer and the date and time settings are corrected. The scanner indicates
normal status.
>
>
Solving Problems for Advanced Security
159
