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Security Function Supplementary Guide 
 
44
 
016-781  Cause Unable to connect to the SMTP server. Unable to establish a 
connection between the machine and the server. Although the connection 
between the machine and the server has been established, ASCII characters 
are not used for the host name specified on the machine. 
Remedy Take one of the following measures: 
Check whether the network cables are plugged in securely. 
Enter the host name using ASCII characters.. 
016-791  Cause Failed to access to the destination computer or the save location for 
Network Scanning. 
Remedy Check the directory configuration and files on the server, the access 
privileges for the destination or the location, and check if you are authorized to 
access the specified destination computer or server. 
018-400  Cause When IPSec is enabled, there is an inconsistency in IPSec settings as 
follows: The password is not set when Authentication Method is set to 
Preshared Key. 
An IPSec certificate is not set when Authentication Method is set to Digital 
Signature. 
RemedyCheck the IPSec settings, and enable IPSec again: 
When Authentication Method is set to Preshared Key, set the password. 
When Authentication Method is set to Digital Signature, set an IPSec 
certificate. 
018-405  Cause An error occurred during LDAP authentication. 
Remedy The account is disabled in the active directory of the authentication 
server, or the access is set to disabled. 
Consult your network administrator. 
018-502  Cause The machine failed to transfer data using SMB of the Scan to PC 
service because computers allowed to login are restricted. 
Remedy Confirm the property information for the specified user, and check 
whether the computers allowed to login to the server are restricted. 
018-505  Cause Failed to log into the destination computer while transferring data 
using SMB of the Scan to PC service. 
Remedy Check whether the user name and password of the SMTP server 
registered in the machine is correct. 
018-543  Cause The machine failed to transfer data using SMB of the Scan to PC 
service because one of the following problems occurred on the shared name 
of the SMB server when logging in to the SMB server: 
The specified shared name does not exist on the server. Invalid characters are 
used in the specified shared name. 
When the server is Macintosh, the specified shared name may not have an 
access right.  
Remedy Confirm the specified shared name, and set the name correctly.