Canon ImageRunner 2545i Reference Manual page 175

Cannot connect to the selected server. Check the settings.
Cause
Remedy 1 Check the gateway address setting. (See Chapter 2, "Connecting the Machine
Remedy 2 Check the server address and port number for the LDAP server. (See Chapter
Remedy 3 Check that the LDAP server is operating properly.
Remedy 4 If <Login Information> is set to 'Use (security authent.)' for the LDAP server,
Cannot connect to the server because timer settings for this device differ to those of the
selected server.
Cause
6
Remedy
Cannot find the selected server. Check the settings.
Cause 1
Remedy 1 Check the DNS (Domain Name System) server settings. (See Chapter 2,
Remedy 2 Check whether the DNS server's DNS settings are correct.
Cause 2
Remedy
6-8
Self-diagnostic Display
The machine cannot connect to the specified IP address/port.
to a TCP/IP Network," in the System Settings Guide.)
3, "Setting up the Machine for Your Network Environment," in the System
Settings Guide, or Chapter 4, "Customizing Settings," in the Remote UI Guide.)
check whether UDP (User Datagram Protocol) packages are blocked by the
filter.
The time setting of the LDAP server and the time setting of the machine are
more than five minutes apart.
The machine cannot connect to an LDAP server if the time setting of the server
and the time setting of the machine are more than five minutes apart with
<Login Information> set to 'Use (security authent.)' for the LDAP server. Check
the time settings on the server and the machine.
The IP address that the machine should connect to cannot be determined.
"Connecting the Machine to a TCP/IP Network," in the System Settings Guide.)
If <Login Information> is set to 'Use (security authent.)' for the LDAP server, the
machine cannot determine the host name.
Check the DNS (Domain Name System) server settings. (See Chapter 2,
"Connecting the Machine to a TCP/IP Network," in the System Settings Guide.)