Lantronix 485 User Manual
Troubleshooting
6. Troubleshooting
This chapter discusses how you can diagnose and fix errors quickly without having to contact Grid Connect.
When troubleshooting, always ensure that the physical connections (power cable, network cable, and serial
cable) are secure.
When troubleshooting, always ensure that the physical connections (power cable, network cable, and serial
cable) are secure.
Note: Some unexplained errors might be caused by duplicate IP addresses on the network. Make sure that your unit's
IP address is unique.
IP address is unique.
6.1.1 Problems and Error Messages
Problem/Message
Reason
Solution
Cannot ping or connect to the
NET485 DHCP name.
NET485 DHCP name.
The DHCP server is not
automatically setting the DHCP
name in DNS on the network.
automatically setting the DHCP
name in DNS on the network.
Contact the Network
Administrator to manually add the
NET485 to DNS.
Administrator to manually add the
NET485 to DNS.
When you issue the ARP –S
command in Windows, The ARP
entry addition failed: 5 message
displays.
command in Windows, The ARP
entry addition failed: 5 message
displays.
Your user login does not have
the right to use this command on
this PC.
the right to use this command on
this PC.
Have your IT department log you
in with sufficient rights.
in with sufficient rights.
Problem/Message
Reason
Solution
When you attempt to assign an
IP address to the unit by the
ARP method and Telnet to the
device server through port 1, the
connection fails.
IP address to the unit by the
ARP method and Telnet to the
device server through port 1, the
connection fails.
The ARP method only creates a
temporary password. When you
Telnet to port 1, the connection
should fail. When you Telnet into
port 9999 and do not press Enter
quickly, the device server
reboots, causing it to lose the IP
address.
temporary password. When you
Telnet to port 1, the connection
should fail. When you Telnet into
port 9999 and do not press Enter
quickly, the device server
reboots, causing it to lose the IP
address.
Telnet back to Port 1. Wait for it to
fail, then Telnet to port 9999
again. Make sure you press Enter
within 5 seconds.
fail, then Telnet to port 9999
again. Make sure you press Enter
within 5 seconds.
When you Telnet to port 9999,
the Press Enter to go into
Setup Mode message displays.
However, nothing happens when
you press Enter, or your
connection is closed.
the Press Enter to go into
Setup Mode message displays.
However, nothing happens when
you press Enter, or your
connection is closed.
To enter Setup Mode via Telnet,
the Enter key must be pressed
within 5 seconds.
the Enter key must be pressed
within 5 seconds.
Telnet to port 9999 again and
press Enter as soon as you see
the Press Enter to go into Setup
Mode message.
press Enter as soon as you see
the Press Enter to go into Setup
Mode message.
You may have entered the
Ethernet address incorrectly with
the ARP command.
Ethernet address incorrectly with
the ARP command.
Confirm that the Ethernet address
that you entered with the ARP
command is correct. The Ethernet
address must only include
numbers 0-9 and letters A-F. In
Windows and usually in Unix, the
segments of the Ethernet address
are separated by dashes. In some
forms of Unix, the Ethernet
address is segmented with
colons.
that you entered with the ARP
command is correct. The Ethernet
address must only include
numbers 0-9 and letters A-F. In
Windows and usually in Unix, the
segments of the Ethernet address
are separated by dashes. In some
forms of Unix, the Ethernet
address is segmented with
colons.
When you Telnet to port 1 to
assign an IP address to the
device server, the Telnet window
assign an IP address to the
device server, the Telnet window
The IP address you are trying to
assign is not on your logical
subnet.
assign is not on your logical
subnet.
Confirm that your PC has an IP
address and that it is in the same
logical subnet that you are trying
to assign to the device server.
address and that it is in the same
logical subnet that you are trying
to assign to the device server.
NET485 User Guide
6-1