Lantronix 10 User Manual

Troubleshooting 

UDS-10 User Guide 

6-3 

When you issue the ARP –S 
command in Windows, “The 
ARP entry addition failed: 5" 
message displays.  

Your currently logged-in user 
does not have the correct rights 
to use this command on this PC.  

Have someone from your IT 
department log you in with 
sufficient rights.  

When you attempted to assign 
an IP address to the 

UDS/CoBox

 via the ARP 

method, the “Press Enter to go 
into Setup Mode” error 
(described below) displayed. 
Now when you Telnet to the 
UDS/CoBox, the connection 
fails.  

When you Telnet into port 1 on 
the UDS/CoBox, you are only 
assigning a temporary IP 
address. When you Telnet into 
port 9999 and do not press Enter 
quickly, the UDS/CoBox will 
reboot, causing it to lose the IP 
address.  

Telnet back into Port 1. Wait for it 
to fail, then Telnet to port 9999 
again. Make sure you press Enter 
quickly.  

When you Telnet to port 9999, 
the message “Press Enter to go 
into Setup Mode” displays. 
However, nothing happens 
when you press Enter, or your 
connection is closed.  

You did not press Enter quickly 
enough. You only have 5 
seconds to press Enter before 
the connection is closed.  

Telnet to port 9999 again, but 
press Enter as soon as you see 
the message “Press Enter to go 
into Setup Mode.”  

You may have entered the 
Ethernet address incorrectly with 
the ARP command.  

Confirm that the Ethernet address 
that you entered with the ARP 
command is correct. The Ethernet 
address may 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.  

The IP address you are trying to 
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 

UDS/CoBox

.  

When you Telnet to port 1 to 
assign an IP address to the 

UDS/CoBox

, the Telnet window 

does not respond for a long 
time.  

The 

UDS/CoBox

 may not be 

plugged into the network 
properly.  

Make sure that the Link LED is lit. 
If the Link LED is not lit, then the 
UDS/CoBox is not properly 
plugged into the network.  

When you try to assign an IP 
with Device Installer, you get 
the following message:  
  
“No response from device!  
Verify the IP, Hardware  
address and Network Class.  
Please try again.”  

The cause is most likely one of 
the following:  
The Hardware address you 
specified is incorrect.  
The IP address you are trying to 
assign is not a valid IP for your 
logical subnet.  
You did not choose the correct 
subnet mask.  

Double-check the parameters that 
you specified. Tip: You cannot 
assign an IP address to a 

UDS/CoBox

 through a router.