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13. Troubleshooting
In this chapter, we describe a straightforward procedure that can be used to troubleshoot problems you
encounter when operating your NPort. We recommend that you follow these step by step instructions first
before contacting Moxa’s technical support team.
Connection Problems
Step 1: Does the Ethernet LED light up?
If not, try the following:
• Use a straight-through Ethernet cable to connect the unit to the network.
• Use an Ethernet cable that is less than 100 meters long.
• Make sure there is no defect with your hub or switch’s Ethernet port.
Step 2: Does your hub, switch, or NIC’s “Link” LED light up?
If not, try the following:
• Use a straight-through Ethernet cable to connect the unit to the network.
• Make sure the NIC (if applicable) is installed correctly.
• Use an Ethernet cable that is less than 100 meters long.
• Make sure there is no defect with your hub or switch’s Ethernet port.
Step 3: Can you ping the device server from your host?
If not, try the following:
• Make sure that there are no problems with IP configuration.
• If a router is not used, make sure that the device server and the host must be on the same network subnet
if a router is not used.
• If a router is used, make sure that gateway and routing settings are correct. Use “tracert” to follow up. Make
sure that the routers don’t filter PING (ICMP) or port numbers. Refer to Moxa FAQ #441 for the proper
TCP/UDP ports.
Step 4: Is the correct operation mode being used?
If not, try the following:
• Select the proper operation mode for the device port in the web console or in NPort Administrator.
Remember, each device port is set to Real COM mode by default.
• Save changes and restart the device server to activate new settings.
Operation Mode Problems
Real COM Mode
Step 1: Are you able to install the drivers successfully?
If not, try the following:
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