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There are 2 possible causes of this situation.
 

1. The PC and Nport Server are connected via a router.
2. The PC and Nport Server are connected via a NAT server.

[Solution]

1. If the PC and Nport Server are connected via a router: You can assign an IP manually from NPort Manager (or Utility), instead of using Auto search.
    
2. The PC and NPort Server are connected via a NAT server: The following procedure solves this problem:

   a. Type the NPort Server IP address manually when using NPort Manager or Firmware Utility.
    

   b. Ask your Network Administrator to open UDP ports 0x404 and 0x405. Both NPort Server Manager and Firmware Utility will broadcast a "locate request" to search for NPort Servers on the LAN.
   
   Since a Router will filter all broadcast packets, neither NPort Utility nor NPort Manager can find an NPort Server located outside a Router. Hence, the locate request packet is filtered by the Router, and the NAT Server not only filters the broadcast packet but also changes the source TCP/UDP port for each IP packet.
   
   The previous firmware version of NPort Server will check the UDP port of the sender before replying. That 's why NPort Server can't be found through a NAT Server. The latest firmware version has solved this problem.

NPort Server Pro: DE303/308
NPort Server Lite: DE301/302/304/331/332/334
NPort Express: DE311/311M
Async Server: CN2100/CN2504/CN2508/CN2516

Both NPort Server Family and Async Server Family support UDP protocol for utilities only, but most of these products do not support UDP programming.

The exceptions are NPort Express DE311 and DE311M, which both support UDP programming.

1. Telnet NPort Express's IP address.
2. In the [OP_mode] menu, set [Application] to "Raw Connection (TCP Server)".
3. In [Description/more setting], set [TCP port ] as needed; note that the default [TCP port] value is [4001].

For example, if NPort Express's IP is 192.168.127.254 (default value), simply issue the command "telnet 192.168.127.254 4001" to establish a TCP connection.

If you want to configure NPort Express's Serial Communication Parameters, you should configure the parameters under the [Serialport] menu of the Telnet console.

1. Host Based Mode:

   The DE311/311M driver uses TCP Port 950 as a data port and 966 as a command port.

2. RAW Connection and Ethernet Modem Mode:

   There are no command ports for these operation modes. Both modes only use a configurable TCP data Port, which is set to 4001 by default.

3. Pair Connection Mode:

   There is no command port in this operation mode. The only port is a TCP data port, which is set to 4001 by default (this port number is fixed).

The method for upgrading NPort Server Family's firmware under Windows 2000 is as follows.

1. First download NPort Family's latest Windows 2000 driver, which includes an "Upgrade.exe" utility (software is located at the web site at http://web..com.tw/services/download/download.asp).
2. Run "Upgrade.exe". This utility starts by searching for NPort devices connected to the network.
3. After an NPort device is found, select the new firmware and upgrade it.
4. If no NPort Server Devices could be found, you will need to input an IP address manually. After an NPort device is found, you can upgrade the firmware.

1. telnet NPort Express's IP address.
2. Check the "Conn. Status" message under [Monitor].

   a. If a connection hasn't been established, the Conn. Status shows"listen".

   b. If a connection has been established, the Conn. Status shows"remote IP xxx.xxx.xxx.xxx ".