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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. Upgrade the NPort Server firmware and driver to the latest versions; the programs can be downloaded from http://web..com.tw/services/download/download.asp.
    

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

   c. 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 Server Pro's IP address.
2. In the [OP_mode] menu, set [Mode] to "RAW Connection".
3. In [Description / more setting] , set [TCP port] as needed; note that the default [TCP port] value is [4001].

For example, if NPort Pro'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 Server Pro's Serial Communication Parameters, you should configure the parameters under the [Line] menu of the Telnet console.

1. Host Based Mode :

   a. The DE303 driver uses TCP Ports 950 -- 965 as data ports and 966 -- 981 as command ports.

   b. The DE308 driver uses TCP Ports 950 -- 957 as data ports and 966 -- 973 as command ports.

2. RAW Connection Mode:

   There are no command ports in this operation mode. The only port is the configurable TCP data Port, which is set to 4001 by default.

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.

If you wish to use more than one host to access the same NPort Server Pro, you will need to install NPort Server Pro under Custom Mode.

1. Password Mismatch

If you type the wrong password while running NPort Pro Manager, the Manager program automatically assumes that you are not the administrator. The administrator of the server is the only one allowed to modify the server's configuration. Keep in mind that even when multiple hosts share the same server, access to the server's administrative functions is still protected.

If you need to change some configuration settings, you will have to ask your administrator for help. If you are the administrator but forget the password, you can erase the current password yourself by pressing the RESET key on NPort Server Pro's back panel for three seconds.
 

2. Installation Type Mismatch

You cannot change the server IP address if you are installing NPort Server Pro under Single-Host Mode. Setting the installation procedure up in this way makes the Single-Host Mode configuration procedure very similar to installing a traditional multi-port serial board.

Under Single-Host Mode, users are only allowed to modify the server's name and password. This is because Single-Host users are not sharing their NPort Server Pro with other hosts.

If you do need to modify other properties, run the setup program and change to another mode of operation (see Chapter 8 of the NPort Server Pro User's Manual for details).

 

1. Check the NPort Manager mode. If it is Single-Host Mode, reinstall it as either Multi-Host Mode or Custom Mode.
2. Double check your credentials to make sure that you are the administrator.
    

[POSSIBILITY]

1. Your NT/95/98 machine is just one of the hosts sharing the ports on the selected server, and you did not provide the server password while installing NPort Server Pro.
    
2. You install NPort Server Pro at a local site, with no access problems, but later move the server to a remote site and connect through a WAN. Due to the different network interface connection, your IP address might have changed, and as a consequence, you are no longer on the server's Access Control List.
    

[SOLUTION]

1. Confirm your IP address with NPort Server Pro.
    
2. Ask the administrator to set up the server configuration so that you are on NPort Server Pro's Access Control List.

    

If the host and server are in the same location:

1. Make sure NPort Server Pro's power cable is plugged in, and the server is receiving power.
2. Check that the server's network connector is plugged in properly.
3. Make sure your computer is properly connected to the network.
4. Double click on the server icon that has the question mark (?) on top. This will evoke NPort Pro Manager to reconnect with the server.

If the server is at remote site:
 

1. Make sure the network connection to the remote site is okay. If no route can be established to the remote server, and you are connecting through the Internet, you may need to wait until the route is reestablished.
2. If the route is okay, try typing
   
   ping [server-IP-address]
   
   from your NT host, where [server-IP-address] is the server's IP address.
3. If the server cannot be pinged, you will need to ask someone at the remote site to check and see if the power is on, and make sure that the connection is okay. After that, double click on the server icon that has the question mark (?) on top. This will evoke NPort Pro Manager to reconnect with the server.
    

If the problem is still not fixed, contact technical support for further assistance.

 

To recover from this problem, you should:

1. Ask the administrator of your DHCP server to assign a dedicated IP address to both your Windows NT/95/98 host and to NPort Server Pro.
2. Make sure your NPort Manager Pro operating mode is either Multi-Host Mode or Custom Mode.
    
3. Change the IP address of the server to the dedicated IP address assigned by your DHCP administrator.
    
4. Change the IP address of your Windows NT/95/98 host to the dedicated IP address assigned by your DHCP administrator.
   
   Note: Please refer to Appendix D of the User's Manual to learn how to configure your Windows NT/95/98 to the dedicated IP address.
5. Modify the Security list to include your NT/95/98 host.
    
6. Save Configuration.