Sollae Systems CSW-H80, User Manual

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CSW-H80 User Manual Ver. 3.0
- 59 -
http://www.ezTCP.com
8.2 Connection Problem over TCP/IP

Connection with the wireless network
Check if the wireless channel is fine.

Checking parameters related with TCP/IP
When CSW-H80 has a private network IP address, personal computer’s IP address has
to be in the same sub network. Check if the IP address and local port number are
correct. In case of a fixed IP address, the subnet mask, gateway IP address and DNS
IP address should be configured.
TCP Server side TCP Client side
Local IP Address, Local Port, Subnet
Mask, Gateway IP Address, DNS IP
Address, DDNS option, and etc.
Local IP Address, Peer Address, Peer Port,
Subnet Mask, Gateway IP Address, DNS IP
Address, and etc.
Table 8-1 major parameters related with TCP/IP

PING Test
Confirm the connection over the network by PING test. If the CSW-H80 doesn’t send
any reply from the request, check the network environment.

Firewall
In case the networks which need strong security, the access may be denied by their
firewall. Under this circumstance, users should ask the network administrator to
release ports which will be used. (Ex: TCP 1470, UDP 50005)

Operation Mode
TCP connection is not possible when CSW-H80 is operating in the ISP or Serial
Configuration mode.

Communication Mode
To make TCP connection, both a server and client should exist. If there are only
servers or clients, TCP connection can’t be established.

ezTCP Firewall
When users set the ezTCP firewall with MAC and IP address, any hosts can’t be
reachable to it except for the hosts which have the allowed MAC and IP address.
Inactivate the option or check the setting is correct.

Checking the TCP status
Basically TCP is a protocol connected one to one. Because of this, if a device is on
TCP connection, other requests are denied. If users are in this situation, check the
network status by connecting on TELNET or using ezManager.