Sollae Systems CSE-H55N, User Manual

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CSE-H55N User
’
s Manual Ver. 1.2
- 63 -
http://www.ezTCP.com
10.2 Connection Problem over TCP/IP

Checking parameters related with TCP/IP
When CSE-H55N has a private network IP address, personal computer’s IP address
has to be 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
Local IP Address, Peer Address, Peer Port, Subnet
Mask, Gateway IP Address, DNS IP Address,
Table 10-1 major parameters related with TCP/IP

PING Test
Confirm the connection over the network by PING test. If the CSE-H55N 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 person in charge of their
network to release ports which will be used. (Ex: TCP 1470, UDP 50005)

Operation Mode
TCP connection is not possible when CSE-H55N 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
TCP is a protocol connected one to one without multiple connection function.
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.