NEC UX5000 Resource Manual page 192

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Message Can not proceed because there is active connection. Please wait
for a while.
Explanation Communication with the terminal is now terminating.
Response Wait for a while and then retry.
Message There is session error. Connection will be closed.
Explanation An attempt to acquire session information (communication ID)
with the target terminal has failed.
Response Check the following:
If you are logged into the terminal in WebPro, log out.
If the Menu screen of the terminal is displayed, switch it to
the Standby screen.
Message There is session timeout. Connection will be closed.
Explanation A timeout occurred during communication with the terminal.
Response Check the following:
Are the terminal and PC connected via the network? (The
network connection may have been disconnected during
communication.)
Is the network line congested?
Message There is undefined HTTP error. Connection will be closed.
Explanation An error occurred during HTTP communication.
Response Check the following:
Is the IP address specified in "Specified Terminal" correct?
(The IP address of a device that is not a terminal may have
been specified.)
If this error still occurs despite this response, restart the tool
and then retry.
UX5000 IP Data Maintenance
Data Maintenance Tool