280 6 Troubleshooting
021-426 The URL (CURL) of the proxy setting file is not found on the DHCP or DNS server while connecting to the
EP system via the Internet to obtain the URL (CURL) of the proxy setting file.
Check the followings:
• The EP proxy server setting
• The URL of the proxy setting file is registered on the DHCP or DNS server correctly
021-501 The communication with the EP system via the internet failed.
Switch off the machine power, make sure that the display is blank, and then switch on the machine
power. If the error still is not resolved, contact our Customer Support Center.
021-502 An error occurred while connecting to the EP system via the Internet. There is a problem with the
address of the EP proxy server name.
Switch off the machine power, make sure that the display is blank, and then switch on the machine
power. Execute the operation again. If the error still is not resolved, contact our Customer Support
Center.
021-503 An error occurred while connecting to the EP system via the Internet. There is a problem with the
address of the EP proxy server name.
Check the followings:
• LAN cable connection
• DNS server address setting
• The default gateway setting
• The subnet mask setting
If the error still is not resolved after checking the above settings, there may be a network failure or the
proxy server settings may be changed or failed. Consult your system administrator.
If the network works normally but the error still is not resolved, contact our Customer Support Center.
021-504 An error occurred while connecting to the EP system via the Internet.
Check the followings:
• LAN cable connection
• DNS server address setting
• The default gateway setting
• The subnet mask setting
If the error still is not resolved after checking the above settings, there may be a network failure or the
proxy server settings may be changed or failed. Consult your system administrator.
If the network works normally but the error still is not resolved, contact our Customer Support Center.
021-505 The SSL/TLS communication with the EP server failed.
Switch off the machine power, make sure that the display is blank, and then switch on the machine
power. If the error still is not resolved, contact our Customer Support Center.
021-506 The SSL Certificate for the EP server is incorrect.
Switch off the machine power, make sure that the display is blank, and then switch on the machine
power. If the error still is not resolved, contact our Customer Support Center.
021-507 An error occurred while connecting to the EP system via the Internet.
Check the followings:
• The login user of the EP proxy server
• The password of the EP proxy server
If the error still is not resolved after checking the above settings, there may be a network failure or the
proxy server settings may be changed or failed. Consult your system administrator.
If the network works normally but the error still is not resolved, contact our Customer Support Center.
021-508 An error occurred while connecting to the EP system via the Internet.
Check the followings:
• LAN cable connection
• DNS server address setting
• The default gateway setting
• The subnet mask setting
If the error still is not resolved after checking the above settings, there may be a network failure or the
proxy server settings may be changed or failed. Consult your system administrator.
If the network works normally but the error still is not resolved, contact our Customer Support Center.
021-509 An error occurred while communicating with the EP server.
Switch off the machine power, make sure that the display is blank, and then switch on the machine
power. If the error still is not resolved, contact our Customer Support Center.
Error Code Cause/Remedy
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