ZyXEL Communications GS2210 Series - CHAPTER 8 Basic Setting

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1.11.4 What Could Go Wrong
1 If you encountered an error message like in the screenshot
below. Please check the following information:
a. Please check the IP interface settings on the TFTP server,
and make sure that the server IP is correct.
b. The TFTP server IP configured in the DHCP server settings
must be the same.
c. Check if the packet has been blocked by the TFTP firewall.