DNZUPX260E: A problem was encountered while updating target system "SYSTEM". It could be the connection to the file server timed out, because a firewall is preventing the connection that allows the firmware to download from the file server. Ensure that there are no firewalls blocking the connection by either turning off the firewall or opening the ports for TFTP (port 69), FTP (port 21), or SFTP (port 9520). Note that the management server could be the TFTP or SFTP server. Another possible reason is that the system has a limited number of concurrent user sessions and that limit was exceeded. Some devices limit the number of concurrent user sessions. If a problem occurred during the update, another user session was probably abandoned while in progress. Wait 15 minutes to allow enough time for the device to remove the hung session, then retry the operation. If the problem persists, contact Support.
This is an informational message only.