Operation Manual – IPv6 ConfigurationH3C S5500-SI Series Ethernet Switches Chapter 2 IPv6 Application Configuration2-9z If yes, check whether the UDP port used by Traceroute has the requiredapplication in the destination host If yes again, specify a UDP port that isunreachable in the tracert ipv6 command.2.8.3 Unable to Run FTPI. SymptomUnable to download and upload files by performing FTP operations.II. Solutionz Determine the FTP server application is running on the server. Check theconfiguration allows the server reachable.z Determine that the file system of the device is usable. You can check it by runningthe dir command under the user view.z Determine the route between the device and the FTP client is available.2.8.4 Unable to Run TFTPI. SymptomUnable to download and upload files by performing TFTP operations.II. Solutionz Determine that the ACL configured for the TFTP server does not block theconnection to the TFTP server.z Determine that the file system of the device is usable. You can check it by runningthe dir command under the user view.z Determine the route between the device and the TFTP server is available.2.8.5 Unable to Run TelnetI. SymptomUnable to login to Telnet server by performing Telnet operations.II. Solutionz Determine the Telnet server application is running on the server. Check theconfiguration allows the server reachable.z Determine the route between the device and the Telnet client is available.