I'm trying to take backup file from my WLC (8540), but I'm receiving below error, please your kind advices as I'm planning to upgrade my WLC.
FYI, I checked the permission in TFTP server, everything is Ok.
% Error: Config file transfer failed - Error from server: Undefined error code
thanks in advance.
I'm using Tftpd32 app, in Windows machine, and there is no any errors in the server, I'm using same server with other devices, its working fine.
what is the tftp server you are using? check tftp server logs for any errors or warnings
guess your windows firewall and AV disabled? any output in server tftp interface? any messages?
If you search the error, you will see many post on this. Like the others mentioned, it is something to do with your tftp setup or something blocking. Upload something else than the configuration to the tftp server and see what happens. Your best bet is to try ftp or another device also.