Unable to upload config via TFTP from a member of the stack

[DSV12]

Two 2510G (fw. Y_11_16.swi) are configured in a stack. SW-0 (commander) has IP address, SW-1 (member) - has not.

I CAN to DOWNLOAD files (for example, new firmware) on member switch by tftp without any troubles:

sw-1# copy tftp flash 1.1.1.1 Y_11_16.swi


But when I try to UPLOAD some file (e.g. config) to tftp-server, I get:

sw-1#: copy startup-config tftp 1.1.1.1 my.cfg
00000K Peer unreachable.

From commander upload works perfectly.

Why I can't to UPLOAD file from stack member?

[BGP4]

check if "tftp client" and "tftp server" is set over CLI

check if the filenames are correct

check permissions, firewall

try it with an ip set

maybe the tftp client is just switched off...