TFTP Write is broken

[satirebird]

I have tried to transfer a file from an embedded device (u-boot) to the host.

I got a lot of error messages:

.....
tftp WRQ 'cfg.dat' from 192.168.3.201:2864
tftp WRQ 'cfg.dat' from 192.168.3.201:2864
tftp WRQ 'cfg.dat' from 192.168.3.201:2864
tftp WRQ 'cfg.dat' from 192.168.3.201:2864
192.168.3.201: Failed opening '/cfg.dat'. Error 24: Too many open files
*** buffer overflow detected ***: terminated

The tftp-hpa server works totally fine with the same device.