These GnuTLS error messages are fairly cryptic. ''Error in the push function'' usually means the data port used for the transfer is blocked, or the connection has been aborted mid-transfer. According to your log, it's a block, since the transfer didn't even start (the 256K is only buffer filling). Usually caused by a third-party security software like a firewall doing things it shouldn't.
Response: 226-Error during write to file
Response: 226 Transfer aborted
Additionally, that server is broken and may confuse FTP clients. It gives an error about a transfer abort, together with a success reply-code.
226 is wrong in that case, must be 426.
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