client closed the connection

Hello,

I am trying to upload files, but during the transfer, the client is disconnected. Connection Timeout is set at 60 seconds.
I get the following message when I try to upload files.

SIZE index.htm
550 index.htm: No such file or directory.
PASV
227 Entering Passive Mode (195,241,77,82,165,25)
Opening data connection to 195.241.77.82 Port: 42265
STOR index.htm
5970 bytes transferred. (124 kB/s) (47 ms)
150 Opening BINARY mode data connection to receive index.htm.
Timeout (60s).
Active Help: https://www.smartftp.com/support/kb/45
Client closed the connection.
Transfer successful.

The connection is disconnected. I can reconnect without any problems, and view the files that are on the web server.
The file index.htm which is there is 0 bytes. The index.htm file on my computer is 6kB, so it is not large.

I hope someone can help me.

Thanks !