I tried to get the files from UNIX to my local Windows machine.
The file contains a word "PASS" .
So when I called : get PASS_123.xml the connection was closing by remote host in 3-4 seconds. Then I renamed the file in UNIX side (PuTTy) -made like "Ppppppp_123.xml" and after that I was able to transfer it .

Seems like some firewall settings or something else not allowed to transfer the files with such word in name. It happens to any files (thousands) containing the "PASS" word in their name. Only for them.
Any ideas?