Issue After Plesk upgrade FTP storage in Backup manager - curl error (56)

thank you for the reply. After facing a problem with the password and special chars (@ and $) given directly in the password of the command line -> permission denied.
I then tested the behavior to leave the password free in the curl command so that it is asking me later. After entering the password I could then upload the files still with the original password using special chars, but curl error 56. For debugging purpose I removed the special chars in my password. Still the same curl error (56) failed directory listing. Here is the output of curl (I have changed all the personal data)
# curl -v -k --ftp-ssl ftp://example.org//archives/ --user myuser:mysecretpw --upload-file test
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* About to connect() to example.org port 21 (#0)
* Trying 1.1.1.1...
* Connected to example.org (1.1.1.1) port 21 (#0)
< 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
< 220-You are user number 2 of 50 allowed.
< 220-Local time is now 12:27. Server port: 21.
< 220-This is a private system - No anonymous login
< 220-IPv6 connections are also welcome on this server.
< 220 You will be disconnected after 15 minutes of inactivity.
> AUTH SSL
< 500 This security scheme is not implemented
> AUTH TLS
< 234 AUTH TLS OK.
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* skipping SSL peer certificate verification
* SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
* Server certificate:
* REMOVED
> USER myuser
< 331 User myuser OK. Password required
> PASS mysecretpw
< 230-OK. Current restricted directory is /
< 230 0 Kbytes used (0%) - authorized: 307200000 Kb
> PBSZ 0
< 200 PBSZ=0
> PROT P
< 200 Data protection level set to "private"
< 257 "/" is your current location
* Entry path is '/'
> CWD /archives
* ftp_perform ends with SECONDARY: 0
< 250 OK. Current directory is /archives
* Connect data stream passively
< 229 Extended Passive mode OK (|||51340|)
* Trying 1.1.1.1...
* Connecting to 1.1.1.1 (1.1.1.1) port 51340
* Connected to example.org (1.1.1.1) port 21 (#0)
> TYPE I
< 200 TYPE is now 8-bit binary
> STOR test
< 150 Accepted data connection
* Doing the SSL/TLS handshake on the data stream
* skipping SSL peer certificate verification
* SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
* Server certificate:
* REMOVED
} [data not shown]
* We are completely uploaded and fine
* Remembering we are in dir "/archives/"
* response reading failed
100 5 0 0 100 5 0 26 --:--:-- --:--:-- --:--:-- 26
* Connection #0 to host example.org left intact
curl: (56) response reading failed thank you for your hint, but how could this have anything to do with the SSL certificate? On both hosts I use a Lets encrypt certificate which works in both ways (tested with filezilla windows client, and curl on the plesk server shows the right certificate from the ftp host - I removed the data from the log therefore I left "REMOVED")
With filezilla I don't have any problems with directory listing of the ftp storage host (pure-ftpd), after upgrading plesk 12.5 to 17.0.17 I now have a problem with curl on the directory listing, uploading files works with curl at least on command line.
PS: didn't change the SSL certificates.

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