Issue BUG Plesk 18.0.77 - FTP backups no longer work

[jfh]

Since version 18.0.77, FTP backups no longer work, displaying the following error message:

Could not display the list of backups in the FTP Storage: Unable to get ftp dumps list: FTP network error: Transport error: unable to list directory

We have check with the command curl -v --ftp-pasv --ssl -k and everything is fine

 

[Sebahat.hadzhi]

Hi, @jfh . Could you please provide your OS and confirm the exact Remote FTP settings in Tools & Settings Backup Manager > Remote Storage settings. Also, can you please confirm the full error message you encounter? Thank you in advance.

 

[jfh]

Hi, @jfh . Could you please provide your OS and confirm the exact Remote FTP settings in Tools & Settings Backup Manager > Remote Storage settings. Also, can you please confirm the full error message you encounter? Thank you in advance.

Hi, The OS is Debian other informations in Attache files. The curl command works.

 

[Sebahat.hadzhi]

Thank you. Could you please also confirm:

1. The Debian version
2. What's the exact output when you execute the curl request from the error message
3. What FTP service does your remote server use

Thanks in advance.

 

[jfh]

Thank you. Could you please also confirm:

1. The Debian version
2. What's the exact output when you execute the curl request from the error message
3. What FTP service does your remote server use

Thanks in advance.

1. The Debian version :
Debian 10.13

2. What's the exact output when you execute the curl request from the error message
* TCP_NODELAY set
* Connected to srv-XXXX.XXXXXXX.ovh (XX.XX.XX.XX) port 21 (#0)
< 220 (vsFTPd 3.0.3)
> AUTH SSL
< 234 Proceed with negotiation.
* successfully set certificate verify locations:
* CAfile: none
CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Request CERT (13):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS handshake, Certificate (11):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
* subject: CN=ns3164682.ip-51-89-98.eu
* start date: Jan 4 13:30:40 2022 GMT
* expire date: Jan 2 13:30:40 2032 GMT
* issuer: CN=ns3164682.ip-51-89-98.eu
* SSL certificate verify result: self signed certificate (18), continuing anyway.
> USER saveplesk
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< 331 Please specify the password.
> PASS Jk_ui095-36Gg
< 230 Login successful.
> PBSZ 0
< 200 PBSZ set to 0.
> PROT P
< 200 PROT now Private.
> PWD
< 257 "/" is the current directory
* Entry path is '/'
> CWD srv-admr2
* ftp_perform ends with SECONDARY: 0
< 250 Directory successfully changed.
> CWD admr.org
< 250 Directory successfully changed.
> EPSV
* Connect data stream passively
< 229 Entering Extended Passive Mode (|||10105|)
* Trying XX.XX.XX.XX...
* TCP_NODELAY set
* Connecting to XX.XX.XX.XX (XX.XX.XX.XX) port 10105
* Connected to srv-XXXX.XXXXXXX.ovh (XX.XX.XX.XX) port 21 (#0)
> TYPE A
< 200 Switching to ASCII mode.
> LIST
< 150 Here comes the directory listing.
* Maxdownload = -1
* Doing the SSL/TLS handshake on the data stream
* successfully set certificate verify locations:
* CAfile: none
CApath: /etc/ssl/certs
* SSL re-using session ID
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
* subject: CN=ns3164682.ip-51-89-98.eu
* start date: Jan 4 13:30:40 2022 GMT
* expire date: Jan 2 13:30:40 2032 GMT
* issuer: CN=ns3164682.ip-51-89-98.eu
* SSL certificate verify result: self signed certificate (18), continuing anyway.
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
-rw-r--r-- 1 1001 1001 2353547219 Mar 04 22:36 backup_XXXXXXXXXXXX.tar

* TLSv1.3 (IN), TLS alert, close notify (256):
* Remembering we are in dir "srv-admr2/admr.org/"
* TLSv1.3 (OUT), TLS alert, close notify (256):
< 226 Directory send OK.
* Connection #0 to host srv-XXXX.XXXXXXX.ovh left intact

3. What FTP service does your remote server use
vsftpd

 

[EstablishedDiscover]

I am experiencing a similar issue with FTPS with Passive Mode since upgrading Plesk. The error "TLS session of data connection not resumed" is reported in the FileZilla logs.

Previously, we encountered an issue configuring FTPS backup and resolved it by adding the setting "ftpForbidReuseConnection = 1" to the panel.ini file, as referenced in the following thread:
Resolved - plesk Backup Tool - FTP mode

I have since tried removing this setting, but the issue persists.

If I disable FTPS, the backups complete successfully.

1. The Debian version
Debian 11.11
2. What's the exact output when you execute the curl request from the error message
Enter host password for user 'test':
* Trying x.x.x.x:21...
* Connected to x.x.com (x.x.x.x) port 21 (#0)
< 220-FileZilla Server 1.12.5
< 220 Please visit FileZilla - The free FTP solution
> AUTH SSL
< 234 Using authentication type TLS.
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
* CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
* subject: C=XX; ST=XX; L=XX; O=ABC; OU=ABC FTP; CN=x.x.com
* start date: Apr 13 14:47:37 2026 GMT
* expire date: Apr 10 14:47:37 2036 GMT
* issuer: C=XX; ST=XX; L=XX; O=ABC; OU=ABC FTP; CN=x.x.com
* SSL certificate verify result: self signed certificate (18), continuing anyway.
> USER test
< 331 Please, specify the password.
> PASS klse1005
< 230 Login successful.
> PBSZ 0
< 200 PBSZ=0
> PROT P
< 200 Protection level set to P
> PWD
< 257 "/" is current directory.
* Entry path is '/'
* Request has same path as previous transfer
> EPSV
* Connect data stream passively
* ftp_perform ends with SECONDARY: 0
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
< 229 Entering Extended Passive Mode (|||51055|)
* Trying x.x.x.x:51055...
* Connecting to x.x.x.x (x.x.x.x) port 51055
* Connected to x.x.com (x.x.x.x) port 21 (#0)
> TYPE A
< 200 Type set to A
> LIST
< 150 Starting data transfer.
* Maxdownload = -1
* Doing the SSL/TLS handshake on the data stream
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
* CApath: /etc/ssl/certs
* SSL re-using session ID
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
* subject: C=XX; ST=XXX; L=XXXXX; O=ABC; OU=ABC FTP; CN=x.x.com
* start date: Apr 13 14:47:37 2026 GMT
* expire date: Apr 10 14:47:37 2036 GMT
* issuer: C=XX; ST=XXX; L=XXXXX; O=ABC; OU=ABC FTP; CN=x.x.com
* SSL certificate verify result: self signed certificate (18), continuing anyway.
* TLSv1.3 (IN), TLS alert, close notify (256):
* Remembering we are in dir ""
* TLSv1.3 (OUT), TLS alert, close notify (256):
< 226 Operation successful
* Connection #0 to host x.x.com left intact
3. What FTP service does your remote server use
FileZilla Server 1.12.5