FTP Connexion after changing internet provider

Hello,

I am using OMV6 at home. I use the FTP plugin to automatically backup data from a website.

I redirected port 21 on my router and it worked perfectly until I changed my internet connexion from ADSL to optical fiber. I did not change my router so the configuration stay the same, but my public IP address changed.

Since, I can login using filezilla when I am at home, but from outside it is not working anymore even I use the new IP address.

Here is Filezilla messages when I try to connect (translated from french):

Status: Connecting to XX.XX.XX.XX:21…
Status: Connection established, waiting for the welcome message…
Status: Server not secure, it does not support FTP over TLS.
Status: Connected
Status: Retrieving folder contents…
Command: PWD
Answer: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Response: 227 Entry into passive mode (XX.XX.XX.XX,206,49).
Command: MLSD
Error: Connection dropped after 20 seconds of inactivity
Error: Failed to retrieve folder contents
Status: Disconnected from server

Thank you in advance for your help

Thank you for your answer Chente.

I checked using the command pronpt tracert + my IP and have just a single hop so it seams my ISP doesn't use CGNAT.

Do you have any other ideas?

PS. I did not mention it in my first post, but I also have have Nextcloud and Plex in OMV docker that works perfectly with the port forwarding even now.

Thank you Soma.

I just tried to change the external port from 21 to 5021 without success.

I noticed that it works when I try to login from my local network using the public IP address as host, but not when I am out for my local network.

I tried in normal and passive mode with the same result.

Here is the last attempt report from the website backup app (translated from french)

[17-May-2023 12:01:22] 1. Attempting to upload backup to FTP server…
[17-May-2023 12:01:28] Connected to FTP server: XXX.XXX.XX.XX:5021
[17-May-2023 12:01:28] FTP client command: USERS sites
[17-May-2023 12:01:28] FTP server response: Connected user sites.
[17-May-2023 12:01:28] FTP client command: SYST
[17-May-2023 12:01:28] Replica FTP server: UNIX
[17-May-2023 12:01:28] The current FTP folder is: /
[17-May-2023 12:01:28] FTP client command: PASV
[17-May-2023 12:01:28] Replica FTP server: Switch to normal mode
[17-May-2023 12:01:28] Start of FTP transfer…
[May-17-2023 12:01:28] WARNING: ftp_nb_fput(): bind() failed: permission denied (13)
[17-May-2023 12:01:28] WARNING: ftp_nb_fput(): /2023-05-17_11-58-43_I7U4KC1152Q1.zip: No such file or folder
[17-May-2023 12:01:28] ERROR: Unable to transfer backup to FTP server!

Thank you for your help

I just tried to entrer my public IP adrress and the FTP port number in a browser using another network and got this answer

220 ProFTPD Server ready.

I wander if it not due to a setting in my OMV config but I did not change it.

Here a screenshot of my FTP config

Zitat von Soma

I don't use FTP so will not be able to provide more help.

The port change was just an idea.

Unfortunately it didn't solved it.

Maybe someone else can give other pointers.

Thank you Soma for your try.

Thank you for your help

I finally solved the problem.

My new provider allowed prot range is shorter than the previous, I edited the passive min and max ports in OMV config and it works now.