Issue Anonymous FTP 500 Type Error

[cobanramo]

Server operating system version

VPS Server Ubuntu 24.04.1 LTS

Plesk version and microupdate number

Plesk Obsidian v18.0.66_build1800250106.19 os_Ubuntu 24.04

Hi guys,
When I click on the Anonymous FTP it triggers a 500 Type Error, is this a configuration problem or a bug, can someone help me out?
My configuration is only FTPS and I can connect normally using WinScp and user data.
I've already checked everything with Diagnosis & Repair, but I just can't get any further.

Regards Coban

 

[Sebahat.hadzhi]

I am unable to replicate the issue on a Ubuntu 24.04 server. Have you tried the repair option, please?

 

[cobanramo]

Hello Sebahat,

Of course, first I ran the diagnosis & repair, then later the RepairKit in this error message.
The Plesk installation repair didn't help either.
As soon as this error occurs, there are also a lot of error messages in the log. But there is no malfunction, I don't know what it's all about.
I noticed this problem when I created an FTP user a few days ago, I didn't get around to it before.

Regards R.Sivgin

 

[UHolthausen]

Hello

same problem with debian 12.9 an Plesk Obsidian 18.0.67. Web Pro Edition
Plesk repair doesnt show any problems.

 

[Sebahat.hadzhi]

Could any of you open a support ticket for further investigation, please? The Anonymous FTP is working fine on Ubuntu/Debian when I test it, however, since both of you are experiencing the same issue and you are both on Debian-based systems there might indeed be some sort of compatibility issue. Unfortunately, without investigation it is quite difficult to determine the exact reason for it.

 

[cobanramo]

I've created a ticket, let's see what comes out of it.

Greetings

 

[cobanramo]

So guys,

I had great support from the Plesk team today,
The problem appears to have been temporarily fixed with a patch.
I was informed that the Plesk Development team is aware of the issue and actively working on a permanent fix.
For more details and updates, users can always check the official Plesk changelog here: https://docs.plesk.com/release-notes/obsidian/change-log/

The issue was caused by incorrect handling of IPv6 when enabling Anonymous FTP in Plesk. The key point here is that Plesk does not officially support Anonymous FTP over IPv6.
Because of this, instead of showing a proper message, Plesk was throwing a 500 error when trying to set up Anonymous FTP on an IPv6-enabled domain.
To address this, the Plesk development team has created a bug report: PPPM-14800.

Additionally, if you would like to see official IPv6 support for Anonymous FTP in future Plesk releases, you can submit a feature request here:
UserVoice: Anonymous FTP Access via IPv6
Plesk prioritizes the most popular suggestions, so your feedback is valuable.

So for me the mystery with the error message has been solved for now, as I don't use Anonymous FTP over IPv6 I can live like this until a permanent fix is published.

Thank you for the great support

R.Sivgin