pure-ftpd passive mode fail

Hi.
I was setting pure-ftpd to work in passive mode, but its impossible to do, since something is changing pure-ftpd.conf to its original state.

I have described issue here
http://support.ajenti.org/topic/572031-ftp-server-errors-out/

In two words,
/etc/pure-ftpd/pure-ftpd.conf is being changed to its original state, and it must contain
PassivePortRange 30000 35000 lines to make passive mode work correctly.
Since i'm changing it mannually, it works, but after some time file is being replaced by some process, and passive mode stops working.

What can be done to fix it permanently?

edit:/ testing chattr +i /etc/pure-ftpd/pure-ftpd.conf
not sure it will help


Have figured out what chenges this file.

When i'm editing a website in ajenti panel and press Apply Changes, it changes that file.
But since i have locked it from changes, i'm recieving an error.

[Errno 13] Permission denied: '/etc/pure-ftpd/pure-ftpd.conf' Traceback (most recent call last):   File "/usr/lib/python2.6/site-packages/ajenti/plugins/main/main.py", line 158, in handle_message     self.ui.dispatch_event(update['uid'], update['event'], update['params'])   File "/usr/lib/python2.6/site-packages/ajenti/ui/__init__.py", line 72, in dispatch_event     self.root.dispatch_event(uid, event, params)   File "/usr/lib/python2.6/site-packages/ajenti/ui/element.py", line 382, in dispatch_event     if child.dispatch_event(uid, event, params):   File "/usr/lib/python2.6/site-packages/ajenti/ui/element.py", line 382, in dispatch_event     if child.dispatch_event(uid, event, params):   File "/usr/lib/python2.6/site-packages/ajenti/ui/element.py", line 388, in dispatch_event     getattr(self, k)(**(params or {}))   File "/var/lib/ajenti/plugins/vh/main.py", line 257, in save     self.manager.update_configuration()   File "/var/lib/ajenti/plugins/vh/api.py", line 300, in update_configuration     self.__runall([(c.create_configuration, [self.config]) for c in self.components])   File "/var/lib/ajenti/plugins/vh/api.py", line 296, in __runall     raise g.exception IOError: [Errno 13] Permission denied: '/etc/pure-ftpd/pure-ftpd.conf'

My solution was editing:

/var/lib/ajenti/plugins/vh-pureftpd/
pureftpd.py
pureftpd.pyc
I've added PassivePortRange 30000 35000 to config section, restarted ajenti, and now it works by default.