FTP Passive mode problems - debug.pfftpproxy

[MisterDeeds]

Hi

I have a question about the "debug.pfftpproxy" option. As long as this is set "default" all FTP connections without passive mode working normal. Those with passive mode break off after a certain time.
If the value is set to "1", all connection with passive mode working perfectly but all without not anymore.

Summarized:

debug.pfftpproxy          Passive Mode          Active Mode
default                          Not working              Working
1                                    Working                    Not working

Unfortunately, it is imperative to support connections with and without passive mode for me.

Does anyone of you know the problem and can help me?

Thank you and best regards

Lars