I tried several dlls. Im wasnt an expert but now i have got some knowledge about it. I invested about 20 hours on this issue.
It works with some dlls. At the moment i use a dll from WinSCP. Unfortunatelly this one is pretty slow. I still would like to improve the performance. But I either pay 150$ for the dll from chilkat (which works fast and reliable, but is only a 30 days trial.) or i stay with this one that is slow and only works in 50% of the time.
As its very hard to solve this specific problem. I wanted to point out that filezilla doesnt allow me to create folders.
	220 Welcome to the most popular FTP hosting service! Save on hardware, software, hosting and admin. Share files/folders with read-write permission. Visit http://www.drivehq.com/ftp/;
Befehl:	AUTH TLS
Antwort:	234 AUTH Command OK. Initializing TLS connection.
Status:	Initialisiere TLS...
Status:	Überprüfe Zertifikat...
Befehl:	USER CCZeroHour
Status:	TLS/SSL-Verbindung hergestellt.
Antwort:	331 User name ok, need password.
Befehl:	PASS ********
Antwort:	230 User logged on. 
Befehl:	SYST
Antwort:	215 UNIX emulated by DriveHQ FTP Server.
Befehl:	FEAT
Antwort:	211-Extensions supported:
Antwort:	 SIZE
Antwort:	 MLSD
Antwort:	 MLST
Antwort:	 NLST
Antwort:	 MDTM
Antwort:	 MFMT
Antwort:	 MFCT
Antwort:	 MFF Create;Modify;
Antwort:	 REST STREAM
Antwort:	 UTF8
Antwort:	211 END
Befehl:	OPTS UTF8 ON
Antwort:	200 Enable UTF8 mode.
Befehl:	PBSZ 0
Antwort:	200 PBSZ Command OK. Protection buffer size set to 0.
Befehl:	PROT P
Antwort:	200 PROT Command OK.
Status:	Verbunden
Status:	Empfange Verzeichnisinhalt...
Befehl:	PWD
Antwort:	257 "/" is current directory.
Befehl:	TYPE I
Antwort:	200 Type set to I
Befehl:	PASV
Antwort:	227 Entering Passive Mode (66,220,9,51,16,74).
Befehl:	MLSD
Antwort:	150 Connection accepted
Antwort:	226 Transfer complete
Status:	Anzeigen des Verzeichnisinhalts abgeschlossen
Status:	Erstelle Verzeichnis '/Bans'...
Befehl:	MKD Bans
Antwort:	550 Can't create directory. Permission denied.
Befehl:	MKD /Bans
 
 
Another Problem: I have a sub Group user that cant login everytime. Shortly there was a message in Filezilla that there is the need of another deposit. This was not true and some minutes later it worked again. This is a relevant problem for me.