Hi Bonghwan,
Which component are you using wodFtpDLX ActiveX component or wodFtpDLX.NET component?
I just preform test using our testing Solaris server and it worked for me without any problem.
Is there any chance we can connect to your server and duplicate your problem? We will just connect few times duplicate it and immediately disconnect.
If this is not possible can you maybe send us output from ListItems Event?
You can send your server login information or raw listing output to:
techsupport@weonlydo.com
Drazen