I had an issue simular to this not long ago. Might try this:
I have found a write up on McAfee. If states that if you make the request in the format below it will work.
yes, i solved this autentification problem but what i am trying to do is use the windows explorer to open the ftp for upload files like a windows folder but always send me to internet explorer, i cant use the comand lines (cmd) or a client because doesn't connect
thanks for answer
According to my information you won´t be able to use the Windows Explorer for uploading files. What we basically do as a proxy here is creating an FTP connection to the destination server, retrieve the contents, generate a HTML page which shows the content, and present this to the end user.
If there is no proxy in between Internet Explorer is capable of switching to Windows Explorer and allow full FTP access - this won´t work through a proxy.
If Uploads are required I think you will need to utilize the "native FTP Proxy", which is part of MWG and - by default - running on port 2121. You need to tell FileZilla that you need a Proxy to connect to the Internet. Maybe you want to look into this thread:
This will allow you to upload files via FTP.
Asabban thanks, it works properly, configure the client proxy and put the user authentication data.