It seems you need to ask the system manager of the server to open another port. If the advantages are clear enough he might do it.
But since you describe the server as "my server" you can do it yourself, can't you?
Once you did it, it would be interesting to know if your friend is right. Can you tell the average time needed for 10 normal ftp-transfers and 10 transfers via this program?
My friend told me that GbCopy can transfer large file faster than FTP, I tried copy file 10GB from my laptop to server but i faced problem when run it. When i follow userguide of GBCopy at gbcopy.misamap.com/2013/06/user-guide.html, I still cannot copy. My server only open port 80, 21 and 22.
Can you help me solve this problem?
Thank you in advance.