Version 4.0 of Xceed FTP for .NET features performance enhancements that eliminate certain problems related to connecting to a server residing behind a firewall. The addition of the CCC (clear command channel) command and the UseRemoteAddress property resolves this issue.

Furthermore, internal architecture changes have been made that will eliminate hanging or small files being empty after transfer in certain situations. 

Finally, various enumerations have been modified to match those found in the .NET Framework.