Hi, I am having the same problem with pretty much the same environment. We're running version 0.10 of Net::SFTP and version 1.30 of Net::SSH::Perl. The server we're connecting to is a "5.0.0.844 SSH Tectia Server", with protocol version 2.0. Have you figured out why changing the COPY_SIZE made it work? Also, before I made the change, Put was hanging but Get was working fine. Strange isn't it? Franky