If I don't do anything with WinSCP for several minutes (under 6), then I attempt to do something on the remote host, for example edit a remote file, or change directory to one that hasn't been cached, WinSCP will freeze for 10+ seconds before performing the operation. This only happens for some hosts. It happens on a RHEL AS release 4 (Nahant Update 3), but not on Ubuntu 8.10.
How can I fix this? It's becoming more and more annoying.