Restoring a session with multiple sftp connections to the same host leads to an IP ban by CSF/LFD. This is due to the fact that apparently (probably?) an sftp connection on konqueror attempts a passwordless connection, and *then* it prompts for the password/passkey.. but registering that first one as a failed attempt, and if you have more sftp connections attempted than the server's limit (I think the default is 5) your ip gets banned. konqueror should therefore re-use the first established sftp connection (and only attempt one at a time) instead of trying a new one for each view. Another related issue is that this then often causes the kio_sftp socket used by konq to not work anymore, and the workaround I have found is to launch dolphin (which seems unaffected by the frozen kio socket) and attempt the sftp connection there, and then it "magically" works in konqueror. Killing the > /usr/libexec/kf5/kioslave5 /usr/lib64/qt5/plugins/kf5/kio/sftp.so sftp processes does not seem to work either. But I think I had luck once killing the > /usr/libexec/kf5/kiod5 process after killing all the sftp kioslave processes. But I'm not sure if it was due to special circumstances or what. In case that is useful information.