Differences
This shows you the differences between the selected revisions of the page.
| 2015-06-10 | 2016-01-13 | ||
| Restored revision 1433952573. Undoing revision 1433952586. (martin) (hidden) | removing obsolete references to ssh-1 (martin) | ||
| Line 24: | Line 24: | ||
| Some servers (and also firewalls and routers on the way between the client and the server) disconnect clients if they do not receive any data from it within a defined period. In the //Keepalives// box, you may order WinSCP to send some dummy data in regular periods to avoid being disconnected. This period is defined with //Seconds between keepalives//. | Some servers (and also firewalls and routers on the way between the client and the server) disconnect clients if they do not receive any data from it within a defined period. In the //Keepalives// box, you may order WinSCP to send some dummy data in regular periods to avoid being disconnected. This period is defined with //Seconds between keepalives//. | ||
| - | WinSCP implements two methods for keepalives. For SFTP and SCP, the basic option is to send SSH-level keepalives implemented by null SSH packets (SSH ignore messages). Some servers may be configured not to count these packets as data and thus they will still disconnect clients sending them. Also if you use SSH-1 and your server suffers [[ui_login_bugs#chokes_on_ssh-1_ignore_messages|"SSH-1 ignore message" bug]], this method will not work. | + | WinSCP implements two methods for keepalives. For SFTP and SCP, the basic option is to send SSH-level keepalives implemented by null SSH packets (SSH ignore messages). Some servers may be configured not to count these packets as data and thus they will still disconnect clients sending them. |
| As an alternative WinSCP can send dummy commands of the transfer protocol instead. For SFTP it is implemented as canonization of path ''/''. For SCP it is implemented as ''echo'' command.((With SCP this keepalive method does not work while WinSCP waits for user prompt in the middle of file transfer.)) For FTP it is the only option and is implemented as randomly selected FTP protocol command with no effect. | As an alternative WinSCP can send dummy commands of the transfer protocol instead. For SFTP it is implemented as canonization of path ''/''. For SCP it is implemented as ''echo'' command.((With SCP this keepalive method does not work while WinSCP waits for user prompt in the middle of file transfer.)) For FTP it is the only option and is implemented as randomly selected FTP protocol command with no effect. | ||