![]() (Other types of periodic network activity can cause this behavior in particular, re-keys can have this effect.) 2 Answers 2 Sorted by: Keepalives can make this sort of problem worse, because they increase the probability that WinSCP will attempt to send data during a break in connectivity. Then when connectivity is restored, the other side will find that the first side doesn’t believe there is an open connection any more. However, if one side does send something during the break, it will repeatedly try to re-send, and eventually give up and abandon the connection. If a session is idle, and connectivity is temporarily lost between the endpoints, but the connectivity is restored before either side tries to send anything, then there will be no problem – neither endpoint will notice that anything was wrong. They help if you have a firewall which drops your connection after an idle period but if the network between you and the server suffers from breaks in connectivity then keepalives can actually make things worse. Note that keepalives are not always helpful. This period is defined with Seconds between keepalives. In the Keepalives box, you may order WinSCP to send some dummy data in regular periods to avoid being disconnected. ![]() 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. If you provide a hostname, it will see what kinds of address exist for that hostname it will use IPv6 if there is an IPv6 address available, and fall back to IPv4 if not.) ![]() ![]() (If you specify a literal Internet address, it will use whichever protocol that address implies. The default setting is Auto, which means WinSCP will do something sensible and try to guess which protocol you wanted. ![]() This option allows the user to select between the old and new Internet protocols and addressing schemes (IPv4 and IPv6). ![]()
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