Host is not communicating for more than 15 seconds. Still waiting… Warning: Aborting this operation will close connection!

You get this message when WinSCP is waiting for response from the server for more than configured time. Note that this is not an error message, WinSCP still keeps waiting. If the server responds finally, the message goes away automatically. The message box is shown only to give you a chance to break the connection and reconnect, if you do not want to wait anymore.

If the server never replies, it may be because of some fatal error on the server side. Also something may be interfering with the connection, preventing the server response from arriving or possibly even the original request to arrive at the server.


Persistent problems

If the problem repeats, try turning off Optimize connection buffer size.

In scripting, you can turn off the buffer optimization using SendBuf raw session settings:

open s -rawsettings SendBuf=0

Similarly in WinSCP .NET assembly (a PowerShell example):

$sessionOptions = New-Object WinSCP.SessionOptions
$sessionOptions.AddRawSettings("SendBuf", "0")

Some users also experience this message, when they run out of disk space/quota on the server.

In Other Languages

  • Deutsch – Der entfernte Rechner kommuniziert seit mehr als 15 Sekunden nicht mehr. Warte… Warnung: Der Abbruch dieser Operation beendet die Verbindung!
  • Español – El servidor no se ha comunicado por mas de 15 segundos. Sigo esperando… Aviso: si abortas la operación la sesión se cerrará!
  • Français – L’hôte n’a pas répondu pendant plus de 15 secondes. Toujours en attente… Attention : Annuler cette opération va fermer la connexion !
  • Italiano – L’host non sta comunicando per più di 15 secondi. In attesa… Avviso: Interrompendo questa operazione chiuderai la connessione!

Last modified: by martin