transfer of large file over slow connections run unnecessary in a timeout.

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bigboss
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Posts:
2
Location:
DE

transfer of large file over slow connections run unnecessary in a timeout.

Steps to reproduce:
- send a large files (~110MB) over a slow connection (home-dsl) via webdav

What happens:
- winscp show "fast" sending and the progressbar will grow until 95-99%.
- transfer in the winscp-gui stalls
- errormessage after 15 seconds (this is the default timeout value)
"Netzwerkfehler: Zeitgrenze für Verbindung „webdav.fqdn.de“ wurde erreicht.
Could not read status line: connection timed out"

At the moment of timeout, the transfer to the server is NOT complete, the destination file (.davfs.tmp1ff369) is about 80 MB.
The temp-file is still growing till the end (~110MB) and will be renamed after this correct. The transfer will complete successful, but WinSCP did not recognise this due the previous timeout.

Workaround 1) Changing timeout to 90 seconds.
WinSCP will wait longer, so the transfer has time to complete, but unfortually this Timeout will also used while creating connections.

Workaround 2) Set the Transferspeed very low and not to "maximum"
Will cause same "progress-state" at sender and reciever, but not the maximum available speed will used.

Client
OS: Windows 10
WinSCP Version 5.19
Transfer via WebDAV and SSL

Server
OS: Debian 10
Apache2, Mods: dav, dav_fs, dav_lock

WinSCP-Serverinfo:
Entferntes System = Apache/2.4.38 (Debian)
Dateiübertragungsprotokoll = WebDAV
Kryptografieprotokoll = TLS/SSL-implizite Verschlüsselung, TLSv1.3
Verschlüsselungsalgorithmus = TLSv1.3: TLS_AES_256_GCM_SHA384, 4096 bit RSA
Komprimierung = Nein
------------------------------------------------------------
Fingerabdruck des Zertifikats
SHA-256 = be:74:c7:ee:74:6c:61:1a:00:5f:77:41:91:03:82:45:d9:9f:3f:d2:25:a1:7c:8d:11:c6:e3:10:66:77:ad:88
SHA-1 = 3a:a4:ec:3a:75:09:01:3f:55:46:d2:5b:00:24:fa:1b:86:de:73:5e
------------------------------------------------------------
Darf Berechtigungen ändern = Nein
Darf Besitzer/Gruppe ändern = Nein
Darf beliebige Befehle ausführen = Nein
Darf symbolische/harte Verknüpfung erzeugen = Nein/Nein
Darf Benutzergruppen herausfinden = Nein
Darf entfernte Dateien duplizieren = Ja
Darf verfügbaren Platz ermitteln = Ja
Darf Dateiprüfsumme berechnen = Nein
Native ASCII-Textmodus-Übertragungen = Nein
------------------------------------------------------------
Zusätzliche Informationen
Der Server unterstützt diese WebDAV-Erweiterungen:
  1, 2, <http://apache.org/dav/propset/fs/1>
------------------------------------------------------------
Gesamter Speicher auf Gerät = Unbekannt
Freier Speicher auf Gerät = Unbekannt
Gesamter Speicher für Benutzer = Unbekannt
Freier Speicher für Benutzer = Unbekannt
Bytes pro Zuordnungseinheit = Unbekannt
Description: Apache Serverlogfile
Description: Winscp GUI Logfile

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martin
Site Admin
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Prague, Czechia

Re: transfer of large file over slow connections run unnecessary in a timeout.

Thanks for your report. What do you propose? A separate timeout for the upload, different from the connection timeout?

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bigboss
Joined:
Posts:
2
Location:
DE

Hi Martin,
thank you for your reply.

Best would be, you can monitor the running transfer and dont run into any timeout value during this. But I dont know, if this is technical possible.

Maybe reducing the transferbuffer will help?

If this two options are not possible, a second timeout-value "waiting to complete transfer" would be nice.

Kind Regards
Norman

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martin
Site Admin
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Imo, what happens is that complete file is buffered somewhere on the way between WinSCP and the server (or even on the server itself). So from WinSCP perspective, the transfer is done and the server is not responding for too long. I do not think that there's a way for WinSCP to distinguish this situation as "running transfer" as opposite to server failing to respond.

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