Topic "upgrading server to SFTPv4 protocol?"

Author Message



first thanks for the wonderful software.

a question, when i connect to my server WinSCP reports that i am using "SFTP protocol version 3" which is quite alot slower compared to when using SCP.

i read on the protocols page on this website that SFTP v4 offers major performance improvments in transfer speeds.

how can i upgrade/force my server to use SFTP v4 instead of v3? i am guessing its some setting related to OpenSSH, but i cant figure it out.
[View user's profile]
Site Admin
Joined: 2002-12-10
Posts: 27086
Location: Prague, Czechia
I believe that OpenSSH has only v3 server.

I do not know of any performance benefit between v3 and v4. Where did you read it?
Martin Prikryl

i was refering to this paragraph:

"Transfers are slower in general due to necessity to wait for packet confirmations. Since 3.4 several read/write requestes are issued in parallel, what suppresses the disadvantage significantly"


however upon reading it again, it appears i read it wrong the first time and confused "since 3.4" to be "since 4"

sorry about that Smile

You can post new topics in this forum


What is WinSCP?

It is award-winning SFTP client, SCP client, FTPS client and FTP client integrated into one software program for file transfer to FTP server or secure SFTP server. [More]

And it's free!


About donations

$9   $19   $49   $99

About donations


WinSCP Privacy Policy

WinSCP License