The server rejected SFTP connection, but it listens for FTP connections.

Im using built 7781. I started having this error since last winscp update.
I verified that my server uses port 22 for sftp.
I tried to connect using filezilla, which works fine

Here is the details of the problem:

It gives the following error
in two situations:

1. When trying to connect initially. It might give the error 20 times in a line and then allow to connect or it might connect immediately without any error.
2. When trying to transfer files. After clicking the OK button for 20-30 times files get transfered somehow

update to my previous post.
Sometimes when trying to transfer files it gives "Network error..." message

Please attach a full session log file showing the problem (using the latest version of WinSCP). As well as FileZilla verbose log file (not the message log from the GUI).

I started having this error since last winscp update.

If you downgrade, does the problem resolve?

Dear support,

I'm using WinSCP 5.11.3 (Build 7995) on Windows 7

Use it to connect to UBUNUTU Server 16.04 with UFW enabled: works perfect!

Try to use it for another machine, running Linux Mint 18.2 (updated!)
This machine has:
- UFW: inactive (so no firewall)
- running lighttpd for playing around with PI-Hole (so that runs as well)
- OpenSSH running

SFTP connection refused, switching to FTP did not help: similar problem. See attached LOG

HansTroost wrote:

Dear support,

I'm using WinSCP 5.11.3 (Build 7995) on Windows 7

Use it to connect to UBUNUTU Server 16.04 with UFW enabled: works perfect!

Try to use it for another machine, running Linux Mint 18.2 (updated!)
This machine has:
- UFW: inactive (so no firewall)
- running lighttpd for playing around with PI-Hole (so that runs as well)
- OpenSSH running

SFTP connection refused, switching to FTP did not help: similar problem. See attached LOG

Can you connect with any other SFTP or FTP client?

martin wrote:

Can you connect with any other SFTP or FTP client?

First of all: Happy 2018! And thanks for replying.

Followed your suggestion: with other tools: similar problems.
Possibly my OpenSSH-server-installation was not configured well or something else. Re-installed it and now everything works fine.

My apologies for asking before I tried everything else: I'm relatively new to all this stuff: have end-user experience with linux, but now since some weeks experimenting with setting up web-servers on linux, configuring firewalls etc.

HansTroost wrote:

martin wrote:

Can you connect with any other SFTP or FTP client?

First of all: Happy 2018! And thanks for replying.

Followed your suggestion: with other tools: similar problems.
Possibly my OpenSSH-server-installation was not configured well or something else. Re-installed it and now everything works fine.

My apologies for asking before I tried everything else: I'm relatively new to all this stuff: have end-user experience with linux, but now since some weeks experimenting with setting up web-servers on linux, configuring firewalls etc.

I have to login to give my thanks to you. You help me out a lot when I get lost. Thanks so much, bro.

Use "enp2s0" for ubuntu 16.04 LTS
it worked for me ! Thanks

Please remember to do this on the ubuntu server

sudo apt install openssh-server