Wing FTP Software

Attempting to log into the ftp server using sftp does not work for some OS versions. Not working includes:

Mac OS X 10.11.1
Fedora 23
Ubuntu 14

Working includes:

Mac OS X 10.9.5
CentOS 6
CentOS 7
Ubuntu 12
Suse 11

On a Mac the error looks like the following (with user names, IPs, and domains replaced):

$ sftp -v -o IdentityFile=XXX <user@site>
OpenSSH_6.9p1, LibreSSL 2.1.7
debug1: Reading configuration data <...>/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug1: Connecting to <site> [X.X.X.X] port 22.
debug1: Connection established.
debug1: identity file <file> type 1
debug1: key_load_public: No such file or directory
debug1: identity file <file> type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
debug1: Remote protocol version 2.0, remote software version WeOnlyDo-WingFTP
debug1: no match: WeOnlyDo-WingFTP
debug1: Authenticating to <site>:22 as '<user>'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-sha1 none
debug1: kex: client->server aes128-cbc hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<7680<8192) sent
Received disconnect from X.X.X.X: 2: Handshake failed
Disconnected from X.X.X.X
Connection closed


The same pattern is seen on Fedora 23.

The server does not show anything interesting in the log, just a message like:

[02] Thu, 19 Nov 2015 15:05:59 (0941580) Connected from 38.106.199.6 (local address 10.187.62.79, port 22)
[01] Thu, 19 Nov 2015 15:05:59 (0941580) SSH session receive user name:<user>
[01] Thu, 19 Nov 2015 15:05:59 (0941580) SSH session receive password of user <user>
[01] Thu, 19 Nov 2015 15:05:59 (0941580) Failed in public key authentication.
[02] Thu, 19 Nov 2015 15:06:00 (0941580) Closed session,disconnected from 38.106.199.6. The reason is:Unable to complete handshake.

Already tested it with Ubuntu 14.04, everything worked fine, so do you have any special SSH configuration?

I do not currently have access to an Ubuntu 14 system. I do have access to OS X 10.11.1 and Fedora 23 systems that show the exact failure. Fedora 22 also show the same problem. Fedora 21 does not.

I do not know of any ssh configurations that would affect what appears to be a disconnect from the server. Can you suggest any to look at?

I can confirm that Ubuntu 14 does work. That gives:

Not working:

Mac OS X 10.11.1
Fedora 22
Fedora 23

Working:

Mac OS X 10.9.5
CentOS 6
CentOS 7
Ubuntu 12
Ubuntu 14
Suse 11

OK, it seems Ubuntu 15 has the similar issue like you said, it is caused by the maximum public-key component size, and we will fix it in the next release, thanks for your report!

I'm currently also running into this problem, connecting to Wing FTP Server using scp from an Ubuntu machine.
Is there a workaround, as I have no control over server upgrades whatsoever?

Thanks!

OK, WingFTP does not support SCP protocol, please use SFTP instead.

FTP wrote:OK, WingFTP does not support SCP protocol, please use SFTP instead too.

D'oh, I've been trying to use the SCP protocol all this time. It worked after using SFTP. Glad I saw your post.