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To:	cygwin AT cygwin DOT com
From:	Mark Hansen <cygwin AT mehconsulting DOT com>
Subject:	sftp hangs when trying to connect to SFTP server
Date:	Sat, 4 Dec 2021 06:35:07 -0800
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Team,

I'm not sure when this started, but I know for sure I was able to do this in the past.

I'm running cygwin on Windows 10 and want to connect to an SFTP server using the 'sftp' command.

Note that when I try to connect to the same SFTP server using a different client, File Zilla, it works.

When I run sftp, it appears to hang. I've run it with -vvvv to get some debugging output and get the following:

1001 jdk16->> sftp -vvvv -P 2100 192.168.160.62
OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data /cygdrive/c/Users/mark.hansen/.ssh/config
debug1: /cygdrive/c/Users/mark.hansen/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 46: Applying options for *
debug2: resolve_canonicalize: hostname 192.168.160.62 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts2'
debug3: ssh_connect_direct: entering
debug1: Connecting to 192.168.160.62 [192.168.160.62] port 2100.
debug3: set_sock_tos: set socket 4 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa type 0
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519 type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: kex_exchange_identification: banner line 0: 220 Welcome to AT FTP service
debug1: kex_exchange_identification: banner line 1: 530 Please login with USER and PASS.

... after some time ...
debug1: kex_exchange_identification: banner line 2: 421 Timeout.
kex_exchange_identification: Connection closed by remote host
Connection closed by 192.168.160.62 port 2100
Connection closed

Here is my local config file (.ssh/config):

Host *
     Protocol 2
     ForwardX11Trusted yes
     ForwardX11 yes

Here is /etc/ssh_config:

Host *
ForwardX11 yes



Yesterday, I upgraded to the latest cygwin packages and now the cygwin DLL is version 3.3.2

I tried running the command with the login user name on the command line (user AT 192 DOT 168 DOT 160 DOT 62) and
assuming it was just waiting for the password, I tried entering it, but the characters were
just echoed to the terminal and the process continued to hang.

Any idea what is causing this? What can I do to troubleshoot this further?


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