The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

  • My badges

  • Twitter Updates

  • My Flickr Stream

  • Pages

  • All categories

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 2,422 other followers

Filezilla: figuring out the cause of “Connection timed out after 20 seconds of inactivity”

Posted by jpluimers on 2021/07/21

On one of my Raspberry Pi boxes, somehow I could not access files over SFTP (SSH File Transfer Protocol) via FileZilla.

I would consistently get this error:

"Connection timed out after 20 seconds of inactivity"

Figuring the exact cause took a while.

TL;DR: SFTP uses an interactive non-login shell, then interprets the output from that shell. For that kind of shell, ensure few or none scripts run that output text.

These links finally got me to the cause

These helped me solve the cause

This solved my problem

This is what my /etc/bash.bashrc.local looked like:

# /etc/bash.bashrc.local for SUSE Linux
#
# PLEASE DO NOT CHANGE /etc/bash.bashrc There are chances that your changes
# will be lost during system upgrades.  Instead use /etc/bash.bashrc.local
# for bash or /etc/ksh.kshrc.local for ksh or /etc/zsh.zshrc.local for the
# zsh or /etc/ash.ashrc.local for the plain ash bourne shell  for your local
# settings, favourite global aliases, VISUAL and EDITOR variables, etc ...

. /etc/bash.aliases/_load-aliases.sh

#
# End of /etc/bash.bashrc.local
#

This is what it looks like now:

# /etc/bash.bashrc.local for SUSE Linux
#
# PLEASE DO NOT CHANGE /etc/bash.bashrc There are chances that your changes
# will be lost during system upgrades.  Instead use /etc/bash.bashrc.local
# for bash or /etc/ksh.kshrc.local for ksh or /etc/zsh.zshrc.local for the
# zsh or /etc/ash.ashrc.local for the plain ash bourne shell  for your local
# settings, favourite global aliases, VISUAL and EDITOR variables, etc ...

if [ "$SSH_TTY" ]
then
   source /etc/bash.aliases/_load-aliases.sh
fi

#
# End of /etc/bash.bashrc.local
#

–jeroen

Documentation

Error situation for SFTP

FileZilla SFTP login 1

Status:      	Disconnected from server
Trace:       	CControlSocket::DoClose(66)
Trace:       	CControlSocket::ResetOperation(66)
Trace:       	CFileZillaEnginePrivate::ResetOperation(66)
Trace:       	CControlSocket::DoClose(66)
Trace:       	CControlSocket::DoClose(66)
Trace:       	CFileZillaEnginePrivate::ResetOperation(0)
Status:      	Connecting to 192.168.124.38...
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 0
Trace:       	Going to execute /Applications/FileZilla.app/Contents/MacOS/fzsftp
Response: 	fzSftp started, protocol_version=8
Trace:       	CSftpDeleteOpData::ParseResponse() in state 0
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 3
Command:	open "jeroenp@192.168.124.38" 22
Trace:       	Connecting to 192.168.124.38 port 22
Trace:       	We claim version: SSH-2.0-FileZilla_3.39.0
Trace:       	Server version: SSH-2.0-OpenSSH_7.7
Trace:       	Using SSH protocol version 2
Trace:       	Doing ECDH key exchange with curve Curve25519 and hash SHA-256
Trace:       	Server also has ssh-rsa host key, but we don't know it
Trace:       	Host key fingerprint is:
Trace:       	ssh-ed25519 256 74:61:ab:6c:36:af:b6:5c:ee:7c:05:5e:a6:89:02:bb SbjJxfUHIU462/C/8lUoPrQORorrIh5senJFBeIIzMc=
Trace:       	Initialised AES-256 SDCTR client->server encryption
Trace:       	Initialised HMAC-SHA-256 client->server MAC algorithm
Trace:       	Initialised AES-256 SDCTR server->client encryption
Trace:       	Initialised HMAC-SHA-256 server->client MAC algorithm
Trace:       	Pageant is running. Requesting keys.
Trace:       	Pageant has 0 SSH-2 keys
Trace:       	Attempting keyboard-interactive authentication
Trace:       	Using keyboard-interactive authentication. inst_len: 0, num_prompts: 1
Command:	Pass: *************
Trace:       	Access granted
Trace:       	Opening session as main channel
Trace:       	Opened main channel
Trace:       	Started a shell/command
Status:      	Connected to 192.168.124.38
Error:        	Connection timed out after 20 seconds of inactivity
Trace:       	CControlSocket::DoClose(2050)
Trace:       	CControlSocket::ResetOperation(2114)
Trace:       	CSftpDeleteOpData::Reset(2114) in state 3
Error:        	Could not connect to server
Trace:       	CFileZillaEnginePrivate::ResetOperation(2114)
Status:      	Waiting to retry...
Trace:       	CControlSocket::DoClose(66)
Trace:       	CControlSocket::DoClose(66)
Status:      	Connecting to 192.168.124.38...
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 0
Trace:       	Going to execute /Applications/FileZilla.app/Contents/MacOS/fzsftp
Response: 	fzSftp started, protocol_version=8
Trace:       	CSftpDeleteOpData::ParseResponse() in state 0
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 3
Command:	open "jeroenp@192.168.124.38" 22
Trace:       	Connecting to 192.168.124.38 port 22
Trace:       	We claim version: SSH-2.0-FileZilla_3.39.0
Trace:       	Server version: SSH-2.0-OpenSSH_7.7
Trace:       	Using SSH protocol version 2
Trace:       	Doing ECDH key exchange with curve Curve25519 and hash SHA-256
Trace:       	Server also has ssh-rsa host key, but we don't know it
Trace:       	Host key fingerprint is:
Trace:       	ssh-ed25519 256 74:61:ab:6c:36:af:b6:5c:ee:7c:05:5e:a6:89:02:bb SbjJxfUHIU462/C/8lUoPrQORorrIh5senJFBeIIzMc=
Trace:       	Initialised AES-256 SDCTR client->server encryption
Trace:       	Initialised HMAC-SHA-256 client->server MAC algorithm
Trace:       	Initialised AES-256 SDCTR server->client encryption
Trace:       	Initialised HMAC-SHA-256 server->client MAC algorithm
Trace:       	Pageant is running. Requesting keys.
Trace:       	Pageant has 0 SSH-2 keys
Trace:       	Attempting keyboard-interactive authentication
Trace:       	Using keyboard-interactive authentication. inst_len: 0, num_prompts: 1
Command:	Pass: *************
Trace:       	Access granted
Trace:       	Opening session as main channel
Trace:       	Opened main channel
Trace:       	Started a shell/command
Status:      	Connected to 192.168.124.38
Error:        	Connection timed out after 20 seconds of inactivity
Trace:       	CControlSocket::DoClose(2050)
Trace:       	CControlSocket::ResetOperation(2114)
Trace:       	CSftpDeleteOpData::Reset(2114) in state 3
Error:        	Could not connect to server
Trace:       	CFileZillaEnginePrivate::ResetOperation(2114)

Interactive login 1

Last login: Sun Aug  4 09:44:00 2019 from 192.168.171.24
/etc/bash.aliases ~
/etc/bash.aliases:
fatal: not a git repository: /etc/bash.aliases/../.git/modules/bash.aliases
~
/etc ~
/etc:
fatal: not a git repository (or any of the parent directories): .git
~
Started loading aliases from DIR=/etc/bash.aliases
  Created alias tmux-attach-or-create-main-session=tmux new-session
  More tmux and screen tips: http://www.dayid.org/comp/tm.html
  detach from currently attached session	tmux:	^b d OR ^b :detach	                screen:	^a ^d OR ^a :detach
  list sessions	                        tmux:	^b s OR tmux ls OR tmux list-sessions	screen:	screen -ls
  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-a  Finished _various_aliases.sh apache-aliases.sh bind-named-aliases.sh certbot-aliases.sh filesystem-aliases.sh git-aliases.sh logrotate-aliases.sh network-aliases.sh postfix-aliases.sh sendmail-aliases.sh ssh-aliases.sh ssl-aliases.sh whatismyip-hostname-aliases.sh zypper-aliases.sh
Finished loading aliases

Commented out anything in /etc/bash.bashrc.local

Interactive login 2

jeroenp@katrien
Password: 
Last login: Sun Aug  4 10:06:25 2019 from 192.168.171.24

FileZilla SFTP login 2

Status:      	Disconnected from server
Trace:       	CControlSocket::DoClose(66)
Trace:       	CControlSocket::DoClose(66)
Trace:       	CControlSocket::DoClose(66)
Trace:       	CFileZillaEnginePrivate::ResetOperation(0)
Status:      	Connecting to 192.168.124.38...
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 0
Trace:       	Going to execute /Applications/FileZilla.app/Contents/MacOS/fzsftp
Response: 	fzSftp started, protocol_version=8
Trace:       	CSftpDeleteOpData::ParseResponse() in state 0
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpDeleteOpData::Send() in state 3
Command:	open "jeroenp@192.168.124.38" 22
Trace:       	Connecting to 192.168.124.38 port 22
Trace:       	We claim version: SSH-2.0-FileZilla_3.39.0
Trace:       	Server version: SSH-2.0-OpenSSH_7.7
Trace:       	Using SSH protocol version 2
Trace:       	Doing ECDH key exchange with curve Curve25519 and hash SHA-256
Trace:       	Server also has ssh-rsa host key, but we don't know it
Trace:       	Host key fingerprint is:
Trace:       	ssh-ed25519 256 74:61:ab:6c:36:af:b6:5c:ee:7c:05:5e:a6:89:02:bb SbjJxfUHIU462/C/8lUoPrQORorrIh5senJFBeIIzMc=
Trace:       	Initialised AES-256 SDCTR client->server encryption
Trace:       	Initialised HMAC-SHA-256 client->server MAC algorithm
Trace:       	Initialised AES-256 SDCTR server->client encryption
Trace:       	Initialised HMAC-SHA-256 server->client MAC algorithm
Trace:       	Pageant is running. Requesting keys.
Trace:       	Pageant has 0 SSH-2 keys
Trace:       	Attempting keyboard-interactive authentication
Trace:       	Using keyboard-interactive authentication. inst_len: 0, num_prompts: 1
Command:	Pass: *************
Trace:       	Access granted
Trace:       	Opening session as main channel
Trace:       	Opened main channel
Trace:       	Started a shell/command
Status:      	Connected to 192.168.124.38
Trace:       	CSftpDeleteOpData::ParseResponse() in state 3
Trace:       	CControlSocket::ResetOperation(0)
Trace:       	CSftpDeleteOpData::Reset(0) in state 3
Trace:       	CFileZillaEnginePrivate::ResetOperation(0)
Status:      	Retrieving directory listing of "/home/jeroenp/Versioned/capture-192.168.124.38/fritzcap/captures"...
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpListOpData::Send() in state 0
Trace:       	CSftpChangeDirOpData::Send() in state 0
Trace:       	CSftpChangeDirOpData::Send() in state 2
Command:	cd "/home/jeroenp/Versioned/capture-192.168.124.38/fritzcap/captures"
Response: 	New directory is: "/home/jeroenp/Versioned/capture-192.168.124.38/fritzcap/captures"
Trace:       	CSftpChangeDirOpData::ParseResponse() in state 2
Trace:       	CControlSocket::ResetOperation(0)
Trace:       	CSftpChangeDirOpData::Reset(0) in state 2
Trace:       	CSftpListOpData::SubcommandResult(0) in state 1
Trace:       	CControlSocket::SendNextCommand()
Trace:       	CSftpListOpData::Send() in state 2
Trace:       	CSftpListOpData::Send() in state 3
Command:	ls
Status:      	Listing directory /home/jeroenp/Versioned/capture-192.168.124.38/fritzcap/captures
Listing:      	drwxr-xr-x    5 jeroenp  users        4096 Aug  4 09:56 ..
Listing:      	drwxr-xr-x    2 jeroenp  users        4096 Aug  4 09:27 .
Trace:       	CSftpListOpData::ParseResponse() in state 3
Trace:       	CControlSocket::ResetOperation(0)
Trace:       	CSftpListOpData::Reset(0) in state 3
Status:      	Directory listing of "/home/jeroenp/Versioned/capture-192.168.124.38/fritzcap/captures" successful
Trace:       	CFileZillaEnginePrivate::ResetOperation(0)

view raw
README.md
hosted with ❤ by GitHub

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

 
%d bloggers like this: