By chance, I learned of the --libssh-debug and --libssh-packetlog options.
So here's the output of a session that crashes. Any hints as how to pursue this
further?
C:\Program Files (x86)\x2goclient>x2goclient.debug.exe --debug --libssh-debug
--libssh-packetlog
x2go-INFO-1> "Starting X2Go Client 4.1.2.2..."
x2go-INFO-4> "Translator: :/i18n/x2goclient_de_de found."
x2go-INFO-4> "Übersetzung: :/i18n/qt_de_de gefunden."
x2go-DEBUG-../src/onmainwindow.cpp:10779> Getting X.Org Server settings.
x2go-INFO-3> "X2GoClient wurde gestartet."
x2go-DEBUG-../src/onmainwindow.cpp:575> "$HOME=C:/Users/ef"
x2go-DEBUG-../src/onmainwindow.cpp:2266> Reading 1 sessions from config file.
x2go-DEBUG-../src/sessionbutton.cpp:361> Creating QPixmap with session icon:
":/img/icons/128x128/x2gosession.png".
x2go-DEBUG-../src/onmainwindow.cpp:13290> libssh not initialized yet.
Initializing.
x2go-DEBUG-../src/pulsemanager.cpp:369> pulseaudio --version
returned:"pulseaudio 13.0
"
x2go-DEBUG-../src/onmainwindow.cpp:10682> Starting helper servers for Windows
...
x2go-DEBUG-../src/onmainwindow.cpp:10849> "/cygdrive/C/Users/ef/.x2go/var"
cygwin var path
x2go-DEBUG-../src/onmainwindow.cpp:10937> "C:/Users/ef/.x2go/etc/sshd_config
created."
x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
x2go-DEBUG-../src/onmainwindow.cpp:10366> Port is free: 7022
x2go-DEBUG-../src/onmainwindow.cpp:11288> Logging cygwin sshd to:
"C:/Users/ef/.x2go/sshLogs/Hp2320.log"
x2go-DEBUG-../src/onmainwindow.cpp:11302> Creating desktop: x2go_ef
x2go-DEBUG-../src/pulsemanager.cpp:227> pulse started with arguments
("--exit-idle-time=-1", "-n", "-F", "C:\Users\ef\.x2go\pulse\config.pa", "-p",
"C:\Program Files (x86)\x2goclient\pulse\lib\pulse-13.0\modules",
"--log-level=debug", "--verbose",
"--log-target=file:C:\Users\ef\.x2go\pulse\pulse.log") - waiting for it to
finx2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
ish...
x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 7022
x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 7022
x2go-DEBUG-../src/onmainwindow.cpp:11399> User mode OpenSSH server started
successfully.
x2go-DEBUG-../src/onmainwindow.cpp:2752> Creating QPixmap with session icon:
'":/img/icons/128x128/x2gosession.png"'.
x2go-INFO-8> "Verbindung mit Server wird gestartet: aegidienberg:22"
x2go-DEBUG-../src/onmainwindow.cpp:2853> Starting new ssh connection to
server:"aegidienberg":"22" krbLogin: false
x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host
"aegidienberg"; port 22; user "mtuser"; useproxy true; proxyserver
"login.math.uni-bonn.de"; proxyport 22
x2go-DEBUG-../src/sshmasterconnection.cpp:248> Starting SSH connection without
Kerberos authentication.
x2go-DEBUG-../src/sshmasterconnection.cpp:250> SshMasterConnection, instance
SshMasterConnection(0x3a10da8) created.
x2go-DEBUG-../src/sshmasterconnection.cpp:495> SshMasterConnection, instance
SshMasterConnection(0x3a10da8) entering thread.
x2go-DEBUG-../src/sshmasterconnection.cpp:498> proxyserver:
"login.math.uni-bonn.de"; proxyport: 22; proxylogin: ""
x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host
"login.math.uni-bonn.de"; port 22; user ""; useproxy false; proxyserver "";
proxyport 0
x2go-DEBUG-../src/sshmasterconnection.cpp:224> Temporary session user name
after config file parse:
x2go-DEBUG-../src/sshmasterconnection.cpp:248> Starting SSH connection without
Kerberos authentication.
x2go-DEBUG-../src/sshmasterconnection.cpp:250> SshMasterConnection, instance
SshMasterConnection(0x3a112e8) created.
x2go-DEBUG-../src/sshmasterconnection.cpp:495> SshMasterConnection, instance
SshMasterConnection(0x3a112e8) entering thread.
x2go-DEBUG-../src/sshmasterconnection.cpp:575> Setting SSH directory to
C:/Users/ef/ssh
x2go-DEBUG-../src/sshmasterconnection.cpp:797> Session port before config file
parse: 22
x2go-DEBUG-../src/sshmasterconnection.cpp:807> Session port after config file
parse: 22
[2020/05/25 18:47:02.347704, 2] ssh_connect: libssh 0.9.3 (c) 2003-2019 Aris
Adamantiadis, Andreas Schneider and libssh contributors. Distributed under the
LGPL, please refer to COPYING file for information about your rights, using
threading threads_pthread
[2020/05/25 18:47:02.401163, 2] ssh_socket_connect: Nonblocking connection
socket: 2228
[2020/05/25 18:47:02.401163, 2] ssh_connect: Socket connecting, now waiting
for the callbacks to work
[2020/05/25 18:47:02.401163, 3] ssh_connect: Actual timeout : 60000
[2020/05/25 18:47:02.438119, 3] ssh_socket_pollcallback: Received POLLOUT in
connecting state
[2020/05/25 18:47:02.438119, 1] socket_callback_connected: Socket connection
callback: 1 (0)
[2020/05/25 18:47:02.438119, 3] ssh_socket_unbuffered_write: Enabling POLLOUT
for socket
[2020/05/25 18:47:02.491386, 3] callback_receive_banner: Received banner:
SSH-2.0-OpenSSH_5.9 NetBSD_Secure_Shell-20110907-hpn13v11-lpk
[2020/05/25 18:47:02.491386, 2] ssh_client_connection_callback: SSH server
banner: SSH-2.0-OpenSSH_5.9 NetBSD_Secure_Shell-20110907-hpn13v11-lpk
[2020/05/25 18:47:02.491386, 2] ssh_analyze_banner: Analyzing banner:
SSH-2.0-OpenSSH_5.9 NetBSD_Secure_Shell-20110907-hpn13v11-lpk
[2020/05/25 18:47:02.491386, 2] ssh_analyze_banner: We are talking to an
OpenSSH client version: 5.9 (50900)
[2020/05/25 18:47:03.714230, 3] ssh_client_select_hostkeys: Order of wanted
host keys:
"ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss"
[2020/05/25 18:47:03.803831, 1] ssh_known_hosts_read_entries: Failed to open
the known_hosts file '/etc/ssh/ssh_known_hosts': No such file or directory
[2020/05/25 18:47:03.803831, 3] ssh_client_select_hostkeys: Algorithms found
in known_hosts files: "ecdsa-sha2-nistp521"
[2020/05/25 18:47:03.803831, 3] ssh_client_select_hostkeys: Changing host key
method to
"ecdsa-sha2-nistp521,ssh-ed25519,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss"
[2020/05/25 18:47:03.803831, 3] ssh_socket_unbuffered_write: Enabling POLLOUT
for socket
[2020/05/25 18:47:03.803831, 3] packet_send2: packet: wrote [type=20, len=940,
padding_size=4, comp=935, payload=935]
[2020/05/25 18:47:03.803831, 3] ssh_send_kex: SSH_MSG_KEXINIT sent
[2020/05/25 18:47:03.803831, 3] ssh_packet_socket_callback: packet: read type
20 [len=812,padding=5,comp=806,payload=806]
[2020/05/25 18:47:03.803831, 3] ssh_packet_process: Dispatching handler for
packet type 20
[2020/05/25 18:47:03.822580, 2] ssh_kex_select_methods: Negotiated
ecdh-sha2-nistp256,ecdsa-sha2-nistp521,aes256-ctr,aes256-ctr,hmac-sha1,hmac-sha1,none,none,,
[2020/05/25 18:47:03.822580, 3] packet_send2: packet: wrote [type=30, len=76,
padding_size=5, comp=70, payload=70]
[2020/05/25 18:47:03.822580, 3] ssh_socket_unbuffered_write: Enabling POLLOUT
for socket
[2020/05/25 18:47:03.875547, 3] ssh_packet_socket_callback: packet: read type
31 [len=428,padding=11,comp=416,payload=416]
[2020/05/25 18:47:03.875547, 3] ssh_packet_process: Dispatching handler for
packet type 31
[2020/05/25 18:47:03.875547, 3] ssh_socket_unbuffered_write: Enabling POLLOUT
for socket
[2020/05/25 18:47:03.875547, 3] packet_send2: packet: wrote [type=21, len=12,
padding_size=10, comp=1, payload=1]
[2020/05/25 18:47:03.875547, 3] crypt_set_algorithms2: Set output algorithm to
aes256-ctr
[2020/05/25 18:47:03.875547, 3] crypt_set_algorithms2: Set HMAC output
algorithm to hmac-sha1
[2020/05/25 18:47:03.875547, 3] crypt_set_algorithms2: Set input algorithm to
aes256-ctr
[2020/05/25 18:47:03.875547, 3] crypt_set_algorithms2: Set HMAC input
algorithm to hmac-sha1
[2020/05/25 18:47:03.875547, 2] ssh_init_rekey_state: Set rekey after
4294967296 blocks
[2020/05/25 18:47:03.875547, 2] ssh_init_rekey_state: Set rekey after
4294967296 blocks
[2020/05/25 18:47:03.875547, 2] ssh_packet_client_ecdh_reply: SSH_MSG_NEWKEYS
sent
[2020/05/25 18:47:03.875547, 3] ssh_packet_socket_callback: Processing 16
bytes left in socket buffer
[2020/05/25 18:47:03.875547, 3] ssh_packet_socket_callback: packet: read type
21 [len=12,padding=10,comp=1,payload=1]
[2020/05/25 18:47:03.875547, 3] ssh_packet_process: Dispatching handler for
packet type 21
[2020/05/25 18:47:03.875547, 2] ssh_packet_newkeys: Received SSH_MSG_NEWKEY
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