Running with --libssh-debug does not provide any further hint: x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 [2020/05/20 13:49:23.492000, 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 [2020/05/20 13:49:23.502982, 2] ssh_socket_connect: Nonblocking connection socket: 2192 [2020/05/20 13:49:23.503982, 2] ssh_connect: Socket connecting, now waiting for the callbacks to work [2020/05/20 13:49:23.508040, 1] socket_callback_connected: Socket connection callback: 1 (0) [2020/05/20 13:49:23.523984, 2] ssh_client_connection_callback: SSH server banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 13:49:23.523984, 2] ssh_analyze_banner: Analyzing banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 13:49:23.524982, 2] ssh_analyze_banner: We are talking to an OpenSSH client version: 5.8 (50800) [2020/05/20 13:49:24.665982, 1] ssh_known_hosts_read_entries: Failed to open the known_hosts file '/etc/ssh/ssh_known_hosts': No such file or directory [2020/05/20 13:49:24.666982, 2] ssh_kex_select_methods: Negotiated ecdh-sha2-nistp256,ecdsa-sha2-nistp256,aes256-ctr,aes256-ctr,hmac-sha1,hmac-sha1,none,none,, [2020/05/20 13:49:24.684982, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 13:49:24.686022, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 13:49:24.687983, 2] ssh_packet_client_ecdh_reply: SSH_MSG_NEWKEYS sent [2020/05/20 13:49:24.687983, 2] ssh_packet_newkeys: Received SSH_MSG_NEWKEYS -> then it crashes

On Wed, May 20, 2020 at 12:36 PM Ulrich Sibiller <ulrich.sibiller@gmail.com> wrote:

Here's the output of the centos7 nightly build x2goclient-4.1.2.3-0.0x2go1.0.git20200520.1947.heuler.el7.x86_64 which is working with the same session setup:

x2go-DEBUG-../src/sshmasterconnection.cpp:795> Session port before config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:869> Session port before config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:879> Session port after config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:903> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:942> state: 1 ---> Windows version stopped here x2go-DEBUG-../src/sshmasterconnection.cpp:1206> Challenge authentication requested.

x2go-DEBUG-../src/sshmasterconnection.cpp:1084> Have prompts: 1

x2go-DEBUG-../src/sshmasterconnection.cpp:1088> Prompt[0]: |Password: |

x2go-DEBUG-../src/sshmasterconnection.cpp:1092> Password request

x2go-DEBUG-../src/sshmasterconnection.cpp:1084> Have prompts: 0

x2go-DEBUG-../src/sshmasterconnection.cpp:1170> Challenge authentication OK.

On Wed, May 20, 2020 at 12:12 PM Ulrich Sibiller <ulrich.sibiller@gmail.com> wrote:

...

Hi,

both x2goclient for windows 4.1.2.2-20200213 and https://code.x2go.org/releases/binary-win32/x2goclient/heuler/mingw32-4.8/qt... are crashing during connection establishment when using a proxy (output from the debug build):

x2go-DEBUG-../src/onmainwindow.cpp:2931> Starting new ssh connection to server:"!myremotehost":"22" krbLogin: false x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "!myremotehost"; port 22; user "yyy"; useproxy true; proxyserver "!10.11.12.13"; proxyport 22 x2go-DEBUG-../src/sshmasterconnection.cpp:495> proxyserver: "!10.11.12.13"; proxyport: 22; proxylogin: "remoteuser" x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "!10.11.12.13"; port 22; user "remoteuser"; useproxy false; proxyserver ""; proxyport 0 x2go-DEBUG-../src/sshmasterconnection.cpp:248> Starting SSH connection without Kerberos authentication. x2go-DEBUG-../src/sshmasterconnection.cpp:250> SshMasterConnection, instance SshMasterConnection(0x3917608) created. x2go-DEBUG-../src/sshmasterconnection.cpp:492> SshMasterConnection, instance SshMasterConnection(0x3917608) entering thread. x2go-DEBUG-../src/sshmasterconnection.cpp:573> Setting SSH directory to C:/Users/LOCALUSER/ssh x2go-DEBUG-../src/sshmasterconnection.cpp:795> Session port before config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:869> Session port before config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:879> Session port after config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:903> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:942> state: 1 x2go-DEBUG-../src/sshmasterconnection.cpp:674> Setting SSH directory to C:/Users/LOCALUSER/ssh

and then x2go completely vanishes.

Any ideas how to debug this further?

Uli

Hi Uli,

Try to debug the code using the debugger? Adding print lines is not the way to do it.

I hope somebody can say how to re-compile the code with debug symbols and if gdb is good enough?

Kind regards, Melroy van den Berg

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ Op woensdag, mei 20, 2020 2:16 PM, Ulrich Sibiller <ulrich.sibiller@gmail.com> schreef:

Running with --libssh-packetlog shows a bit more: [2020/05/20 14:08:36.287745, 2] ssh_socket_connect: Nonblocking connection socket: 2228 [2020/05/20 14:08:36.287745, 2] ssh_connect: Socket connecting, now waiting for the callbacks to work [2020/05/20 14:08:36.288743, 3] ssh_connect: Actual timeout : 60000 [2020/05/20 14:08:36.293743, 3] ssh_socket_pollcallback: Received POLLOUT in connecting state [2020/05/20 14:08:36.293743, 1] socket_callback_connected: Socket connection callback: 1 (0) [2020/05/20 14:08:36.295746, 3] ssh_socket_unbuffered_write: Enabling POLLOUT for socket [2020/05/20 14:08:36.309751, 3] callback_receive_banner: Received banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 14:08:36.312765, 2] ssh_client_connection_callback: SSH server banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 14:08:36.313757, 2] ssh_analyze_banner: Analyzing banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 14:08:36.314750, 2] ssh_analyze_banner: We are talking to an OpenSSH client version: 5.8 (50800) [2020/05/20 14:08:37.352741, 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" [2020/05/20 14:08:37.353749, 1] ssh_known_hosts_read_entries: Failed to open the known_hosts file '/etc/ssh/ssh_known_hosts': No such file or directory [2020/05/20 14:08:37.354752, 3] ssh_client_select_hostkeys: Algorithms found in known_hosts files: "ecdsa-sha2-nistp256" [2020/05/20 14:08:37.355743, 3] ssh_client_select_hostkeys: Changing host key method to "ecdsa-sha2-nistp256,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss" [2020/05/20 14:08:37.355743, 3] ssh_socket_unbuffered_write: Enabling POLLOUT for socket [2020/05/20 14:08:37.356742, 3] packet_send2: packet: wrote [type=20, len=940, padding_size=4, comp=935, payload=935] [2020/05/20 14:08:37.356742, 3] ssh_send_kex: SSH_MSG_KEXINIT sent [2020/05/20 14:08:37.357742, 3] ssh_packet_socket_callback: packet: read type 20 [len=852,padding=5,comp=846,payload=846] [2020/05/20 14:08:37.357742, 3] ssh_packet_process: Dispatching handler for packet type 20 [2020/05/20 14:08:37.357742, 2] ssh_kex_select_methods: Negotiated ecdh-sha2-nistp256,ecdsa-sha2-nistp256,aes256-ctr,aes256-ctr,hmac-sha1,hmac-sha1,none,none,, [2020/05/20 14:08:37.359741, 3] packet_send2: packet: wrote [type=30, len=76, padding_size=5, comp=70, payload=70] [2020/05/20 14:08:37.360741, 3] ssh_socket_unbuffered_write: Enabling POLLOUT for socket [2020/05/20 14:08:37.371817, 3] ssh_packet_socket_callback: packet: read type 31 [len=292,padding=8,comp=283,payload=283] [2020/05/20 14:08:37.371817, 3] ssh_packet_process: Dispatching handler for packet type 31 [2020/05/20 14:08:37.374742, 3] ssh_socket_unbuffered_write: Enabling POLLOUT for socket [2020/05/20 14:08:37.374742, 3] packet_send2: packet: wrote [type=21, len=12, padding_size=10, comp=1, payload=1] [2020/05/20 14:08:37.376744, 3] crypt_set_algorithms2: Set output algorithm to aes256-ctr [2020/05/20 14:08:37.376744, 3] crypt_set_algorithms2: Set HMAC output algorithm to hmac-sha1 [2020/05/20 14:08:37.377744, 3] crypt_set_algorithms2: Set input algorithm to aes256-ctr [2020/05/20 14:08:37.377744, 3] crypt_set_algorithms2: Set HMAC input algorithm to hmac-sha1 [2020/05/20 14:08:37.378742, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 14:08:37.378742, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 14:08:37.378742, 2] ssh_packet_client_ecdh_reply: SSH_MSG_NEWKEYS sent [2020/05/20 14:08:37.379742, 3] ssh_packet_socket_callback: Processing 16 bytes left in socket buffer [2020/05/20 14:08:37.379742, 3] ssh_packet_socket_callback: packet: read type 21 [len=12,padding=10,comp=1,payload=1] [2020/05/20 14:08:37.379742, 3] ssh_packet_process: Dispatching handler for packet type 21 [2020/05/20 14:08:37.380742, 2] ssh_packet_newkeys: Received SSH_MSG_NEWKEYS [2020/05/20 14:08:37.382742, 2] ssh_packet_newkeys: Signature verified and valid [2020/05/20 14:08:37.382742, 3] ssh_connect: current state : 7 x2go-DEBUG-../src/sshmasterconnection.cpp:869> Session port before config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:879> Session port after config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:903> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:942> state: 1

x2go-DEBUG-../src/sshmasterconnection.cpp:674> Setting SSH directory to C:/Users/XXX/ssh

On Wed, May 20, 2020 at 1:52 PM Ulrich Sibiller ulrich.sibiller@gmail.com wrote:

...

Running with --libssh-debug does not provide any further hint: x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 [2020/05/20 13:49:23.492000, 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 [2020/05/20 13:49:23.502982, 2] ssh_socket_connect: Nonblocking connection socket: 2192 [2020/05/20 13:49:23.503982, 2] ssh_connect: Socket connecting, now waiting for the callbacks to work [2020/05/20 13:49:23.508040, 1] socket_callback_connected: Socket connection callback: 1 (0) [2020/05/20 13:49:23.523984, 2] ssh_client_connection_callback: SSH server banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 13:49:23.523984, 2] ssh_analyze_banner: Analyzing banner: SSH-2.0-OpenSSH_5.8 [2020/05/20 13:49:23.524982, 2] ssh_analyze_banner: We are talking to an OpenSSH client version: 5.8 (50800) [2020/05/20 13:49:24.665982, 1] ssh_known_hosts_read_entries: Failed to open the known_hosts file '/etc/ssh/ssh_known_hosts': No such file or directory [2020/05/20 13:49:24.666982, 2] ssh_kex_select_methods: Negotiated ecdh-sha2-nistp256,ecdsa-sha2-nistp256,aes256-ctr,aes256-ctr,hmac-sha1,hmac-sha1,none,none,, [2020/05/20 13:49:24.684982, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 13:49:24.686022, 2] ssh_init_rekey_state: Set rekey after 4294967296 blocks [2020/05/20 13:49:24.687983, 2] ssh_packet_client_ecdh_reply: SSH_MSG_NEWKEYS sent [2020/05/20 13:49:24.687983, 2] ssh_packet_newkeys: Received SSH_MSG_NEWKEYS -> then it crashes On Wed, May 20, 2020 at 12:36 PM Ulrich Sibiller ulrich.sibiller@gmail.com wrote:

...

Here's the output of the centos7 nightly build x2goclient-4.1.2.3-0.0x2go1.0.git20200520.1947.heuler.el7.x86_64 which is working with the same session setup: x2go-DEBUG-../src/sshmasterconnection.cpp:795> Session port before config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:869> Session port before config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:879> Session port after config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:903> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:942> state: 1 ---> Windows version stopped here x2go-DEBUG-../src/sshmasterconnection.cpp:1206> Challenge authentication requested. x2go-DEBUG-../src/sshmasterconnection.cpp:1084> Have prompts: 1 x2go-DEBUG-../src/sshmasterconnection.cpp:1088> Prompt[0]: |Password: | x2go-DEBUG-../src/sshmasterconnection.cpp:1092> Password request x2go-DEBUG-../src/sshmasterconnection.cpp:1084> Have prompts: 0 x2go-DEBUG-../src/sshmasterconnection.cpp:1170> Challenge authentication OK. On Wed, May 20, 2020 at 12:12 PM Ulrich Sibiller ulrich.sibiller@gmail.com wrote:

...

Hi, both x2goclient for windows 4.1.2.2-20200213 and https://code.x2go.org/releases/binary-win32/x2goclient/heuler/mingw32-4.8/qt... are crashing during connection establishment when using a proxy (output from the debug build): x2go-DEBUG-../src/onmainwindow.cpp:2931> Starting new ssh connection to server:"!myremotehost":"22" krbLogin: false x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "!myremotehost"; port 22; user "yyy"; useproxy true; proxyserver "!10.11.12.13"; proxyport 22 x2go-DEBUG-../src/sshmasterconnection.cpp:495> proxyserver: "!10.11.12.13"; proxyport: 22; proxylogin: "remoteuser" x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "!10.11.12.13"; port 22; user "remoteuser"; useproxy false; proxyserver ""; proxyport 0 x2go-DEBUG-../src/sshmasterconnection.cpp:248> Starting SSH connection without Kerberos authentication. x2go-DEBUG-../src/sshmasterconnection.cpp:250> SshMasterConnection, instance SshMasterConnection(0x3917608) created. x2go-DEBUG-../src/sshmasterconnection.cpp:492> SshMasterConnection, instance SshMasterConnection(0x3917608) entering thread. x2go-DEBUG-../src/sshmasterconnection.cpp:573> Setting SSH directory to C:/Users/LOCALUSER/ssh x2go-DEBUG-../src/sshmasterconnection.cpp:795> Session port before config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:805> Session port after config file parse: 22 x2go-DEBUG-../src/sshmasterconnection.cpp:869> Session port before config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:879> Session port after config file parse (part 2): 22 x2go-DEBUG-../src/sshmasterconnection.cpp:903> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:942> state: 1 x2go-DEBUG-../src/sshmasterconnection.cpp:674> Setting SSH directory to C:/Users/LOCALUSER/ssh and then x2go completely vanishes. Any ideas how to debug this further? Uli

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