Well, here's the code producing that output:
typeset -i retry='0' typeset -i max_retry='10' typeset output='' for ((retry = 0; retry < max_retry; ++retry)); do typeset -i free_port="${X2GO_PORT}" if free_port="$("${X2GO_LIB_PATH}/x2gogetfreeport" "${current_host_name}" "${ss}" 'display' "${X2GO_PORT}")"; then X2GO_PORT="${free_port}"
if [[ -n "${SHADREQ_USER}" ]]; thenSESSION_NAME="${SHADREQ_USER}-${X2GO_PORT}-$(date '+%s')" else SESSION_NAME="${USER}-${X2GO_PORT}-$(date '+%s')" fi if [[ -n "${COLORDEPTH}" ]]; then
SESSION_NAME="${SESSION_NAME}_st${SESSION_TYPE}${X2GO_CMD}_dp${COLORDEPTH}" SESSION_NAME="${SESSION_NAME//:/PP}" fi
# sanitize session name
SESSION_NAME="$(perl -pe 's/[^a-zA-Z0-9\.\_\-\@]//g'<<< "${SESSION_NAME}")"
if [[ -n "${SHADREQ_USER}" ]]; then
"${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'debug'"initializing new shadow session with ID ${SESSION_NAME}"
output="$("${X2GO_LIB_PATH}/x2goinsertshadowsession" "${X2GO_PORT}" "${current_host_name}" "${SESSION_NAME}" "${SHADREQ_USER}")" else "${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'debug' "initializing new session with ID ${SESSION_NAME}" output="$("${X2GO_LIB_PATH}/x2goinsertsession" "${X2GO_PORT}" "${current_host_name}" "${SESSION_NAME}")" fi
if [[ "${output}" = 'inserted' ]]; then
break
else
"${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'warning'"unable to insert display port into database. Retrying (run $((retry + 1)))." fi else "${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'warning' "no free display number available, cannot start new session. Retrying (run $((retry + 1)))." fi done
if [[ "${output}" != 'inserted' ]]; then typeset msg="Unable to find free display port or insert new session into database; parameters: port (${X2GO_PORT}), hostname (${current_host_name}) and session name (${SESSION_NAME})." "${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'err' "${msg}"
# Make x2goclient fail.
echo "${msg}" >&2
exit '10'fi
This boils down to
for ((retry = 0; retry < max_retry; ++retry)); do typeset -i free_port="${X2GO_PORT}" if free_port="$("${X2GO_LIB_PATH}/x2gogetfreeport" "${current_host_name}" "${ss}" 'display' "${X2GO_PORT}")"; then ... else "${X2GO_LIB_PATH}/x2gosyslog" "${0}" 'warning' "no free display number available, cannot start new session. Retrying (run $((retry + 1)))." fi done
-> as you can see x2gofreeport does not seem to report the port as free. You can try this manually:
/usr/lib/x2go/x2gogetfreeport $(hostname) "$(which ss)" display 50
If that will output a free port x2go should generally work. If not, you still have something running and blocking these ports. You can check with lsof -i :6050 and you will see who is blocking the first checked port.
You can also run the x2gogefreeport with bash -x: bash -x /usr/lib/x2go/x2gogetfreeport $(hostname) "$(which ss)" display 50
and see what going on.
Hope that helps,
Uli
On Mon, Jan 25, 2021 at 8:50 PM Robert Kudyba <rkudyba@fordham.edu> wrote:
I posted a similar issue back in Nov, 2020 at https://www.mail-archive.com/x2go-dev@lists.x2go.org/msg06284.html
rpm -qa|grep -i x2go x2goclient-4.1.2.2-3.fc33.x86_64 x2goserver-common-4.1.0.3-9.fc33.noarch perl-X2Go-Server-4.1.0.3-9.fc33.noarch perl-X2Go-Log-4.1.0.3-9.fc33.noarch perl-X2Go-Server-DB-4.1.0.3-9.fc33.x86_64 x2goagent-4.1.0.3-9.fc33.x86_64 x2goserver-xsession-4.1.0.3-9.fc33.noarch x2goserver-4.1.0.3-9.fc33.x86_64
nxagent -display :55 NXAGENT - Version 3.5.99.25
Jan 25 14:14:29 pascal /usr/bin/x2gostartagent[39654]: no free display number available, cannot start new session. Retrying (run 1). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39663]: no free display number available, cannot start new session. Retrying (run 2). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39672]: no free display number available, cannot start new session. Retrying (run 3). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39681]: no free display number available, cannot start new session. Retrying (run 4). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39690]: no free display number available, cannot start new session. Retrying (run 5). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39699]: no free display number available, cannot start new session. Retrying (run 6). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39708]: no free display number available, cannot start new session. Retrying (run 7). Jan 25 14:14:30 pascal /usr/bin/x2gostartagent[39717]: no free display number available, cannot start new session. Retrying (run 8). Jan 25 14:14:31 pascal /usr/bin/x2gostartagent[39726]: no free display number available, cannot start new session. Retrying (run 9). Jan 25 14:14:31 pascal /usr/bin/x2gostartagent[39736]: no free display number available, cannot start new session. Retrying (run 10). Jan 25 14:14:31 pascal /usr/bin/x2gostartagent[39737]: Unable to find free display port or insert new session into database; parameters: port (50), hostname (pascal.dsm.fordham.edu) and session name (). Jan 25 14:14:31 pascal kernel: kauditd_printk_skb: 21 callbacks suppressed
Let me to https://unix.stackexchange.com/questions/467507/x2go-unable-to-find-free-dis... so I ran x2godbadmin --createdb
Then I tried with another use and got: Connection failed. /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") Unable to find free display port or insert new session into database; parameters: port (50), hostname (oudomain.edu) and session name ().
How does one start X2Go Windows with debug enabled? I only found for Mac you can add the --debug flag.
My colleague also had this error:
XSession-x2go: X session started for moniot at Mon Jan 25 09:01:13 EST 2021 ** Message: 09:01:15.605: couldn't access control socket: /run/user/1200/keyring/control: No such file or directory SSH_AUTH_SOCK=/run/user/1200/keyring/ssh
** (mate-settings-daemon:1436112): WARNING **: 09:01:16.172: Could not open RFKILL control device, please verify your installation SSH_AUTH_SOCK=/run/user/1200/keyring/ssh SSH_AUTH_SOCK=/run/user/1200/keyring/ssh vmware-user: could not open /proc/fs/vmblock/dev Error: /usr/bin/vmtoolsd must be run inside a virtual machine on a VMware hypervisor product. SSH_AUTH_SOCK=/run/user/1200/keyring/ssh
(caja:1436133): Gtk-WARNING **: 09:01:17.552: Failed to register client: GDBus.Error:org.gnome.SessionManager.AlreadyRegistered: Unable to register client *** ERROR *** TI:09:01:17 TH:0x56299587f960 FI:gpm-manager.c FN:gpm_manager_systemd_inhibit,1786
- Error in dbus - GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Permission denied Traceback: mate-power-manager(+0x1d474) [0x562995487474] mate-power-manager(+0x136ab) [0x56299547d6ab] /lib64/libgobject-2.0.so.0(g_type_create_instance+0x248) [0x7f04c0b72498] /lib64/libgobject-2.0.so.0(+0x19205) [0x7f04c0b58205] /lib64/libgobject-2.0.so.0(g_object_new_with_properties+0x1dd) [0x7f04c0b596ad] /lib64/libgobject-2.0.so.0(g_object_new+0xc1) [0x7f04c0b5a331] mate-power-manager(+0x15f16) [0x56299547ff16] mate-power-manager(+0xb20a) [0x56299547520a] /lib64/libc.so.6(__libc_start_main+0xf2) [0x7f04c0708082] mate-power-manager(+0xb58e) [0x56299547558e] Failure: Module initialization failed SELinux Troubleshooter: Applet requires SELinux be enabled to run Initializing caja-open-terminal extension Initializing caja-xattr-tags extension Initializing caja-image-converter extension ICE default IO error handler doing an exit(), pid = 1436318, errno = 32
(mate-settings-daemon:1436112): GLib-GIO-WARNING **: 09:02:44.229: Error releasing name org.mate.SettingsDaemon.Rfkill: The connection is closed [1611583276,000,xklavier.c:xkl_engine_start_listen/] The backend does not require manual layout management - but it is provided by the application