I also have some additional information from the environment. ldd nxagent -ac :1 nxagent: linux-vdso.so.1 => (0x00007fffa63ff000) libX11.so.6 => /usr/lib64/libX11.so.6 (0x0000003eb5400000) libXcomp.so.3 => /usr/lib64/libXcomp.so.3 (0x00000030d8200000) libXcompshad.so.3 => /usr/lib64/libXcompshad.so.3 (0x00000030d7600000) libXrender.so.1 => /usr/lib64/libXrender.so.1 (0x0000003eb7400000) libXfixes.so.3 => /usr/lib64/libXfixes.so.3 (0x0000003eb8000000) libXfont.so.1 => /usr/lib64/libXfont.so.1 (0x00000030d6600000) libXcomposite.so.1 => /usr/lib64/libXcomposite.so.1 (0x0000003ebb800000) libXinerama.so.1 => /usr/lib64/libXinerama.so.1 (0x0000003eb8800000) libXdmcp.so.6 => /usr/lib64/libXdmcp.so.6 (0x0000003ebcc00000) libNX_X11.so.6 => /usr/lib64/nx/libNX_X11.so.6 (0x00000030d6e00000) libXext.so.6 => /usr/lib64/libXext.so.6 (0x0000003eb6400000) libz.so.1 => /lib64/libz.so.1 (0x0000003eb3800000) libm.so.6 => /lib64/libm.so.6 (0x0000003eb2c00000) libXpm.so.4 => /usr/lib64/libXpm.so.4 (0x0000003ec0000000) libxml2.so.2 => /usr/lib64/libxml2.so.2 (0x00000030d7200000) libpixman-1.so.0 => /usr/lib64/libpixman-1.so.0 (0x0000003ebb000000) libpng12.so.0 => /usr/lib64/libpng12.so.0 (0x0000003eb6800000) libjpeg.so.62 => /usr/lib64/libjpeg.so.62 (0x0000003ec1400000) libc.so.6 => /lib64/libc.so.6 (0x0000003eb2400000) libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x0000003eb5000000) libdl.so.2 => /lib64/libdl.so.2 (0x0000003eb3000000) libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003ebd400000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003ebc800000) libNX_Xext.so.6 => /usr/lib64/nx/libNX_Xext.so.6 (0x00000030d8a00000) libNX_Xtst.so.6 => /usr/lib64/nx/libNX_Xtst.so.6 (0x00000030d8600000) libNX_Xrandr.so.2 => /usr/lib64/nx/libNX_Xrandr.so.2 (0x00000030d8e00000) libNX_Xdamage.so.1 => /usr/lib64/nx/libNX_Xdamage.so.1 (0x00000030d7a00000) libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x0000003eb7000000) libfontenc.so.1 => /usr/lib64/libfontenc.so.1 (0x00000030d7e00000) libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003eb2800000) /lib64/ld-linux-x86-64.so.2 (0x0000003eb2000000) libXau.so.6 => /usr/lib64/libXau.so.6 (0x0000003eb5c00000) libNX_Xrender.so.1 => /usr/lib64/nx/libNX_Xrender.so.1 (0x00000030d6a00000) readelf -d nxagent Dynamic section at offset 0x409d10 contains 40 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libX11.so.6] 0x0000000000000001 (NEEDED) Shared library: [libXcomp.so.3] 0x0000000000000001 (NEEDED) Shared library: [libXcompshad.so.3] 0x0000000000000001 (NEEDED) Shared library: [libXrender.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXfixes.so.3] 0x0000000000000001 (NEEDED) Shared library: [libXfont.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXcomposite.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXinerama.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXdmcp.so.6] 0x0000000000000001 (NEEDED) Shared library: [libNX_X11.so.6] 0x0000000000000001 (NEEDED) Shared library: [libXext.so.6] 0x0000000000000001 (NEEDED) Shared library: [libz.so.1] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libXpm.so.4] 0x0000000000000001 (NEEDED) Shared library: [libxml2.so.2] 0x0000000000000001 (NEEDED) Shared library: [libpixman-1.so.0] 0x0000000000000001 (NEEDED) Shared library: [libpng12.so.0] 0x0000000000000001 (NEEDED) Shared library: [libjpeg.so.62] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x000000000000000f (RPATH) Library rpath: [/usr/lib64/nx/X11] 0x000000000000001d (RUNPATH) Library runpath: [/usr/lib64/nx/X11] 0x000000000000000c (INIT) 0x409298 0x000000000000000d (FINI) 0x727088 0x000000006ffffef5 (GNU_HASH) 0x400298 0x0000000000000005 (STRTAB) 0x403970 0x0000000000000006 (SYMTAB) 0x400400 0x000000000000000a (STRSZ) 8398 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000015 (DEBUG) 0x0 0x0000000000000003 (PLTGOT) 0xa09fe8 0x0000000000000002 (PLTRELSZ) 12720 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x4060e8 0x0000000000000007 (RELA) 0x405f98 0x0000000000000008 (RELASZ) 336 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000006ffffffe (VERNEED) 0x405eb8 0x000000006fffffff (VERNEEDNUM) 5 0x000000006ffffff0 (VERSYM) 0x405a3e 0x0000000000000000 (NULL) 0x0 gdb nxagent GNU gdb (GDB) Red Hat Enterprise Linux (7.2-56.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/bin/nxagent...(no debugging symbols found)...done. Missing separate debuginfos, use: debuginfo-install nxagent-3.5.99.20-0.0build1.1.git20190425.3309.main.el6.x86_64 (gdb) r -ac :1 Starting program: /usr/bin/nxagent -ac :1 [Thread debugging using libthread_db enabled] NXAGENT - Version 3.5.99.20 Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) Copyright (c) 2008-2014 Oleksandr Shneyder Copyright (c) 2011-2016 Mike Gabriel Copyright (c) 2014-2016 Ulrich Sibiller Copyright (c) 2014-2016 Mihai Moldovan Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) See https://github.com/ArcticaProject/nx-libs for more information. Info: Agent running with pid '31252'. Session: Starting session at 'Fri Sep 20 15:39:37 2019'. Info: Using alpha channel in render extension. nxagent: xcb_io.c:520: _XAllocID: Assertion `ret != inval_id' failed. Program received signal SIGABRT, Aborted. 0x0000003eb24324f5 in raise () from /lib64/libc.so.6 ________________________________ De: Elder Vicente Enviado: sexta-feira, 20 de setembro de 2019 14:54 Para: submit@bugs.x2go.org Assunto: x2gostartagent: X2Go Agent terminated unexpectedly Package: x2goserver Version: 4.1.0.3-0.0 Hello, I have a server (Centos 6) with Gnome, SSH and X2goServer. The accesses by SSH is ok, but X2goClient (4.1.2.0 - Windows) do not work. On server-side, I have this message: "/usr/bin/x2gostartagent: Failed to start X2Go Agent session with ID elder2-50-1568998198_stDGNOME_dp32. X2Go Agent terminated unexpectedly. Aborting session startup." Can you help me? [cid:ba6292cf-4d5b-47c4-a8c3-8594e1140b77] Packages installed: x2goserver-x2goagent-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 perl-X2Go-Server-DB-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 x2goserver-extensions-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 perl-X2Go-Log-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 x2goserver-common-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 x2goserver-xsession-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 perl-X2Go-Server-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 x2goserver-4.1.0.3-0.0x2go1.1.git20181129.1708.main.el6.x86_64 Log on /var/log/messages: Sep 20 13:49:57 saserver /usr/bin/x2gostartagent: x2gostartagent called with options: 800x600 adsl 16m-jpeg-9 unix-kde-depth_32 us auto 1 D GNOME both Sep 20 13:49:58 saserver /usr/bin/x2gosessionlimit[7133]: x2gosessionlimit has been called Sep 20 13:49:58 saserver x2golistsessions: x2golistsessions has been called with options: --all-servers Sep 20 13:50:00 saserver /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Sep 20 13:50:00 saserver /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS Sep 20 13:50:00 saserver /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: elder2-50-1568998198_stDGNOME_dp32 pre-start Sep 20 13:50:00 saserver /usr/bin/x2gostartagent: creating new session: elder2-50-1568998198_stDGNOME_dp32 59781d72342a249f29eaa296a45a2326 7256 200.131.62.254 45498 45499 45500 -1 -1 Sep 20 13:50:01 saserver /usr/bin/x2gostartagent: Failed to start X2Go Agent session with ID elder2-50-1568998198_stDGNOME_dp32. X2Go Agent terminated unexpectedly. Aborting session startup. Sep 20 13:50:01 saserver /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Sep 20 13:50:01 saserver /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS Sep 20 13:50:01 saserver /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: elder2-50-1568998198_stDGNOME_dp32 fail-start