<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"></style> </head> <body dir="ltr"> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr"> Hello everyone, I use tigervnc and lightdm on two CentOS 7.4 servers. The following packages are installed: kernel: kernel-3.10.0-693.17.1.el7.x86_64 <div>lightdm-1.18.3-5.el7.x86_64 lightdm-gobject-1.18.3-5.el7.x86_64 lightdm-gtk-1.8.5-19.el7.x86_64 lightdm-gtk-common-1.8.5-19.el7.noarch tigervnc-license-1.8.0-2.el7_4.noarch tigervnc-server-1.8.0-2.el7_4.x86_64 tigervnc-server-minimal-1.8.0-2.el7_4.x86_64 </div> One is workering for more than one year . The 2nd one also. but yesterday I have to reinstall it because one disk is failed and changed. After the installation, I believe I did the same configuation, but the 2nd one is not working. The VNC connection is just showing a black screen, then close. I see the following error logs: <div> lightdm[32702]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed lightdm[37158]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0) lightdm[32702]: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported </div> kernel: lightdm-gtk-gre[37161]: segfault at 0 ip 000055fa326fc710 sp 00007ffd011f8fc0 error 4 in lightdm-gtk-greeter[55fa326f2000+13000] The last line above, looks like something related with kernel? I really lost. Please let me know if you need more information for my problem. Thanks in advance! Xm </div> </body> </html>