Hello All, hope everyone is doing great, I am unable to start syslog-ng, I see this messages... Any help is appreciated. Jul 25 11:36:14 server-1systemd[1]: Unit syslog.socket entered failed state. Jul 25 11:36:14 server-1systemd[1]: Unit syslog-ng.service entered failed state. Jul 25 11:36:14 server-1systemd[1]: syslog-ng.service failed. Jul 25 11:36:18 server-1kernel: dccp_diag: Unknown symbol dccp_hashinfo (err 0) Jul 25 11:36:18 server-1kernel: dccp_diag: Unknown symbol dccp_hashinfo (err 0) Jul 25 11:36:48 server-1systemd[1]: Listening on Syslog Socket. [root@server-1 tmp]# systemctl status syslog-ng.service ● syslog-ng.service - System Logger Daemon Loaded: loaded (/usr/lib/systemd/system/syslog-ng.service; enabled; vendor preset: enabled) Active: activating (start) since Tue 2017-07-25 11:44:20 GMT+7; 36s ago Docs: man:syslog-ng(8) Main PID: 21822 (syslog-ng) CGroup: /system.slice/syslog-ng.service └─21822 /usr/sbin/syslog-ng -F -p /var/run/syslogd.pid --fd-limit 50000 Jul 25 11:44:20 lvsinfosecsplunkcollector-1137760 systemd[1]: Starting System Logger Daemon... [root@server-1 tmp]# syslog-ng -V syslog-ng 3.9.1 Installer-Version: 3.9.1 Revision: Module-Directory: /usr/local/lib/syslog-ng Module-Path: /usr/local/lib/syslog-ng Available-Modules: date,json-plugin,syslogformat,add-contextual-data,affile,afprog,confgen,cryptofuncs,pseudofile,sdjournal,csvparser,graphite,cef,afmongodb,basicfuncs,system-source,afuser,dbparser,afstomp,afsocket,disk-buffer,kvformat,afamqp,linux-kmsg-format Enable-Debug: off Enable-GProf: off Enable-Memtrace: off Enable-IPv6: on Enable-Spoof-Source: off Enable-TCP-Wrapper: off Enable-Linux-Caps: off -- Thanks, Vijay Amrut.