With password authentication enabled and the user is locked by command ocpasswd, the login to that user will cause the ocserv server crash. syslog showed Aug 22 10:58:55 W500 kernel: [1944599.698112] ocserv-sm[8087]: segfault at 0 ip b731a3bb sp bfbfa36c error 4 in libc-2.24.so[b71e5000+1b1000] other infos # ocserv --version ocserv 0.11.6 Compiled with seccomp, tcp-wrappers, oath, radius, gssapi, PAM, PKCS#11, AnyConnect, GnuTLS version: 3.5.8 (compiled with 3.5.7) # uname -a Linux W500 3.18.46-rt50 #1 SMP PREEMPT RT Thu Feb 2 12:09:53 PST 2017 i686 GNU/Linux It's also on GitLab https://gitlab.com/ocserv/ocserv/issues/114