This morning I got the sources via: $ git clone https://github.com/FreeRADIUS/freeradius-server.git $ cd freeradius-server $ git checkout -b v3.1.x origin/v3.1.x I built and configured the server, it starts fine. When receiving a request from a radtest client it crashes. "Datei oder Verzeichnis nicht gefunden" means "File not found". Here is what gdb outputs: (gdb) set args -X (gdb) run ... Ready to process requests ASSERT FAILED src/main/process.c[1843]: request->server_cs != NULL RAISING SIGNAL: Aborted Program received signal SIGABRT, Aborted. 0x00007ffff647d79b in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37 37 ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: Datei oder Verzeichnis nicht gefunden. (gdb) bt #0 0x00007ffff647d79b in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37 #1 0x00007ffff794c40e in fr_fault (sig=6) at src/lib/debug.c:650 #2 0x00007ffff7bbb77c in rad_assert_fail (file=0x475202 "src/main/process.c", line=1843, expr=0x475adf "request->server_cs != NULL") at src/main/util.c:468 #3 0x000000000044756d in request_setup (ctx=0xeeb9e0, listener=0x9e97b0, packet=0xeeba40, client=0xd418b0, fun=0x410f10 <rad_authenticate>) at src/main/process.c:1843 #4 0x00000000004471fb in request_receive (ctx=0xeeb9e0, listener=0x9e97b0, packet=0xeeba40, client=0xd418b0, fun=0x410f10 <rad_authenticate>) at src/main/process.c:1740 #5 0x000000000041f64c in auth_socket_recv (listener=0x9e97b0) at src/main/listen.c:1906 #6 0x000000000044e752 in event_socket_handler (xel=0xedd4c0, fd=55, ctx=0x9e97b0) at src/main/process.c:4563 #7 0x00007ffff7977905 in fr_event_loop (el=0xedd4c0) at src/lib/event.c:636 #8 0x00000000004506ad in radius_event_process () at src/main/process.c:5458 #9 0x0000000000434d62 in main (argc=2, argv=0x7fffffffe618) at src/main/radiusd.c:584 (gdb) Norbert Wegener