With original sources from 1.7.1,

access_log syslog:server=192.168.2.8:514 main;

2014/05/23 18:55:30 [debug] 2100#2140: *1 http write filter 00000000
2014/05/23 18:55:30 [debug] 2100#2140: *1 http finalize request: 0, "/index.html?" a:1, c:2
2014/05/23 18:55:30 [debug] 2100#2140: *1 http request count:2 blk:0
2014/05/23 18:55:30 [debug] 2100#2140: *1 http finalize request: -4, "/index.html?" a:1, c:1
2014/05/23 18:55:30 [debug] 2100#2140: *1 set http keepalive handler
2014/05/23 18:55:30 [debug] 2100#2140: *1 http close request
2014/05/23 18:55:30 [debug] 2100#2140: *1 http log handler
2014/05/23 18:55:30 [debug] 2100#2140: add cleanup: 00557518
2014/05/23 18:55:30 [warn] 2100#2140: *1 send() to syslog failed while logging request, client: 192.168.2.8, server: localhost, request: "GET / HTTP/1.1", host: "192.168.2.27"
2014/05/23 18:55:30 [debug] 2100#2140: *1 run cleanup: 035A094C
2014/05/23 18:55:30 [debug] 2100#2140: *1 file cleanup: fd:424
2014/05/23 18:55:30 [debug] 2100#2140: *1 free: 035A0058, unused: 1138

A local port by nginx (which varies ea. 60627) is opened for UDP for 0.0.0.0 and remains open.

Seems somewhere conf values are lost.