Hi,

the current sphinx.conf suggestion provided by phpBB 3.1.6 contains a binlog_path with an ending slash like:

binlog_path = /var/lib/sphinxsearch/data/

However the Sphinx documentation is showing no slash:

binlog_path = /var/data
http://sphinxsearch.com/docs/current/conf-binlog-path.html

This is causing messages like:

.bg WARNING: binlog: failed to unlink /var/lib/sphinxsearch/data//binlog.001: No such file or directory (remove it manually)

and a not removed binlog.001 file after killing the searchd. After fixing the path to:

binlog_path = /var/lib/sphinxsearch/data

the WARNING disappears and the binlog.001 is also deleted after killing the searchd.