Install ARC BLAHP-logger:
{{{
svn co http://trac.grid.org.ua/repos/workarea/arc-misc/arc-blahp-logger /usr/libexec/arc/
mkdir /var/log/arc/accounting/
}}}

Configure ARC to call logger to write BLAHP log. In the {{{/etc/arc.conf}}} add following configuration and restart A-REX:
{{{
authplugin="FINISHED timeout=10,onfailure=pass /usr/libexec/arc/arc-blahp-logger /var/log/arc/accounting/blahp.log- %W %C %I %u ce.fqdn:2811/nordugrid-torque-"
}}}