Freeradius 3.0.13-8.el7_4 and external syslog server

[Matthew Newton]

On Mon, 2018-02-26 at 09:39 +0100, Bram Assendorp wrote:
> Within the radiusd.conf I have changed the "logdir" and "destination"
> parameter to "syslog"

Just set "destination" to "syslog". logdir will still be used for on-
disk logs by some modules (e.g. rlm_linelog) unless you also configure
them to send to syslog.

Your errors are coming from rlm_detail, which uses ${logdir} as the
location for the detail files.

-- 
Matthew