[authn_dbd:error] [pid 21308] [client xxxxx] AH01656: Query execution error looking up 'mylogin' in database []

[Note] Aborted connection 5000 to db: 'httpauthdb' user: 'httpauth' host: 'xxx.xxx.xxx.xxx' (Got an error reading communication packets)

<Location /private>
  AuthName 'My private space'
  AuthType Basic
  AuthBasicProvider dbd
  AuthDBDUserPWQuery "SELECT password FROM clients WHERE username = %s"
  AuthzDBDQuery "SELECT groups FROM clients WHERE username = %s"
  Require dbd-group mygroup
</Location>

DBDriver mysql
DBDParams "sock=/var/run/mysqld/mysqld.sock,user=httpauth,dbname=httpauthdb,pass=xxxxxxxx"
DBDMin  4
DBDKeep 2
DBDMax  10
DBDExptime 300
DBDPersist On

Server version: Apache/2.4.25 (Debian)
Server built:   2017-01-25T22:59:26
Server's Module Magic Number: 20120211:67
Server loaded:  APR 1.5.1, APR-UTIL 1.5.4
Compiled using: APR 1.5.2, APR-UTIL 1.5.4
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

mysql  Ver 14.14 Distrib 5.7.17-13, for debian-linux-gnu (x86_64) using  6.3