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Many void queries recorded in the mysql error log

CONCEPT21May 1 2017 — edited May 5 2017

Hello all the Mysql users,

My system is Ubuntu 16.04 amd64, Mysql server 5.7.18.

The mysql error log is flooded with these void queries.  They happen about twice per 2 minutes.  How do I find out which program or connection is responsible for them?  

2017-05-01T17:27:15.908503Z 3 [Note] Access denied for user 'root'@'localhost' (using password: NO)

2017-05-01T17:29:17.320641Z 23 [Note] Access denied for user ''@'localhost' (using password: NO)

2017-05-01T17:29:17.321477Z 24 [Note] Access denied for user ''@'localhost' (using password: NO)

2017-05-01T17:31:17.404669Z 36 [Note] Access denied for user ''@'localhost' (using password: NO)

2017-05-01T17:31:17.405018Z 37 [Note] Access denied for user ''@'localhost' (using password: NO)

2017-05-01T17:33:17.482127Z 47 [Note] Access denied for user ''@'localhost' (using password: NO)

2017-05-01T17:33:17.482912Z 48 [Note] Access denied for user ''@'localhost' (using password: NO)
This post has been answered by CONCEPT21 on May 5 2017
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Added on May 1 2017
#mysql-faqs, #mysql-user-groups
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