[Dovecot] dovecot-auth: gkr-pam: error looking up user information for: IP ?

[babajaga]

I am receiving a lot of error messages
dovecot-auth: gkr-pam: error looking up user information for: <user>

Unfortunately, I do not see the IP of the remote client, trying to break in.
Is there any possibility to get it ? Would be useful to block the IP.
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