Detected multiple authentication failures and invalid user attempts in LF_SMTPAUTH from IP address 1 ...
show moreDetected multiple authentication failures and invalid user attempts in LF_SMTPAUTH from IP address 177.44.194.1 on [PT] Tucano Node.
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(smtpauth) Failed SMTP AUTH login from 177.44.194.1 (BR/Brazil/Rio Grande do Sul/Santa Cruz do Sul/1 ...
show more(smtpauth) Failed SMTP AUTH login from 177.44.194.1 (BR/Brazil/Rio Grande do Sul/Santa Cruz do Sul/177-44-194-1.avato.com.br): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SMTPAUTH; Logs: 2026-07-23 19:50:39 dovecot_plain authenticator failed for H=(Labmax) [177.44.194.1]:61077: 535 Incorrect authentication data
2026-07-23 19:52:05 dovecot_plain authenticator failed for H=(Labmax) [177.44.194.1]:1414: 535 Incorrect authentication data ([email protected])
2026-07-23 19:52:12 dovecot_plain authenticator failed for H=(Labmax) [177.44.194.1]:1587: 535 Incorrect authentication data (set_id=illidan)
2026-07-23 19:52:23 SMTP call from [177.44.194.1]:2373 dropped: too many syntax or protocol errors (last command was "?\034?\032?\027?\031?\034?\033?\030?\032?\026?\016?\r?\v?\f?\t?", NULL)
2026-07-23 19:52:25 dovecot_plain authenticator failed for H=(Labmax) [177.44.194.1]:1904: 535 Incorrect authentication data
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Port Scan
Anonymous
(pop3d) Failed POP3 login from 177.44.194.1 (BR/Brazil/177-44-194-1.avato.com.br)
Brute-Force
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