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Home » Kerio User Forums » Kerio Connect » Stopping/reducing Bruteforce attacks (Account lockout for 5 minutes : really working ?!)
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userkerio1227

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Hello,
I am wondering if "Account lockout for 5 minutes after too many failures" option,
is working correctly, when I see the log details in my Kerio-connect server below.
I have latest kerio 9.0.4 running on Debian 7 - 64 bits.

You can see in the logs that IP 199.71.180.101 is attempting SMTP every ~15s despite the account blocking from this specific address.


[31/May/2016 10:29:16] Account lockout - user xxxxxx will be blocked for connections from IP address 199.71.180.101 for 5 minutes: too many failed logins from this IP address
[31/May/2016 10:29:29] Failed SMTP login from 199.71.180.101 with SASL method LOGIN.
[31/May/2016 10:29:32] SMTP: Invalid password for user xxxxxx. Attempt from IP address 199.71.180.101.
[31/May/2016 10:29:32] Account lockout - user xxxxxx will be blocked for connections from IP address 199.71.180.101 for 5 minutes: too many failed logins from this IP address
[31/May/2016 10:29:45] Failed SMTP login from 199.71.180.101 with SASL method LOGIN.
[31/May/2016 10:29:48] SMTP: Invalid password for user xxxxxx. Attempt from IP address 199.71.180.101.
[31/May/2016 10:29:48] Account lockout - user xxxxxx will be blocked for connections from IP address 199.71.180.101 for 5 minutes: too many failed logins from this IP address
[31/May/2016 10:30:01] Failed SMTP login from 199.71.180.101 with SASL method LOGIN.
[31/May/2016 10:30:04] SMTP: Invalid password for user xxxxxx. Attempt from IP address 199.71.180.101.
[31/May/2016 10:30:04] Account lockout - user xxxxxx will be blocked for connections from IP address 199.71.180.101 for 5 minutes: too many failed logins from this IP address


Is this normal behaviour?
Thanks in advance!

Version : 8.3.2 (3100)
Système d’exploitation : Debian GNU/Linux 7.6, x86_64
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Pavel Dobry (Kerio)

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