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Kern.log peer unexpectedly shrunk window

If you get the kind of error, it means that some hackers have been able to login into your server through an exploit or a backdoor. You have to add a jail to Fail2Ban. Install Fail2Ban if it is not yet already done.

Dec  8 13:35:18  kernel: [6114223.972059] Peer  unexpectedly shrunk window 3517493258:3517493263 (repaired)

Dec  8 13:35:20  kernel: [6114225.860020] Peer  unexpectedly shrunk window 4250428389:4250428394 (repaired)

Create shrunk-window.conf :

# nano /etc/fail2ban/filter.d/shrunk-window.conf

Add :

[Definition]

failregex = ^.*Peer \:.* unexpectedly shrunk window.*repaired+

ignoreregex =



# nano /etc/fail2ban/jail.conf

Add :

[shrunk-window]

enabled = true

filter = shrunk-window

logpath = /var/log/kern.log

port = all

maxretry = 1

The same with jail.local :

nano /etc/fail2ban/jail.local

Add :

[shrunk-window]

enabled = true

filter = shrunk-window

logpath = /var/log/kern.log

port = all

maxretry = 1

Restart Fail2Ban :

/etc/init.d/fail2ban restart

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Kern.log peer unexpectedly shrunk window

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