TCP: Treason uncloaked

Hello

one of our servers seems under attack. In dmesg, it shows

TCP: Treason uncloaked! Peer 203.113.161.127:1377/80 shrinks window 1801780131:1801784427. Repaired.
TCP: Treason uncloaked! Peer 161.57.231.33:2622/80 shrinks window 2655921439:2655933284. Repaired.
TCP: Treason uncloaked! Peer 203.113.162.154:1275/80 shrinks window 224138556:224141588. Repaired.
TCP: Treason uncloaked! Peer 203.113.162.154:1275/80 shrinks window 224218580:224220348. Repaired.

I have suspended the account under attack, but is there anyway to protect from this kind of attack?

thanks

 

 

 

 

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