Solved: ASA 5500-x Duplicate TCP SYN from inside.

saleff · ‎04-04-2016

4

Apr 04 2016

15:35:14

419002

x.x.x.x

65378

x.x.x.x

3911

Duplicate TCP SYN from inside:x.x.x.x/65378 to inside:x.x.x.x/3911 with different initial sequence number

I am getting a ton of these messages. How do I stop this?

aydinnmu1 · ‎04-05-2016

Hi,

i think you are under an attack. Find the attackers and victims and kill them all.

Just joke.

Seriusly, you resist some attackers. You can shun all of them with that command shun A.B.C.D.

You can write ACL deny all traffics from attackers.

Best regards.

aydinnmu1 · ‎04-05-2016

Hi,

i think you are under an attack. Find the attackers and victims and kill them all.

Just joke.

Seriusly, you resist some attackers. You can shun all of them with that command shun A.B.C.D.

You can write ACL deny all traffics from attackers.

Best regards.

saleff · ‎04-05-2016

Thanks for the help