[Oisf-users] SSL Connections breaking in nfqueue mode.

[David Sussens]

Albert,

Can you please share your iptables/nftables rule base configs with us.
That might help to determine what the problem is here.

David Sussens.


On Tue, Apr 10, 2018 at 10:18 PM, Albert Whale <
Albert.Whale at it-security-inc.com> wrote:

> Can someone please tell me why the connecting to HTTPS websites are
> problematic when using the nfqueue run mode?  This doesn't happen when I am
> using af-packet mode.
>
> In fact in nfqueue mode, I also get the following alerts from fast.log:
>
> 04/10/2018-13:05:49.504292  [**] [1:2210007:2] ITS Safe STREAM 3way
> handshake SYNACK with wrong ack [**] [Classification: Generic Protocol
> Command Decode] [Priority: 3] {TCP} 17.249.105.246:443 ->
> 192.168.1.180:61378
> 04/10/2018-13:05:50.534691  [**] [1:2210007:2] ITS Safe STREAM 3way
> handshake SYNACK with wrong ack [**] [Classification: Generic Protocol
> Command Decode] [Priority: 3] {TCP} 17.249.105.246:443 ->
> 192.168.1.180:61378
> 04/10/2018-13:05:51.570889  [**] [1:2210007:2] ITS Safe STREAM 3way
> handshake SYNACK with wrong ack [**] [Classification: Generic Protocol
> Command Decode] [Priority: 3] {TCP} 17.249.105.246:443 ->
> 192.168.1.180:61378
> 04/10/2018-13:05:53.632130  [**] [1:2210007:2] ITS Safe STREAM 3way
> handshake SYNACK with wrong ack [**] [Classification: Generic Protocol
> Command Decode] [Priority: 3] {TCP} 17.249.105.246:443 ->
> 192.168.1.180:61378
>
>
> This is the error displayed in safari when I am running in-line IPS mode:
>
> Any ideas or suggestions?
> --
> --
>
> Albert E. Whale, CEH CHS CISA CISSP
> Phone: 412-515-3010 | Email: Albert.Whale at IT-Security-inc.com
> Cell: 412-889-6870
>
>
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