[mel4fun]

Hi,

Need some advise on the following error message :
TCP sequence validator: dropped packet with invalid ACK number

Fast facts
Gateway : Nokia IP 440 IPSO 3.7 Build 031
Checkpoint : R55

Host A : AIX box
Host B : Unix box
Host C : Destination server

FW policy

Source Destination TCP Port Action
Host A -> Host C -> TCP 3140 -> Accept (error message)
* Telnet from host A via TCP 3140. No connection

Host B -> Host C -> TCP 3140 -> Accept (no error message)
* Telnet from Host C via TCP 3140, connection is working fine.

Both Host A & Host B are sitting in the same IP segment (same switch).
With all other parameters remaining contstant (same destination, same TCP port), we cannot identify where goes wrong.

The fact is that using the same TCP port, one host is working but not the other.

Could someone assist to advise what could be the issue and any work around.
Thank you.