Did you ever find your problem? We are having a weird issue similar to yours with a missing ack from the netscaler server.
We see syn,syn ack, then fin,ack.
We are having an missing ack.
Did you ever resolve this? I am running into the same thing but have the x9148 2nd gen modules. Any help would be great, figure it is not compatible with the FI as I am able to do port channels with 5Ks and with another MDS 9216i with the second gen ...
