I have an FWSM running Version 4.0(8). When i setup a packet capture in one of the contexts it doesnt capture any packets. I have created an access list for the interesting traffic and applied it to the capture. I know the traffic is going trhough the context however it doesnt show in the capture.
Have you assigned the capture to the interfaces?
capture <capture_name> interface inside !(or whatever interface you are trying to capture on)
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Yes. When you make any changes to the ACL that you have applied to the capture you must delete the capture and re-enter it. It then starts to capture packets.