Using Tools in the PDM, you can use [show conn local x.x.x.x] This will show all connections associated with the internal address x.x.x.x.
While you can't clear particular connections, you can clear the xlates associated with the connection to cause the connection to be closed.
[clear xlate local x.x.x.x] would clear any translation and all related connections for the IP. If you're using PAT, you can use the extended form of the command to specificy the actual ports of the translation which would clear a single connection that was associated with it.
I also wanted to add that you can use the [shun] command to kill a particular connection/session. In addition to blocking the next packet even if the connection is already open, the Pix will close the existing connection when using the [shun] command.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...