perhaps you can use the shun command. this will reset the connection but also will block future connections from the source IP matching the ports and protocol specified in the shun ..
"Step 1 If necessary, view information about the connection by entering the following command:
hostname# show conn
The security appliance shows information about each connection, such as the following:
TCP out 64.101.68.161:4300 in 10.86.194.60:23 idle 0:00:00 bytes 1297 flags UIO
Step 2 To shun connections from the source IP address, enter the following command:
hostname(config)# shun src_ip [dst_ip src_port dest_port [protocol]] [vlan vlan_id]
If you enter only the source IP address, then all future connections are shunned; existing connections
remain active.
To drop an existing connection, as well as blocking future connections from the source IP address, enter
the destination IP address, source and destination ports, and the protocol. By default, the protocol is 0 for IP.
Step 3 To remove the shun, enter the following command:
hostname(config)# no shun src_ip [vlan vlan_id] "
I hope it helps ... please rate if it it does !!!
