unable to block port on MacBook Pro

[yfeldman]

I am trying to block the process that is listening upon the port 9110 on my
MacBook Pro in order to simulate network interruption.
 If I have the following rule:
    -------------------------------------------------------------------
     block drop quick on ALL proto tcp from any to any port = 9110 
    --------------------------------------------------------------------
 my second process has successfully communicated with the blocked port, and
the client has successfully sent requests to the blocked process. The best I
could achieve is blocking all process communications with these list of
rules:
  ---------------------
    block drop in all
    block drop out all
 ---------------------

 However, it is not exactly what I need. Am I missing anything? Any
commnets/suggestion will be appreciated. Here is my lsof command output:

   >> lsof -i | grep 9110 
   java      41243  yfe  132u  IPv6 0x1e7d5327e0e36555      0t0  TCP
192.168.1.68:58772->192.168.1.68:9110 (ESTABLISHED)
   java      41243  yfe  145u  IPv6 0x1e7d5327e0f43035      0t0  TCP
192.168.1.68:58777->192.168.1.68:9110 (ESTABLISHED)
   java      41244  yfe  133u  IPv6 0x1e7d5327e116eab5      0t0  TCP
192.168.1.68:58747->192.168.1.68:9110 (ESTABLISHED)
   java      41244  yfe  147u  IPv6 0x1e7d5327e0e3a075      0t0  TCP
192.168.1.68:58756->192.168.1.68:9110 (ESTABLISHED)
   java      41253  yfe  201u  IPv6 0x1e7d5327e0e38595      0t0  TCP *:9110
(LISTEN)
   java      41253  yfe  278u  IPv6 0x1e7d5327e0e39055      0t0  TCP
192.168.1.68:9110->192.168.1.68:58747 (ESTABLISHED)
   java      41253  yfe  279u  IPv6 0x1e7d5327e4a195b5      0t0  TCP
192.168.1.68:9110->192.168.1.68:58756 (ESTABLISHED)
   java      41253  yfe  280u  IPv6 0x1e7d5327e5560035      0t0  TCP
192.168.1.68:9110->192.168.1.68:58772 (ESTABLISHED)
   java      41253  yfe  281u  IPv6 0x1e7d5327e0f43af5      0t0  TCP
192.168.1.68:9110->192.168.1.68:58777 (ESTABLISHED)




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