I've downloaded p4v (for windows 64), in the open connection window, in the Server section I write : codes.zimbra.com:2666,
in the user : public, and leave the workspace blank, then i press OK, and after a while i get the following error :

Connect to server failed; check $P4PORT.
TCP connect to codes.zimbra.com:2666 failed.
connect: codes.zimbra.com:2666: WSAETIMEDOUT

note : i've also tried with the p4 command line, as written in the Building Zimbra using Perforce wiki section, but I get the same error ???

Thanks for your replies,