Configure Windows firewall blocking behaviour

Solution 1:

While you have the option to reject connection attempts with an RST or an ICMP-destination-unreachable message with many packet filters, the Windows Firewall seems not to be configurable at this point. The difference in observed behavior is probably due to a disabled firewall - in this case the TCP/IP stack itself would simply send a RST response if the IDENT port is not open.

As a workaround for your case I would recommend exactly this - do add port 113/tcp to the list of exceptions for Windows Firewall. As long as nothing is listening at port 113, you will see the desired RST response from the stack instead of a a series of SYN timeouts and retransmits.

Solution 2:

Reason - http://technet.microsoft.com/en-us/library/dd448557%28WS.10%29

Fix - http://msdn.microsoft.com/en-us/library/ff720058%28v=prot.10%29.aspx

If Keys/values don't exist - create it. After changes need to restart windows firewall service.