As the subject suggest, my question is simply, can Wireshark capture traffic between two programs through TCP ports on the same machine? I am of the opinion that this wouldn't go through the NIC and therefore perhaps it's outside of Wireshark's capabilities. I ask because I have already tried this and my PCAP doesn't appear to contain the packets that I'm interested in. Using NIRSoft's CurrPorts, I can see that one program's listening port has established connections with this other program, however, that program is saying that it can't establish a connection and I'm trying to figure out why. If it's in fact the case that it isn't possible, could someone recommend a program that can capture this traffic? Thank you.