I did read from the FAQ of WireShark, though, that WinPcap might not capture packets with erroneous CRC. My Ethernet adapter is that of Realtek PCI GBE Family Controller, and the driver is up to date.

I also made sure that I’m running with an Administrator account, and the server and client are allowed through my firewall as well. I’ve seen many people using WireShark with their network apps on the Qt forum, so the possibility of WireShark not being compatible with Qt seems quite slim. I’ve tried writing another server using a WinSock2 socket instead of the QTcpSocket, and still, WireShark can’t detect any packets when the server and client have successfully exchanged data with each other. I’m pretty sure the packets are there if the server and client managed to receive data from each other, and I can use RawCap to sniff those packets as well. The strange thing is, WireShark can’t seem to capture any packets exchanged between the Qt server and client. These Qt server and client, both running locally on my own PC, can send strings of text to each other. We have a pair of Simple TCP Server/Client written with Qt5, using QTcpSocket and QTcpServer. To put it short, are there any scenarios where WireShark can fail to capture packets from and to a local machine?

I’m rather fresh with socket programming, and right now I needed some guidance as to where I should start tackling this problem.

Can wireshark capture localhost traffic