I am somewhat new to computer networking and I created a little project where I have two computers connected to an Ethernet switch, forming a small network. Computer server ( has a mail-server program installed on it (communigate server) and the other computer client ( tries to access mails via an https interface. (I verified both PCs can ping each other).

On client, I am logging in and out of the web interface while recording traffic on both PCs via wireshark.

What I noticed is that server does not seem to receive any packets at all from client. (No packets from

On the client machine, I do find lots of TCP packets, but they all have the address (both as source and destination) and there are no packets from

When I repeat this experiment with the server ethernet cable disconnected, client is unable to access the web-interface, so I assume there should be some sort of connection between the two?

Does anyone understand why WireShark does not record any packets from client to server?

  • Check the Wireshark filters - if client and server are communicating, there must be traffic on the wire. Is the client maybe connected wirelessly in parallel?
    – Zac67
    Nov 22, 2019 at 10:40
  • 1
    Make sure you are capturing data on the correct interface on the PC. You may be capturing on the loopback or other virtual interface instead of the Ethernet interface.
    – Ron Trunk
    Nov 22, 2019 at 11:32
  • 1
    So it turned out that I indeed captured the traffic on the Loopback Adapter... Thank you very much for helping!
    – Mantabit
    Nov 22, 2019 at 11:59
  • You should write your own answer to the question, so others can benefit from your experience.
    – Ron Trunk
    Nov 22, 2019 at 12:54

1 Answer 1


So it turned out that I simply chose the incorrect network adapter in Wireshark as shown in the picture below:

enter image description here

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