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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 (192.168.1.1) has a mail-server program installed on it (communigate server) and the other computer client (192.168.1.2) 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 192.168.1.2)

On the client machine, I do find lots of TCP packets, but they all have the address 127.0.0.1 (both as source and destination) and there are no packets from 192.168.1.1

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?

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  • 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 '19 at 10:40
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    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 '19 at 11:32
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    So it turned out that I indeed captured the traffic on the Loopback Adapter... Thank you very much for helping! – Mantabit Nov 22 '19 at 11:59
  • You should write your own answer to the question, so others can benefit from your experience. – Ron Trunk Nov 22 '19 at 12:54
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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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