Setting up Wireshark to capture packets for the first time can be tricky.
Here are some common pitfalls:
-
You need to have root / Administrator privileges to start a live
capture.
-
You need to choose the right network interface to capture packet data
from.
-
You need to capture at the right place in the network to see the
traffic you want to see.
-
... and a lot more!.
If you have any problems setting up your capture environment, you should
have a look at the guide mentioned above.