A service port can be shared by several separate connections. Before reading a reconstructed exchange, identify the connection that corresponds to the event you are investigating.

Start with a non-sensitive sample already approved for analysis. Choose two known connections to the same service port and record a packet from each. Give them distinct working labels so switching between them cannot accidentally substitute another user’s activity for the intended example.

Follow the chosen connection

Select the first packet and use Analyze, Follow, TCP Stream, or its corresponding packet context-menu action. Wireshark selects the stream containing that packet and applies an appropriate display filter. Inspect the stream identifier and endpoints before interpreting the reconstructed contents.

Repeat from the second connection and compare its different stream identity with your recorded packet and endpoints.

The follow dialog’s Close action leaves its stream filter applied; Back restores the previous display filter. Choose deliberately when returning to the packet list, and check the filter before concluding that other traffic disappeared.

Keep the question narrow

For the exercise, prepare a two-row note: starting packet, connection endpoints, selected stream and expected event. If one row points to the wrong exchange, correct the selection before making any interpretation of its content.

Following TCP does not automatically decrypt encrypted application content. Record that limitation instead of inventing a message from unreadable characters.

Use the smallest relevant excerpt when reporting the observation. An entire reconstructed conversation can contain details unrelated to the incident, even when the first selected packet looked harmless. The accepted result links the intended event to the right stream and leaves the reviewer aware of the filter in effect when they return.

Sources: Wireshark official guide.