Actually I'm experimenting with dockingports because before I sent a spacecraft into orbit which later should be dockable, I'm experimenting I got it correct how the ports are working.

Fortunately I did so...

Actually my problem is, I have a scenario where 2 spacecrafts are docking each other on the launchway. but after I click to detatch, the port detatches from the counterpart as expectet, but.... it also detatches itself from the spacecraft...

This is a screenshot of the current testing setup:



is telling this is a mistake often done by beginners, but doesn't tell how to avoid this / do it correctly.

So my question simply is, how to dock correctly, in a way detatching just detatches the ports from each other but none of both from any spacecraft part?

  • Are you sure you put them the right way around? The more detailed side is supposed to be outside.
    – Philipp
    Feb 24, 2016 at 19:20
  • @Philipp: I'm going to upload a screenshot
    – Zaibis
    Feb 24, 2016 at 19:24
  • @Philipp: screenshot for clarification is added.
    – Zaibis
    Feb 24, 2016 at 19:28
  • Pretty sure your only problem is that you're using detach instead of undock. The option to undock may only be on one of the two ports. However, it's been too long since I last played for me to post this as an answer and be confident that it's correct.
    – MBraedley
    Feb 25, 2016 at 12:22
  • Can you post another screenshot of just after the undocking which shows which piece is disconnected from your ship? I can't get a feel of what you're explaining because I can't visualize it.
    – Tim S.
    Feb 29, 2016 at 21:06

2 Answers 2


Based on your response to my comment, this is almost definitely a bug. Perhaps you saved/exited/reloaded the game fixed it? I've had cases where after assembly, a ship will act in a non-expected way, but after saving and reloading the game, it never happens again. It did always have to do with attachment points though.

Since you can't reproduce it and don't already have a screenshot, I'd not recommend submitting a bug with the devs, just be happy it's not doing it anymore.


A docking port has an "outside" (the side that attaches and detaches) and an "inside" (the side that stays attached) face. In your screenshot, the two outside faces are mated together correctly. This means that you can undock and then dock again without issue.

The common mistakes made are:

  • Putting a docking port on backwards so that the outside face (that will disconnect) is attached to there you want your docking port to remain. Just pay attention to the part, it's usually pretty clear which side is which, and a experimentation on the launch pad will quickly identify it if you are in doubt.

  • Using two docking ports when you only need one. A docking port can be assembled with any other part "docked" to it. The only things docking ports are good for are:

    • Disconnecting two parts (one port needed)
    • Joining two parts once launched (two ports needed).
  • 1
    I don't think you understand the question being asked. Your answer is just saying what is supposed to happen, but doesn't address what is actually happening.
    – MBraedley
    Mar 1, 2016 at 1:01

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