Subnostr

I have this issue as well.

Was it a force close or cooperative.

Does umbrel show you a closing transaction?

If yes, is the closing transaction also visible publicly at mempool.space?

I close from the Umbrel Lightning UI, I guess it's a cooperative close, and no closing tx shows yet.

maybe it's because my peer is not responding, so I wander if there's way to change to force close?

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If I were you I would install a proper channel management tool like Thunderhub or Ride the lightning (RTL).

And see the channel closing status in that.