Pi-Hole and Openhab on one rpi4 port 53 blocked

Hi there,
I am just migrating from domoticz to openhab and have a question regarding the usage of Pi-Hole and openhab on one rpi4. I know this is not how it should be, but for the time I need my other rpi to run my old domoticz install.

Pi-Hole fails to start the DNS Service with this error

FTL failed to start due to failed to create listening socket for port 53: Address already in use

Is openhabian using port 53 for some other cause? And how can i get it to stop.
It will only be a temporary solution.

Tank you for your help.

Run

sudo netstat -tulpn | grep 53

this shows if port 53 is in LISTEN mode and which process is running on that port.

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