Unable to activate Add-on visibility in Sidebar

Hi there,

I’m unable to activate the visibility of two dedicated Add-ons anymore (Zigbee2Mqtt, vscode).
I’m getting following error:

“Error saving addon configuratoin, unkonown error see supervisor”

Supervisor Log:

“24-02-08 11:04:40 ERROR (MainThread) [supervisor.homeassistant.api] Error on call Cannot connect to host ssl:False [Connect call failed (‘’, 8123)]”

I restarted my system several times, but nothing changed. I restored already from an older backup.
I edited manually the addons.json and set “ingres” to = true, but nothing.
Further i repaired my supervisor via “ha supervisor repair”, but nothing changed.
I can access the add-on webinterface via the ingres link in my browser.

Do you have any tipps for me?

Thank you