Hiya, 

Thank you for your message. 

I can confirm in your logs says that port number already exists and is being used. 

Therefore either find out what service using that port in question or change the port restart your stunnel 

Systemctl restart stunnel4 

Then to check systemctl status stunnel4 

Provide me logs again let's see if still face same issue. 

Please note: please make sure added port to incoming and outgoing port to your firewall if use one. 

Kind regards, 
Danny, - system engineer 

On Thu, 19 Jan 2023, 9:49 pm Mike Spooner, <mikes@aalin.co.uk> wrote:
The message "Address already in use" indicates the core problem. Something *else* is already attached to port 6661. Either another instance of stunnel, or some system service.

-- Mike


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