If I run stunnel I regular get the below error:
...
 >>> [!] bind: Address already in use (WSAEADDRINUSE) (10048) <<<<
[!] Error binding service [smtps] to 192.168.10.62:11465 <http://192.168.10.62:11465>
[!] Could not bind any accepting port
...

I had the same problem with the previous versions aswell.

To temporary resolv the problem I have to change the listen port to another number. Reread the config file and let the stunnel GUI open. Then all is working until I close the GUI (not each time but most of).
My system:
- Windows 2016 Server
- stunnel-5.46
- stunnel installed as service and GUI


Hello Martin,
Could open up a command prompt in Administrator mode and type „neststat -abn” in order to find out which process is listening upon the selected port? Maybe stunnel service is working?

Regards,
Małgorzata
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