[stunnel-users] Windows 2016 Server: [!] bind: Address already in use (WSAEADDRINUSE) (10048)

Małgorzata Olszówka Malgorzata.Olszowka at stunnel.org
Wed Jun 6 11:00:55 CEST 2018

> If I run stunnel I regular get the below error:
>  >>> [!] bind: Address already in use (WSAEADDRINUSE) (10048) <<<<
> [!] Error binding service [smtps] to 
> <>
> [!] 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?


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