Socket not always closed

[thomas-huegel]

Describe the bug
Sometimes - but not always - the socket is not well closed after server interruption (^C).
The socket does not appear in the output of ss -tln.

To Reproduce
Steps to reproduce the behavior (not deterministically):

1. Start your server
2. Interrupt it through Ctrl+C
3. Restart your server

Expected behavior
I would expect the socket to be closed every time.

Screenshots

ERROR - bind: The given address is already in use. 
Bind attempt failed:  Socket.bind: Binding socket failed.
Retrying. Might take 10-15 seconds.
.ERROR - bind: The given address is already in use. 
.ERROR - bind: The given address is already in use. 
.ERROR - bind: The given address is already in use. 

Desktop (please complete the following information):

• Linux x64