So the first connect request isn't successfull or is still running (from your step1)?
And then you are start another connect request?

Can you provide a small example code (eventually commented)? That would clear some questions and missunderstandings.

if you have questions use the discussions feature of this repo (your post is not related to the topic...) if you open a new discussion please provide consoleoutput and stacktrace, just posting your code is not enough

@AndreasHeine Sorry, I will correct it.

@joristork The asyncua thread doesn't hang, it was never told to stop. The exception is raised in the self.tloop.post(self.aio_obj.disconnect()) call in asyncua.sync.Client.disconnect. This means that the code that stops the thread loop is never called. Quick fix: manage the thread loop yourself.

Pretty sure it's just a case of 'forgot to check if the task exists that I'm trying to cancel'. My PR allowed me to gracefully close the clients without first establishing a connection.

Thank you @dan-sel and @Randelung , I will test your suggestions and feed back.

I solved / worked around this by simply checking that my client is connected before calling the disconnect() method.

My criterion for checking it is connected:

if (                                                                                                                                                                                           
    hasattr(self._client, "uaclient")                                                                                                                                                          
    and hasattr(self._client.uaclient, "protocol")                                                                                                                                             
    and self._client.uaclient.protocol                                                                                                                                                         
    and (self._client.uaclient.protocol.state == UASocketProtocol.OPEN)                                                                                                                      
):