QTcpServer(this)

[DAVC]

doh! Thank you so much, I was a bit tired when i wrote it.
I completely missed that it wasn't just a random:

qDebug() << "Did we get to this part of the code?"

qDebug() << "Did we get to this part of the code?"

To copy to clipboard, switch view to plain text mode 

Now it makes sense again!

I usually don't execute statements in a qDebug, this was purely because I at the time was uncertain that the connection ever got established. I just forgot to delete it again.
I will use your advice to save it in a variable and then pass it to qDebug to avoid a situation like this again, Thank you!

Best regards David

[ChrisW67]

Regarding the Qwt setup. Commonly you build Qwt and install it (make install) to put the resulting libs, includes etc into a configurable location (e.g. c:\Qwt-6.1.3). Then the instructions here, with Qwt as a feature, have worked for me. Nothing but "CONFIG += qwt" needed in the PRO file for a build, but the qwt.dll needs to be in the run-time PATH of the process in order for the result to run.