user interface – Python error – IDLEs subprocess didnt make connection. Either IDLE cant start or personal firewall software is blocking connection

user interface – Python error – IDLEs subprocess didnt make connection. Either IDLE cant start or personal firewall software is blocking connection

Delete all newely created .py files in the directory with Python. for example random.py, end.py – that was my problem that caused the same notification window. Reason in filename conflicts.

It may be a common problem that happens when you have in you current directory a file with same name on one from Python (references : Cant run Python via IDLE from Explorer [2013] – IDLEs subprocess didnt make connection)

It seems it can also happen if you have incorrect environment variables such as HOMEPATH USERPROFILE (references : Issue 14576: IDLE: inconsistent use of HOMEDRIVE, HOMEPATH, and USERPROFILE on Windows)

Ive found another related question : Python IDLE subprocess error?

My advice if the answer is not there : google may be your friend ! The 3 clues above come from there 🙂

user interface – Python error – IDLEs subprocess didnt make connection. Either IDLE cant start or personal firewall software is blocking connection

The fix is here .

Open task manager, kill pythonw.exe, if you find 2 instances or more. Should work after that.