I write a python script used to reversely forward a port. I use pywin32 to convert the python codes as a win10 service. The service runs ok when python version is 3.10. However, after I upgrade the python from version 3.10 to 3.12, The service stop immediatly everytime I start it. I don’t know why. Can anyone give some suggestions? Thanks a lot. The following is my python codes:

import time
import sys
import subprocess as sp

import win32serviceutil  # ServiceFramework and commandline helper
import win32service  # Events
import servicemanager  # Simple setup and logging

class MyService:
    def stop(self):
        self.running = False

    def run(self):
        rport=55009
        cmd=f'ssh  -fNR {rport}:127.0.0.1:3389 username@remotehost -p 22'
        cmd1='ssh -tt  username@remotehost -p 22  "netstat -tpa | grep '**:{} **'"'.format(rport)
        while True:
            a=sp.run(cmd1,capture_output=True,shell=True).stdout.decode("utf-8") 
            # print('one turn')
            if f":{rport}" not in a:
                try:
                    p=sp.Popen(cmd,shell=True)
                    p.wait(2)
                except sp.TimeoutExpired:
                    p.kill()
                except:
                    print('execution failed')
            elif not "ESTABLISHED" in a:
                cmd2=""ps aux | grep '**xiaoya**'| awk '{print $2}' | xargs -r kill""
                cmd2="ssh -tt  username@remotehost -p 22 "+cmd2
                try: 
                    a=sp.run(cmd2,shell=True)
                    p=sp.Popen(cmd,shell=True)
                    p.wait(2)
                except sp.TimeoutExpired:
                    p.kill()
                except:
                    print('execution failed')
            time.sleep(5*1)
            servicemanager.LogInfoMsg("Service running...")


class MyServiceFramework(win32serviceutil.ServiceFramework):
    _svc_name_ = 'autossh1'
    _svc_display_name_ = 'autossh1'

    def SvcStop(self):
    
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
        self.service_impl.stop()
        self.ReportServiceStatus(win32service.SERVICE_STOPPED)

    def SvcDoRun(self):
        
        self.ReportServiceStatus(win32service.SERVICE_START_PENDING)
        self.service_impl = MyService()
        self.ReportServiceStatus(win32service.SERVICE_RUNNING)
        # Run the service
        self.service_impl.run()


def init():
    if len(sys.argv) == 1:
        servicemanager.Initialize()
        servicemanager.PrepareToHostSingle(MyServiceFramework)
        servicemanager.StartServiceCtrlDispatcher()
    else:
        win32serviceutil.HandleCommandLine(MyServiceFramework)

if __name__ == '__main__':
    init()