Cannot read artiq core log

Hi, we are using variant CU3. For some reason, we cannot read artiq core log. There is no output from the command aqctl_corelog. We receive the following error when running artiq_coremgmt log

Traceback (most recent call last):
  File "C:\ProgramData\Miniconda3\envs\artiq\Scripts\artiq_coremgmt-script.py", line 9, in <module>
    sys.exit(main())
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\site-packages\artiq\frontend\artiq_coremgmt.py", line 159, in main
    print(mgmt.get_log(), end="")
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\site-packages\artiq\coredevice\comm_mgmt.py", line 138, in get_log
    self._write_header(Request.GetLog)
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\site-packages\artiq\coredevice\comm_mgmt.py", line 87, in _write_header
    self.open()
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\site-packages\artiq\coredevice\comm_mgmt.py", line 64, in open
    self.socket = initialize_connection(self.host, self.port)
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\site-packages\artiq\coredevice\comm.py", line 25, in initialize_connection
    sock = socket.create_connection((host, port))
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\socket.py", line 808, in create_connection
    raise err
  File "C:\ProgramData\Miniconda3\envs\artiq\lib\socket.py", line 796, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

Our artiq hardware is connected through intranet and the core address is set to an intranet IP address 172.31.1.150. We are using conda and our artiq version is 6.7621.d9b01ed8.

Please help us, thank you!