Can`t connect to MAPDL process #4311
Description
🤓 Before submitting the issue
- I have visited the Troubleshooting section.
- I have searched among the existing issues.
- I am using a Python virtual environment.
- I am using the latest version of PyMAPDL and its dependencies (fully updated virtual environment). You can update them using
pip install --upgrade --upgrade-strategy eager ansys-mapdl-corein your activated virtual environment.
🔍 Description of the bug
Hello everyone!
I have been using pymapdl for a long time. I have got some error recently. My python can`t connect to mapdl instance. I have tried follow things:
- Just launch MAPDL instance from simple code using "launch_mapdl" func
- Launch MAPDL using "launch_mapdl" func and change ips, ports, licenses. I changed every argument I could. Nothing changed.
- I tried launch mapdl instance from cmd like - "path\to\ansys" -grpc and connect to this instance from pycharm and from python which is started im cmd. Nothing changed.
Also i reinstall PyCharm, Python and Ansys and it doesn't help.
I don't know what i can do. I think i try everything and i don't know what to do.
it's strange, but command
launch_mapdl()
really start MAPDL instance, but can not connect to this instance
🕵️ Steps To Reproduce
from ansys.mapdl.core import launch_mapdl
mapdl = launch_mapdl()💻 Which Operating System are you using?
Windows
🐍 Which Python version are you using?
3.12
💾 Which MAPDL version are you using?
2024R1
📝 PyMAPDL Report
Show the Report!
PyAnsys Software and Environment Report
-------------------------------------------------------------------------------
Date: Wed Nov 19 02:39:13 2025 UTC
OS : Windows (10 10.0.19045 SP0 Multiprocessor Free)
CPU(s) : 20
Machine : AMD64
Architecture : 64bit
RAM : 47.8 GiB
Environment : Python
GPU Vendor : NVIDIA Corporation
GPU Renderer : NVIDIA GeForce RTX 4070/PCIe/SSE2
GPU Version : 4.5.0 NVIDIA 560.94
Python 3.12.3 (tags/v3.12.3:f6650f9, Apr 9 2024, 14:05:25) [MSC v.1938 64
bit (AMD64)]
ansys.mapdl.core : 0.70.2
numpy : 2.2.6
platformdirs : 4.5.0
scipy : 1.16.3
grpc : 1.67.1
ansys.api.mapdl.v0 : Version unknown
ansys.mapdl.reader : 0.55.1
google.protobuf : 4.25.8
ansys-math-core : 0.2.4
matplotlib : 3.10.7
pyvista : 0.46.4
pyiges : 0.3.2
tqdm : 4.67.1
ansys-tools-visualization_interface : Module not found
pandas : 2.3.3
ansys_sphinx_theme : Module not found
ansys.acp.core : 0.2.1
ansys.dpf.composites : 0.7.0
ansys.dpf.core : 0.14.1
ansys.dpf.post : 0.10.0
ansys.fluent.core : 0.34.1
ansys.fluent.visualization : Module not found
ansys.fluent.parametric : Module not found
ansys.geometry.core : 0.11.0
ansys.hps.client : 0.10.1
ansys.math.core : 0.2.4
ansys.mechanical.core : 0.11.30
ansys.meshing.prime : 0.9.1
ansys.modelcenter.workflow : 0.1.1
ansys.motorcad.core : 0.7.4
ansys.openapi.common : 2.3.2
ansys.optislang.core : 1.0.0
ansys.platform.instancemanagement : 1.1.2
ansys.pyensight.core : 0.10.9
ansys.rocky.core : 0.3.2
ansys.seascape : 0.2.0
ansys.simai.core : 0.3.3
ansys.systemcoupling.core : 0.10.1
ansys.turbogrid.core : 0.4.6
ansys.tools.report : 0.9.0
ansys.tools.versioning : 0.7.0
pyaedt : 0.18.1
pyedb : 0.54.0
pygranta : 2025.2.1
pytwin : 0.9.2
appdirs : 1.4.4
-------------------------------------------------------------------------------
Ansys Environment Report
-------------------------------------------------------------------------------
Ansys Installation
******************
No Ansys installations provided
Ansys Environment Variables
***************************
P_SCHEMA C:\Program Files\ANSYS Inc\v241\AISOL\CADIntegration\Parasolid\PSchema
AWP_LOCALE241 en-us
ANSYSLMD_LICENSE_FILE 1055@localhost
ANSYSLIC_DIR C:\Program Files\ANSYS Inc\Shared Files\licensing
ANSYS241_DIR C:\Program Files\ANSYS Inc\v241\ANSYS
CADOE_LIBDIR241 C:\Program Files\ANSYS Inc\v241\CommonFiles\Language\en-us
AWP_ROOT241 C:\Program Files\ANSYS Inc\v241
📝 Installed packages
Show the installed packages!
# PASTE HERE THE OUTPUT OF `python -m pip freeze` here
📝 Logger output file
Show the logger output file.
DEBUG - GRPC_127.0.0.1:50053 - mapdl_core - __init__ - Logging set to DEBUG
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - __init__ - Creating channel to 127.0.0.1:50053
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _create_channel - Opening insecure channel at 127.0.0.1:50053
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.IDLE
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.CONNECTING
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _multi_connect - Connection attempt 1
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.TRANSIENT_FAILURE
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _multi_connect - Connection attempt 2
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _multi_connect - Connection attempt 3
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _multi_connect - Connection attempt 4
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _multi_connect - Connection attempt 5
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _read_stds - Reading stdout
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _read_stds - Read stdout: []
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _read_stds - Reading stderr
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _read_stds - Read stderr: []
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _check_stds - MAPDL exited without stderr.
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - _check_stds - MAPDL exited without stdout.
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - __init__ - The error wasn't caught by the post-mortem checks.
DEBUG - GRPC_127.0.0.1:50053 - mapdl_grpc - __init__ - []
ERROR - pymapdl_global - launcher - launch_mapdl - An error occurred when connecting to MAPDL.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "D:\PostgraduateSt\NN_Prog_Solver\NNTO_Python\.venv\Lib\site-packages\ansys\mapdl\core\launcher.py", line 1726, in launch_mapdl
raise exception
File "D:\PostgraduateSt\NN_Prog_Solver\NNTO_Python\.venv\Lib\site-packages\ansys\mapdl\core\launcher.py", line 1713, in launch_mapdl
mapdl = MapdlGrpc(
^^^^^^^^^^
File "D:\PostgraduateSt\NN_Prog_Solver\NNTO_Python\.venv\Lib\site-packages\ansys\mapdl\core\mapdl_grpc.py", line 476, in __init__
raise err # Raise original error if we couldn't catch it in post-mortem analysis
^^^^^^^^^
File "D:\PostgraduateSt\NN_Prog_Solver\NNTO_Python\.venv\Lib\site-packages\ansys\mapdl\core\mapdl_grpc.py", line 468, in __init__
self._multi_connect(timeout=timeout)
File "D:\PostgraduateSt\NN_Prog_Solver\NNTO_Python\.venv\Lib\site-packages\ansys\mapdl\core\mapdl_grpc.py", line 615, in _multi_connect
raise MapdlConnectionError(
ansys.mapdl.core.errors.MapdlConnectionError: Unable to connect to MAPDL gRPC instance at dns:///127.0.0.1:50053.
Reached either maximum amount of connection attempts (5) or timeout (45 s). The MAPDL process seems to be alive (PID: 43964) but PyMAPDL cannot connect to it.