Help Center/ ModelArts/ Troubleshooting/ Training Jobs/ Internet Access Issues/ Error Message "Network is unreachable" Is Displayed in Logs
Updated on 2025-06-06 GMT+08:00
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Error Message "Network is unreachable" Is Displayed in Logs

Symptom

When PyTorch is used, the following error message will be displayed in logs after pretrained in torchvision.models is set to True: 
'OSError: [Errno 101] Network is unreachable'

Possible Causes

The possible causes are as follows:

For security purposes, ModelArts internal training machines are not allowed to access the Internet.

Solution

  1. Change the pretrained value to False, download the pre-trained model, and load the path to this model. 
    import torch
import torchvision.models as models

model1 = models.resnet34(pretrained=False, progress=True)
checkpoint = '/xxx/resnet34-333f7ec4.pth'
state_dict = torch.load(checkpoint)
model1.load_state_dict(state_dict)
  2. Use the local PyCharm to remotely access notebook for debugging.

Summary and Suggestions

Before creating a training job, use the ModelArts development environment to debug your training code and minimize migration errors.
Parent topic: Internet Access Issues