[GNS3 3.0.0] An error occurs while importing an image when using a connection with SSL encryption

[nwhisper2014]

Describe the bug
If SSL encryption is configured, an error appears when trying to import a appliance image. For example: “Could not upload image vyos-1.4.0-kvm-amd64.qcow2: Connection closed (HTTP code None)”

If you close the window with the error by pressing the “OK” button and immediately re-import the image, the import completes successfully and the error message does not appear.

GNS3 version and operating system (please complete the following information):

• OS: GN3 gui on Arch Linux
• GNS3 version: 3.0.0
• Remote controller with SSL encryption (ESXi, KVM)

To Reproduce
Steps to reproduce the behavior:

1. Configure SSL encryption on the gsn3 controller
2. In gns3-gui configure connection using https
3. Open the New Template dialog, select "Install an appliance from the GNS3 server (recommended)"
4. Select any template that does not have an image on the controller.
5. Click the Import button and select the image
6. See error

Screenshots or videos

Error message when trying to import a vyos image:

Remote controller preferences:

[grossmj]

@nwhisper2014 do you still have the issue in v3.0.2?

[nwhisper2014]

@nwhisper2014 do you still have the issue in v3.0.2?

No, it's fine now.

[grossmj]

Ok great, I must have fixed this unintentionally when I fixed the other issue ;)

[nwhisper2014]

When importing an image using Image Manager, a similar problem occurs. For example, if I click the Upload button in Image Manager, select an image and click Open, the error message Error while uploading images to the controller appears. In details: Connection closed (HTTP code None).

If I close the error message and repeat the import without leaving Image Manager, everything works successfully.

I am getting this error on GNS3 versions up to 3.0.2.