Ai Enhancer Upload Error

[tuami]

hi, We are using Corona 13 and c4d 2025, and uploading does not work on one of our computers when using ai enhancer. We have completely reinstalled Corona and temporarily disabled the firewall as a test, but we still keep getting an "Upload Error" in the Corona VFB. Uploading images to Collab works fine in general, but not when using the AI Enhancer.

[tuami]

Can no one help us with this issue?? I've already tried the following:

Completely reinstalled Cinema 4D 2025 (including deleting all files from the AppData folders)
Completely reinstalled Corona and all Chaos products (including deleting all related files from the AppData folders)
Checked Windows updates (everything is up to date)
Verified all drivers
Tested various simple scenes → always results in an upload error
Checked the network and confirmed the internet connection is working
Searched the forums to see if others are experiencing the same issue
EXR files are correctly created in \AppData\Local\Temp\collaboration

The only thing that works is a regular upload (without using the AI Enhancer to the cloud).
Unfortunately, no error messages are shown in the console.

The computer is identical to another one where everything works. It’s on the same network with the same DNS settings and same servers — the only difference is the internal IP address, which I’ve already tested and ruled out.
The only real hardware difference is the GPU: mine uses an NVIDIA card, the other system has an AMD GPU — but that really shouldn’t be the issue, since the AI processing runs on Chaos' servers, not locally.

We also have two licenses, both of which are recognized correctly. There are no issues regarding licensing.

Any help or suggestions would be greatly appreciated. Thank you!

[maru]

Sorry for the lack of response. I will check with our dev team to see if they have some ideas on what might be causing this or if there is a log that we could check.
I wanted to ask about any differences between the PC where it doesn't work and the ones where it does, but you explained everything already.
Just for clarity, are you using any 3rd party antivirus/firewall software?

[tuami]

Hello Maru,
thank you for your reply. I had already suspected that no one was responding because we’re probably the only ones (so far) experiencing this issue.
The PCs are exactly the same, we’re working with the same servers, and no, there is no antivirus program or firewall in place.
At the moment, it just doesn’t make any sense — it works perfectly on my machine, but not on the other one.
In the coming days, we’ll completely reinstall Windows on that PC, and I’ll report back if there are any updates.
If anyone has any suggestions in the meantime, feel free to share them here.

Tuami