Problem with ‘UploadThumb’ node – Authorization failed inside workflow

Help me Build my Workflow
1

Hello n8n community, my name is Patrícia Lira. I’m running n8n self-hosted on my own VPS (Hostinger) and I’m facing a persistent issue:

Error: Problem in node ‘UploadThumb’ – Authorization failed - please check your credentials

What I have tried:

Step 1: The Base (VPS Server)

  • I reinstalled Ubuntu 24.04 from scratch on my Hostinger VPS, creating a 100% clean environment.

  • n8n was installed via Docker professionally, with automatic saving working and no security errors.

Step 2: Investigation (Hostinger/CDN)

  • Terminal tests (curl) showed that the problem is not with n8n.

  • The Hostinger CDN was clearing my credentials before they reached WordPress, causing the 401 Unauthorized error.

  • Adjustments suggested by Hostinger support in the .htaccess file were applied, but the problem persists.

Step 3: WordPress Site

  • Security plugins were disabled to eliminate interference.

  • Technical adjustments in .htaccess were made to accept the credentials from n8n.

  • Important note: When testing only the WordPress node in isolation, it works correctly, but inside the full workflow, it returns the Authorization failed error.

Despite all these steps, the error persists.

I would greatly appreciate any guidance or suggestions on additional configurations in n8n that could fix the Authorization failed issue in the UploadThumb node within workflows.

Thank you very much for your help!

Best regards,
Patrícia Lira