api returned unexpected data - expected json body, got text/html

R

raeserfisk

New Member
Jan 22, 2026
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Hi!

I am running Proxmox Datacenter Manager 1.0.2 (via Unraid/Docker). Its working great (love the software!) and I've managed to add 1 Proxmox Backup Server host and 3 different Proxmox hosts without any issues.

When I try to add my 4th Proxmox host I am suddenly hit with "api returned unexpected data - expected json body, got text/html" when clicking next on the "Settings" page where i've added Remote ID and login token. It doesnt matter if I try to login and create token OR if I create a token at the Proxmox host and use that one.

I've installed all 4 Proxmox hosts in an identical way so I cant see any obvious differences between them that would explain this issue.
 
Could you post what version is the affected Proxmox VE is running? Thank you!
 
Is there a proxy between the PDM instance and the Proxmox VE instance?
 
sterzy said:
Is there a proxy between the PDM instance and the Proxmox VE instance?
Click to expand...
The PDM is behind a reverse proxy but that's the case with all the already added Proxmox hosts. The infrastructural settings are 100% identical between pve1 and pdm, pve2 and pdm, pve3 and pdm.. and so on. The now failing connection is behind pve4 and pdm. 1-3 + pbs is working fine.
 
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