[BUG] Adding more than 213 feeds causes nginx issue - "502 Bad Gateway"

[BryanWall]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

If I add more than 213 feeds it breaks the Subscription Management page (?c=subscription). Trying to visit the subscription management pages results in "502 Bad Gateway". If I delete the 214th feed, the Subscription Management page starts working again.

Google AI suggests that it's an issue with nginx proxying and suggesting making changes to the size of several proxy buffer settings.

I opened an issue with FreshRSS and one of their maintainers said that their official Docker does not use nginx and they suspect that the issue is related to nginx proxying.

Expected Behavior

FreshRSS should be able to handle thousands of feeds without issue

Steps To Reproduce

1. I am using this Docker from the official image in the Unraid package manager / store
2. I have been using it without issue for several months. When I added the 214th feed the Subscription Management page stopped working and reports "502 Bad Gateway". If I delete the 214th feed the page starts working again.

I have tried many combinations of adding/removing feeds to different categories and the 214th feed triggers the issue no matter where or how I add it.

Environment

- OS: Unraid 7.2.4
- The Docker image was installed from the Unraid official package manager/store

CPU architecture

x86-64

Docker creation

docker run
  -d
  --name='freshrss'
  --net='bridge'
  --pids-limit 2048
  -e TZ="America/New_York"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="Voyager"
  -e HOST_CONTAINERNAME="freshrss"
  -e 'PUID'='99'
  -e 'PGID'='100'
  -e 'UMASK'='022'
  -l net.unraid.docker.managed=dockerman
  -l net.unraid.docker.webui='http://[IP]:[PORT:80]'
  -l net.unraid.docker.icon='https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/freshrss-logo.png'
  -p '8180:80/tcp'
  -v '/mnt/disks/ssd1/appdata/freshrss':'/config':'rw,slave' 'lscr.io/linuxserver/freshrss'
c03578b1280f687ad490693e2cebe437d067d479a39eb5d83d314a3ed026804c

Container logs

[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] 02-default-location: skipped
[migrations] done
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    99
User GID:    100
───────────────────────────────────────
Linuxserver.io version: 1.28.1-ls302
Build-date: 2026-04-19T13:50:37+00:00
───────────────────────────────────────
    
using keys found in /config/keys
[custom-init] No custom files found, skipping...
[ls.io-init] done.

[github-actions]

Thanks for opening your first issue here! Be sure to follow the relevant issue templates, or risk having this issue marked as invalid.

[j0nnymoe]

First please update your configs that are showing 3 years out of date at this point and test again.

Also is this happening when accessing directly or via your reverse proxy? (If so, what solution are you using?

[BryanWall]

I noticed the config updates as I was posting the issue and updated those. I also updated the container logs above to what they are now after updating the configs. The issue still occurs after replacing all of the configs with the latest versions.

I am not using any reverse proxy. I am accessing the container on my local network.

FWIW, these are the settings that Google AI recommended. I am not an nginx expert so I don't know if these make sense or not.

nginx
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;