Same Error: https://forums.unraid.net/topic/186646-unraid-web-gui-inaccessible-with-error-500/

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syslog

Sep 22 07:56:39 NAS nginx: 2025/09/22 07:56:39 [error] 4739#4739: *88870 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 192.168.0.3, server: , request: "GET /Main HTTP/1.1", subrequest: "/auth-request.php", upstream: "fastcgi://unix:/var/run/php-fpm.sock:", host: "192.168.0.2"
Sep 22 07:56:39 NAS nginx: 2025/09/22 07:56:39 [error] 4739#4739: *88870 auth request unexpected status: 404 while sending to client, client: 192.168.0.3, server: , request: "GET /Main HTTP/1.1", host: "192.168.0.2"
Sep 22 07:56:39 NAS nginx: 2025/09/22 07:56:39 [error] 4739#4739: *88872 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 192.168.0.3, server: , request: "GET /favicon.ico HTTP/1.1", subrequest: "/auth-request.php", upstream: "fastcgi://unix:/var/run/php-fpm.sock:", host: "192.168.0.2", referrer: "http://192.168.0.2/Main"
Sep 22 07:56:39 NAS nginx: 2025/09/22 07:56:39 [error] 4739#4739: *88872 auth request unexpected status: 404 while sending to client, client: 192.168.0.3, server: , request: "GET /favicon.ico HTTP/1.1", host: "192.168.0.2", referrer: "http://192.168.0.2/Main"

I found why this error occurred,

origin /usr/local/emhttp/

root@NAS:/usr/local/emhttp# ls -alh
total 37K
drwxr-xr-x 1 root root 80 Jun 22 09:17 ./
drwxr-xr-x 1 root root 60 Jun 22 09:17 ../
-rw-r--r-- 1 root root 1.6K Nov 16 2023 auth-request.php
lrwxrwxrwx 1 root root 5 Nov 16 2023 boot -> /boot/
-rw-r--r-- 1 root root 15K Nov 16 2023 favicon.ico
drwxr-xr-x 1 root root 60 Nov 16 2023 languages/
lrwxrwxrwx 1 root root 8 Nov 16 2023 log -> /var/log/
-rw-r--r-- 1 root root 6.6K Nov 16 2023 logging.htm
-rw-r--r-- 1 root root 1.5K Feb 3 2024 login.php
lrwxrwxrwx 1 root root 4 Nov 16 2023 mnt -> /mnt/
drwxr-xr-x 1 root root 120 Jun 22 09:17 plugins/
-rw-r--r-- 1 root root 1.7K Jan 23 2025 redirect.htm
-rw-r--r-- 1 root root 26 Nov 16 2023 robots.txt
lrwxrwxrwx 1 root root 17 Nov 16 2023 state -> /var/local/emhttp/
-rw-r--r-- 1 root root 3.0K Nov 16 2023 update.htm
-rw-r--r-- 1 root root 5.9K Aug 28 2024 update.php
lrwxrwxrwx 1 root root 15 Nov 16 2023 webGui -> plugins/dynamix/

error then

root@NAS:/usr/local/emhttp# ls -alh
total 0
drwxr-xr-x 1 root root 320 Sep 22 04:30 ./
drwxr-xr-x 1 root root 60 Jun 22 09:17 ../
drwxr-xr-x 1 root root 60 Nov 16 2023 languages/
drwxr-xr-x 1 root root 140 Jun 22 09:17 plugins/
lrwxrwxrwx 1 root root 15 Nov 16 2023 webGui -> plugins/dynamix/

I do not know why some files removed..

Edited September 22, 2025Sep 22 by KDY

I found why this error occurred,

This happened entirely because of my mistake.

I use a plugin called user.script.

It's a simple file-moving script like the one below.

#!/bin/bash

shopt -s nullglob

SRC="/mnt/cache/recorders"
DST="/mnt/user/backup/recorders"

for cam in cam1 cam2 cam3 cam4; do
    files=( $(ls -1 "$SRC"/${cam}_*.mp4 2>/dev/null | sort) )
    count=${#files[@]}

    if (( count > 1 )); then
        for ((i=0; i<count-1; i++)); do
            f="${files[$i]}"
            mv "$f" "$DST/"
        done
    fi
done

At first glance, it doesn’t seem problematic, but if the SRC directory doesn’t actually exist, this becomes a serious issue.

I think the ls command is pointing to /usr/local/emhttp/ and moving those files to DST.

This wasn’t a problem with user.script or unraid, it was my fault for writing dumb code.