Hey forum,
I’ve noticed something a bit weird happening from time to time (but it’s pretty irregular). The display or content of a shared PDF link (https[ : ]//my[ . ]webserver[ . ]com/**s/**5ffdshhh33dLbffy) won’t show up after multiple attempts, even without the need for a user login. The page just stays blank. Only after refreshing the page does the content load properly. This happens both over LTE and Wi-Fi.
Here’s an overview of the system:
- Provider: NetCup VPS 3000 ARM G11
- Hardware: VPS, 12 vCores, 24 GB RAM
- Server OS: Linux 6.8.0-55-generic aarch64
- Affected Client OS: iOS 18.3.2 / Brave, Edge, Safari
- Affected Client OS: Windows Server 2016 / Edge
- Nextcloud Version on Server: 30.0.8
- PHP Version: 8.3.19
- Database: mysql 10.11.11
- NGINX Version: nginx/1.24.0
- Redis 7.0.15
- Any recent server updates? 03-2025
- Have you checked the logs from Nextcloud and the system? Yes, but I’m not sure what to look for.
- When does the error occur? After multiple attempts to open a shared PDF link (e.g., on the 1st, 10th, or 15th try), the PDF display stays blank.
- LTE has full signal, and nothing should be blocked by the firewall on Wi-Fi.
- Has anyone else experienced this or does anyone have an idea what could be causing it? I can rule out the NC Bruteforce App since it’s currently disabled, and even if it wasn’t, the page would eventually load correctly after a refresh. So I can also rule out the CrowedSec Bruteforce.
- Recently, I received feedback that the issue was also reproducible with the browser on Windows – in this case, with Microsoft Edge (Version 135.0.3179.54 (Official Build) (64-bit)).
Anyone have any ideas?
The Redis server says this when accessing the PDF, so I think the cache itself is fine:
redis /var/run/redis/redis-server.sock> Monitor
OK
1744104844.945893 [0 unix:/run/redis/redis-server.sock] "AUTH" "(redacted)"
1744104844.946011 [1 unix:/run/redis/redis-server.sock] "SELECT" "1"
1744104844.946084 [1 unix:/run/redis/redis-server.sock] "TTL" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19"
1744104844.946192 [1 unix:/run/redis/redis-server.sock] "INCRBY" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19" "1"
1744104844.946306 [1 unix:/run/redis/redis-server.sock] "EXPIRE" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19" "3600"
1744104844.953073 [1 unix:/run/redis/redis-server.sock] "EVALSHA" "cf0e94b2e9ffc7e04395cf88f7583fc309985910" "1" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19" "1"
1744104844.953181 [1 lua] "get" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19"
1744104844.953222 [1 lua] "del" "f9c9c53f77f443e263f525950c258285/lockfiles/88cb059c046011f627ded822b3ac3c19"