docs(admin): add nginx tips for Unix socket proxy and HTTP/3 host detection#14991
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…ection Two new entries in the nginx Tips and tricks section: 1. Unix domain socket trusted proxy: when an upstream proxy (Caddy, HAProxy, another nginx) passes requests via a Unix socket, nginx sets REMOTE_ADDR to the literal string "unix:" which Nextcloud cannot parse as a trusted proxy IP. Document the set_real_ip_from unix: fix. 2. HTTP/3 untrusted domain error: nginx may not forward HTTP_HOST to PHP-FPM under HTTP/3 (QUIC), causing Nextcloud to reject the request. Document the fastcgi_param HTTP_HOST $host; fix. Fixes #12908 Relates to #12196 Signed-off-by: skjnldsv <skjnldsv@protonmail.com>
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Sources for the socket part https://help.nextcloud.com/t/trusted-proxy-on-unix-domain-socket/162670 |
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📖 Documentation Preview📄 1 changed documentation pageLast updated: Thu, 21 May 2026 11:07:42 GMT |
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☑️ Resolves
What and why
Two new entries added to the nginx "Tips and tricks" section:
1. Unix domain socket trusted proxy (#12908)
When an upstream proxy (Caddy, HAProxy, another nginx) passes requests to
Nextcloud's nginx via a Unix domain socket,
REMOTE_ADDRis set to theliteral string
unix:which Nextcloud cannot parse as a trusted proxy IP.This causes a crash (
Unsupported operand types: bool & string in IpAddress.php).Fix:
set_real_ip_from unix:;+real_ip_header X-Forwarded-For;in theserver block listening on the socket. Confirmed working by multiple users.
2. HTTP/3 "access through untrusted domain" (#12196)
Under HTTP/3 (QUIC), nginx may not forward
HTTP_HOSTto PHP-FPM, causingNextcloud to show the untrusted domain error even for correctly configured
trusted_domains.Fix: explicitly add
fastcgi_param HTTP_HOST $host;alongside the otherfastcgi_paramdirectives.🖼️ Screenshots
No visual/layout changes — prose and code block additions only.
✅ Checklist
codespellor similar and addressed any spelling issues