502 Bad Gateway nginx/1.18.0 (Ubuntu) while trying to create character on Gesior 2012 accmaker

[SugarCame]

Hi everyone. when im trying to create character on gesior 1.5 acc maker tfs1.5 im getting on face.

502 Bad Gateway​

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nginx/1.18.0 (Ubuntu)

totaly no idea how to fix it. reinstalled it plenty of times, still not working.

There is an nginx error code.

2024/02/15 22:01:13 [error] 1558#1558: *549 upstream sent too big header while reading response header from upstream, client: 87.172.57.231, server: example.com, request: "POST /?subtopic=accountmanagement&action=createcharacter HTTP/1.1", upstream: "fastcgi://unix:/run/php/php8.1-fpm.sock:", host: "igielkanalata.pl", referrer: "Accountmanagement - Forgotten (http://igielkanalata.pl/?subtopic=accountmanagement)"