Extension Manager time out after updating to 15.0

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Hi,

I’ve upgraded my xwiki instance to 15.0. The only problem is that the extension manager page keeps timing out and this is what I’ve obtained from the error log.

2023/02/17 11:33:21 [error] 40377#40377: *5863 upstream timed out (110: Connection timed out) while reading response header from upstream, client: ip, server: domain, request: "GET /bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=XWiki.Extensions HTTP/1.1", upstream: "http://127.0.0.1:8080/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=XWiki.Extensions", host: "domain", referrer: "https://domain/bin/admin/XWiki/XWikiPreferences?category=1"

For the instance, I’m currently using Debian 11 and used tomcat 9 with nginx reverse proxy. I appreciate if anyone have an idea what’s going on. Thanks!

Reverse proxy nginx config

    access_log /var/log/nginx/access_ssl.log;
    error_log /var/log/nginx/error_ssl.log;

    gzip            on;
    gzip_comp_level 4; # increase for better compression (values 1 to 9, 1 = fastest, 9 = slowest/best compression)
    gzip_types      text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript; # compress multiple mime types
    gzip_disable    "msie6"; # disable gzip for IE<=6
    gzip_vary       on; # send Vary: Accept-Encoding header
    gzip_proxied    any; # enable compression for proxied requests4

    location / {
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Scheme $scheme;
        proxy_redirect off;
        if (!-f $request_filename) {
            proxy_pass http://127.0.0.1:8080;
            break;
        }
    }

    location ~ /.well-known {
        allow all;
    }

    location = /robots.txt {
        alias /var/www/html/robots.txt;
    }

Best Regards,
Leon