HTTPD Running as a LB for Graylog Pair gives a white page

Graylog Central (peer support)
2

Hello @msweikata && welcome

Only thing I can see different is the RequestHeader set X-Graylog-Server-URL

<VirtualHost *:80>
    ServerName graylog.example.org
    ProxyRequests Off
    <Proxy *>
        Order deny,allow
        Allow from all
    </Proxy>

    <Location />
        RequestHeader set X-Graylog-Server-URL "http://graylog.example.org/"
        ProxyPass http://127.0.0.1:9000/
        ProxyPassReverse http://127.0.0.1:9000/
    </Location>

</VirtualHost>

I don’t use Apache/httpd any more but I have old configurations saved that might help.

#<VirtualHost *:80>
#    ServerName graylog.domain.com
#    ProxyRequests Off
#    <Proxy *>
#        Order deny,allow
#        Allow from all
#    </Proxy>
#    <Location />
#        RequestHeader set X-Graylog-Server-URL "http://graylog.domain.com/"
#        ProxyPass http://127.0.0.1:9000/
#        ProxyPassReverse http://127.0.0.1:9000/
#    </Location>
#</VirtualHost>




<VirtualHost *:443>
    ServerName graylog.enseva-labs.net
    ProxyRequests Off
    SSLEngine on
    SSLOptions +StrictRequire
    SSLCertificateFile "/etc/graylog/graylog3-certificate.pem"
    SSLCertificateKeyFile "/etc/graylog/graylog3-key.pem"
    RewriteEngine on
    RewriteCond %{HTTP_HOST} ^10\.10\.10\.70$ [NC,OR]
    RewriteRule .* https://graylog.domain.com:9000 [R,L]
    <Proxy *>
        Order deny,allow
        Allow from all
    </Proxy>

    <Location />
        RequestHeader set X-Graylog-Server-URL "https://graylog.domain.com/"
        ProxyPass  https://graylog.domain.com:9000/
        ProxyPassReverse  https://graylog.domain.com:9000/
    </Location>

</VirtualHost>

Maybe check out this post