Log In fail on Zammad

<VirtualHost *:80>
    # replace 'localhost' with your fqdn if you want to use zammad from remote
    ServerName 192.168.16.90

    ## don't loose time with IP address lookups
    HostnameLookups Off

    ## needed for named virtual hosts
    UseCanonicalName Off

    ## configures the footer on server-generated documents
    ServerSignature Off

    ProxyRequests Off
    ProxyPreserveHost On

    <Proxy 127.0.0.1:3000>
        Require local
    </Proxy>

    ProxyPass /assets !
    ProxyPass /favicon.ico !
    ProxyPass /apple-touch-icon.png !
    ProxyPass /robots.txt !
    # legacy web socket server
    ProxyPass /ws ws://127.0.0.1:6042/
    # action cable
    ProxyPass /cable ws://127.0.0.1:3000/cable
    ProxyPass / http://127.0.0.1:3000/

    # change this line in an SSO setup
#    RequestHeader unset X-Forwarded-User

    DocumentRoot "/opt/zammad/public"

    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>

    <Directory "/opt/zammad/public">
        Options FollowSymLinks
        Require all granted
    </Directory>

</VirtualHost>