Fix OpenProject “Invalid host_name”

Starting with OpenProject 14.3, hostname checking has become more strict (see config/environments/production.rb:182 ff.). When running OpenProject behind an Apache reverse proxy, requests may arrive with different source hostnames. By default, the OPENPROJECT_HOST__NAME environment variable is only set to the public hostname served by Apache. To resolve this issue, add:

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ProxyPreserveHost on

to your Apache VirtualHost configuration and reload the service:

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$ sudo systemctl reload apache2.service

Alternatively, you can work around this issue by adding:

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export OPENPROJECT_ADDITIONAL__HOST__NAMES=["127.0.0.1:6000"]

to /etc/openproject/conf.d/other and then run:

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$ sudo openproject configure

to apply the changes. After this, restart OpenProject.