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exo.base.url is used to generate links in some cases, like a topic link in an email notification.
Generally you need to configure it to the base URL that users use to access eXo Platform. For example, if you use a reverse proxy, the URL should be the proxy's host.
The following is the default configuration. To change it, edit exo.properties file.
# The Server Base URL is the URL via which users access eXo platform. All links created (for emails etc) will be prefixed by this URL. # The base URL must be set to the same URL by which browsers will be viewing your eXo platform instance. # Sample: exo.base.url=https://intranet.mycompany.com exo.base.url=http://localhost:8080