The Tez UI attempts to connect to Timeline Server using the same host as the Tez UI by default. This means that if the UI is hosted on localhost, the Timeline Server URL is assumed to be http(s)://localhost:8188 and the Resource manager web url is assumed to be http(s)://localhost:8088.

The Tez UI requires that the corresponding changes are configured in scripts/configs.js (within the extracted tez-ui.war), should the Timeline Server or Resource manager be hosted on another host. In this case, you need to uncomment the following lines and set the hostname and port to correctly. timelineBaseUrl maps to YARN Timeline Server and RMWebUrl maps to YARN ResourceManager.

// timelineBaseUrl: 'http://localhost:8188',
// RMWebUrl: 'http://localhost:8088',