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Check to ensure that the FRONT_END_SERVER setting in TRIRIGAWEB.properties is set correctly.  BIRT will use this setting basically as the base URL for all links/images etc. that it generates; it should typically be the same base URL that end users would expect to use to access the application (e.g. if the app server is running on http://yourappserver:8001, but your users access the application through a web server at http://mywebserver, then the latter would be the correct setting for the FRONT_END_SERVER).