Attempt to visit the Department of Agricultural Economics website at agrar.hu-berlin.de. If the website fails to load, identify and report the specific error message displayed. Do not attempt any further actions or navigation if the site is inaccessible.
Attempt to navigate to http://agrar.hu-berlin.de/ If navigation fails, identify the specific error message displayed. Report the outcome of the navigation attempt and the error message if applicable.
Confirm that the website http://agrar.hu-berlin.de/ is inaccessible. State the exact error message encountered: 'net::ERR_NAME_NOT_RESOLVED'.