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Reason for failure:

EJB Exception: ; nested exception is: org.ieee.xplore.exception.SearchDaoException: HTTP Error 503 - Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=0&allgroups=1&offset=0&nbins=25&filter=AND%28OR%28p_Id%3a4500740%29%2cAND%28OR%283406%2c3408%29%2cNOT%284292746436%29%2cNOT%28OR%284293612683%2c+4293292639%29%29%29%29&irversion=640'. Query is arnumber=4500740; nested exception is: org.ieee.xplore.exception.SearchDaoException: HTTP Error 503 - Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=0&allgroups=1&offset=0&nbins=25&filter=AND%28OR%28p_Id%3a4500740%29%2cAND%28OR%283406%2c3408%29%2cNOT%284292746436%29%2cNOT%28OR%284293612683%2c+4293292639%29%29%29%29&irversion=640'. Query is arnumber=4500740