i crawl a site with nutch 1.4, i understand that nutch dosen't crawl all links in this site. i have no filter and no limit rule to crawling. for example nutch never crawl this link:

<http://www.irna.ir/News/30786427>/سوء-استفاده-از-نام-كمیته-امداد-برای-جمع-آوری-رای-در-مناطق-محروم/سياسي/

if i give this link to nutch to crawl, nutch never crawl this link. this site is farsi and not English.
how i can crawl this link?