Everything has been working fine for me until this morning when I could not access everything from my school domain (anything with xyz.edu). I'm on Mac OX 10.9. The hosts file looks OK to me:       localhost broadcasthost
54 ::1             localhost
55 fe80::1%lo0 localhost

Preferences -> DNS looks normal:

Whenever I go to website, I see the message "This webpage is not available Error code: ERR_ADDRESS_INVALID". I could join the school wifi network but I just cannot access anything under my school domain.

I can run "host website_name" and get the IP address of the site but weird enough I cannot access the site on any browsers I have (Chrome, Firefox, Safari). I've also tried "sudo dscacheutil -flushcache" but nothing changed.

I'm really clueless how to fix this. Can someone please help?


  • Is your school domain .local by any chance? – VL-80 Dec 3 '13 at 1:30
  • no, Nikolay. It's .edu. In fact I have problem with a series of edu sites, including princeton.edu, gwu.edu, umd.edu, gmu.edu. Not all the .edu though, eg. harvard.edu works for me. It looks like the academy is abandoning me :) – chepukha Dec 3 '13 at 4:34
  • I see. What happens if you try to access it using IP address, not hostname? – VL-80 Dec 3 '13 at 14:26
  • the same with accessing via IP address. I don't think my problem is with DNS because I can access other websites and I can run host command to obtain IP address. I guess the problem must be the site was added to some blocking list that is hidden somewhere. But I don't know exactly what it is and where it could be – chepukha Dec 3 '13 at 14:51
  • 1
    this answer on ServerFault might be related to your problem. Try to follow instructions given in this answer. – VL-80 Dec 3 '13 at 15:54

As user Cavver explained in his answer flushing the routing table (route -n flush) and recreating it again (by whatever procedure is typical for you) solves the problem.

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