[notimetorelax]

Looks like redirect from naked domain to www.krebsonsecurity.com is missing. This seem to work better http://www.krebsonsecurity.com/

[dotancohen]

    $ dig www.krebsonsecurity.com | grep IN
    ;www.krebsonsecurity.com.       IN      A
    www.krebsonsecurity.com. 267    IN      A       127.0.0.1

[semi-extrinsic]

Clicking your link doesn't work either for me (connection refused).

[pfg]

DNS might still be propagating. krebsonsecurity.com pointed to 127.0.0.1 while the site was offline.

[darfs]

Works fine in Germany also.

[EugeneOZ]

works fine from Russia. Welcome!