There could indeed be a general IP block.
Wait for an Avast Team Member to appear here and give the final verdict for your site,
and eventually unblock…

SiteVet report for your hoster: http://sitevet.com/db/asn/AS44112 157 bad URLs.
Server info proliferation: overflow exploitable nginx 1.9.12
See risk status: http://toolbar.netcraft.com/site_report?url=http://77.222.57.253

polonus