Appears this machine is infected.
It is currently physically residing in Australia according to a trace, when really, it is on a Russian Network.
More information here:
http://www.ip-adress.com/whois/91.212.226.7
The message is traffic INBOUND is being blocked.
The system is running an E.mail or Proxy server over a secure HTTP connection (https).
NGINX 0.8.36
Also, this IP address has been flagged many times as a Zombie, SPAM BOT, Virus host and distributor.
Likely on many blacklists and RBLs.
Thank Symantec for heeding the potential infection into your network...