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Server Blocked
Jan 24, 2017 7:59 AM
Joined: Jan 07, 2008
Posts: 15
To server admins.
I recently received a long notice (in German) and the server was blocked by the company I rent the 'box' from. It is not a managed server so they can't or won't help. I have it back up at the moment but they expect me do something, close ports I think, but I'm at a loss as to which ports I can close and which ones need to be open.

Anyone had anything like this before? An extract of the message:-

Sir or Madam,

Multicast DNS (mDNS) is used for resolving host names to IP addresses within small networks that do not include a local DNS server. It is implemented for example by the Apple 'Bonjour' and Linux/BSD 'Avahi'(nss-mdns) services. mDNS uses port 5353/udp.

In addition to disclosing information about the system/network,mDNS services openly accessible from anywhere on the Internet can be abused for DDoS reflection attacks against third parties.

Please find below a list of affected systems hosted on your network... it goes on.
The notice was issued apparently from ''

Last edited by: brewmeisterman Jan 24, 2017 8:12 AM