Open ports

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On Dreamhost servers one finds many open ports,

$ nmap
Starting Nmap 4.68 ( ) at 2008-10-09 07:18 CST
Interesting ports on (
21/tcp  open     ftp
22/tcp  open     ssh
25/tcp  open     smtp
80/tcp  open     http

The above services are well known and understood, but

111/tcp filtered rpcbind 
113/tcp open     auth
548/tcp open     afp
587/tcp open     submission
691/tcp open     resvc

perhaps are for a few of the websites on the shared server, thus all websites on the server will appear to have them open too, though not apparently a security risk...