Microsoft-ds and H.323/Q.931? Which services are these?

["Jim Perrin" <jperrin (at) gmail.com>]

> (The 1667 ports scanned but not shown below are in state: closed)
> PORT     STATE    SERVICE
> 445/tcp  filtered microsoft-ds

This is part of samba/cifs microsoft filesharing.

> 1720/tcp filtered H.323/Q.931

This is voice over ip type stuff.

These ports are not open, they're filtered.  This can mean your ISP is
silently blocking them for you. For the MS port this can protect
against viruses. For the h323 port, this can protect the ISP from you
running your own VOIP setup and not paying them for the privilege.

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