Which ports should I open?

Discussion in 'Installation/Configuration' started by Geoinline, Nov 18, 2005.

  1. Geoinline

    Geoinline New Member

    Currently I have these ports open in my router (I've disabled ISPConfig firewall Management>Services>Firewall)

    FTP 21
    SSH 25
    DNS 53
    www 80
    ISPconfig 81
    POP3 110
    SSL(www) 443
    Webmin 10000

    When I do a port scan (Tools>Portscanner) I get this:

    Port 21 (tcp) is open (ftp)!
    Port 22 (tcp) is open (ssh)!
    Port 25 (tcp) is open (smtp)!
    Port 53 (tcp) is open (domain)!
    Port 80 (tcp) is open (www)!
    Port 81 (tcp) is open (unknown)!
    Port 110 (tcp) is open (pop3)!
    Port 143 (tcp) is open (imap2)!
    Port 443 (tcp) is open (https)!
    Port 953 (tcp) is open (unknown)!
    Port 993 (tcp) is open (imaps)!
    Port 995 (tcp) is open (pop3s)!
    Port 3306 (tcp) is open (mysql)!
    Port 48431 (tcp) is open (unknown)!

    Which ports should be open?
  2. falko

    falko Super Moderator Howtoforge Staff

    I'd open ports 21 (FTP), 22 (SSH), 25 (SMTP), 53 (DNS) (TCP and UDP), 80 (http), 81 (ISPConfig), 110 (POP3), 143 (IMAP), 443 (https), 993 (IMAPs), 995 (POP3s).
    If you want to allow remote connections to MySQL, then you also have to open port 3306.

    What's running on port 48431?
  3. mphayesuk

    mphayesuk Member HowtoForge Supporter

  4. Geoinline

    Geoinline New Member

    That port..

    Each time I do a portscanner I get entries with port values ranging from 30000 to 60000 .. the values change each time I do a port scan... and the number of entries changes as well, 0-3 entries..

    Is that bad? How do I find out what is causing this?
  5. falko

    falko Super Moderator Howtoforge Staff

    As the page says that mphayesuk linked to these ports are used for outbound connections. So if someone is using ftp or http, etc. at the time of the scan then you'll see those ports.

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