Problem with VPN after enabling FIREWALL

m using a pptp client on windows-xp through an ISP & my VPN server is a linux 4.0.
Recently my ISP enabled some firewall features & now error :619 is returning after verifying user name & password.
can any one say what ports in the firewall to be open Or what other problem is there?
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More about problem enabling firewall
  1. Open port 1723
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