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  1. #1
    Join Date
    Apr 2008
    Posts
    169

    How to Check if this Port is Blocked or Open

    Hello,

    I want to check if certain port is open and not blocked by my ISP how can I do that ?? let's say I want to check if PPTP VPN port is open what software show me these info

    can you suggest something ??
    thanks

  2. #2
    Join Date
    Jul 2005
    Location
    New Jersey, US
    Posts
    1,455
    Do you mean on your server or your own computer?

    You can do a telnet test or get a program that checks the ports that are open.
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  3. #3
    Join Date
    Apr 2008
    Posts
    169
    Quote Originally Posted by ServerManagement View Post
    Do you mean on your server or your own computer?

    You can do a telnet test or get a program that checks the ports that are open.
    I meant on my own computer , I want to know if my ISP block the PPTP VPN port for example

  4. #4
    Join Date
    Apr 2003
    Location
    NC
    Posts
    3,078
    Easiest way is to try and telnet to a pptp vpn and see if the connection is allowed to make it as far as the vpn server.

    If you are doing vpn in particular make sure your router is also not blocking it and has a vpn pass through mode. Generally it is enabled by default but not always.
    John W, CISSP, C|EH
    MS Information Security and Assurance
    ITEagleEye.com - Server Administration and Security
    Yawig.com - Managed VPS and Dedicated Servers with VIP Service

  5. #5
    Join Date
    Apr 2008
    Posts
    169
    thank you guys
    I found this site for checking live ports looks very good tool
    http://www.yougetsignal.com/tools/open-ports/

  6. #6
    Join Date
    Apr 2003
    Location
    NC
    Posts
    3,078
    That is for inbound port checking, not outbound. That will just see if your ISP blocks it going into your computer, not out.
    John W, CISSP, C|EH
    MS Information Security and Assurance
    ITEagleEye.com - Server Administration and Security
    Yawig.com - Managed VPS and Dedicated Servers with VIP Service

  7. #7
    Join Date
    Apr 2008
    Posts
    169
    Quote Originally Posted by eth00 View Post
    That is for inbound port checking, not outbound. That will just see if your ISP blocks it going into your computer, not out.
    yes you are right my mistake
    I will try your telnet method

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