TcpClient and SocketException

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Julien
    #1

    TcpClient and SocketException

    Hi,

    I am developing a C# application to send requests to mail server to check
    email addresses validity. I use a TcpClient object to connect to it with the
    Connect(String hostname, Int32 port) method.
    When I use my application at home I don't have any problem to connect and
    get responses but when I try at work, I get the SocketException number 10061
    : "target machine actively refused it". I don't have any proxy, maybe a
    firewall.

    My question is to know if there is another way to connect the servers (same
    problem with sockets) or if there are existing parameters of the TcpClient
    object to connect thru a firewall...

    Thanks
    Tags: None
    • Bela Istok
      #2
      Re: TcpClient and SocketException

      Hello Julien, As far I know, there is no way to do this, you need to open
      the port in the firewall to do the connection.

      Regards,

      Bela Istok
      "Julien" <Julien@discuss ions.microsoft. comwrote in message
      news:CC8344BA-DC6B-453F-91E4-D78641E623E8@mi crosoft.com...
      Hi,
      >
      I am developing a C# application to send requests to mail server to check
      email addresses validity. I use a TcpClient object to connect to it with
      the
      Connect(String hostname, Int32 port) method.
      When I use my application at home I don't have any problem to connect and
      get responses but when I try at work, I get the SocketException number
      10061
      : "target machine actively refused it". I don't have any proxy, maybe a
      firewall.
      >
      My question is to know if there is another way to connect the servers
      (same
      problem with sockets) or if there are existing parameters of the TcpClient
      object to connect thru a firewall...
      >
      Thanks

        Comment

        • Hadi Hariri
          #3
          Re: TcpClient and SocketException

          Julien

          Sounds like you are not permitted to make a connection on the SMTP port
          (normally 25) due to firewall restrictions.



          --
          http://www.hadihariri.com

          http://www.malagadnug.org

            Comment

            • Julien
              #4
              Re: TcpClient and SocketException

              It's what I was thinking :\

              Just another point, when I use email verifier softwares from this network,
              it is working. So it could possible to do it !?


              "Hadi Hariri" wrote:
              Julien
              >
              Sounds like you are not permitted to make a connection on the SMTP port
              (normally 25) due to firewall restrictions.
              >
              >
              >
              --
              http://www.hadihariri.com

              http://www.malagadnug.org

              >

                Comment

                • Hadi Hariri
                  #5
                  Re: TcpClient and SocketException

                  Julien wrote:
                  It's what I was thinking :\
                  >
                  Just another point, when I use email verifier softwares from this
                  network, it is working. So it could possible to do it !?
                  >
                  >
                  How does th email verifier work?

                  --
                  http://www.hadihariri.com

                  http://www.malagadnug.org

                    Comment

                    • Julien
                      #6
                      Re: TcpClient and SocketException

                      I don't know but it should connect on the remote smtp server !?


                      "Hadi Hariri" wrote:
                      Julien wrote:
                      >
                      It's what I was thinking :\

                      Just another point, when I use email verifier softwares from this
                      network, it is working. So it could possible to do it !?
                      >
                      How does th email verifier work?
                      >
                      --
                      http://www.hadihariri.com

                      http://www.malagadnug.org

                      >

                        Comment

                        • Hadi Hariri
                          #7
                          Re: TcpClient and SocketException

                          Well what do you define by verified by email? Normally to allow
                          relaying (not really connection), they either use authentication or POP
                          before SMTP. You need to know what it's doing to be able to simulate it.


                          --
                          http://www.hadihariri.com

                          http://www.malagadnug.org

                            Comment

                            Previous template Next
                            Working...