Política de Privacidade

  Revisão 07/2023 CONDIÇÕES E TERMOS DE SERVIÇO E UTILIZAÇÃO “Intelligence Software” A Intelligence Software provê serviços de desenvolvimento de aplicativos no território brasileiro. Temos a responsabilidade de proteger cada cliente e lhes proporcionar os melhores serviços possíveis. As diretrizes seguintes foram projetadas para assegurar a qualidade de nossos serviços. Tenha certeza de que entendeu e concorda com as políticas, pois a violação dessas políticas poderá resultar em suspensão ou término da sua conta sem direito a reembolso de valores pagos. Você confirma e concorda que a Intelligence Software, a seu absoluto e exclusivo critério, pode alterar ou modificar este Acordo, e quaisquer políticas ou acordos integrados a ele, a qualquer momento, e tais alterações ou modificações entrarão em vigor imediatamente após a publicação neste Site, e seu uso deste Site ou dos Serviços encontrados neste Site após tais alterações ou modificações terem...
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Test if a TCP port is open "Telnet"

To test if a TCP port is open you can use the telnet command or even the newer Netcat, below is an image of a test with telnet on a website:

 

 

 

Notice that the command returned "Connected to ..." this means that a communication was established with the host that responds to www.pudim.com.br on port 80, as it is an http port, I could start a conversation with https protocol commands. Now let's see a failed communication:

 

 

 

Now the port 3389 has been tested but this portal is not open on the destination host and so telnet keeps trying and fails. But on a host with this port open it works normally:



  

See in this last image it worked, as it is about the RDP protocol we could now exchange RDP commands.



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