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Editorial Team
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Asked: 2026-05-26T02:34:49+00:00

This error is from a PC connected to a comcast modem. Is port blocking

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This error is from a PC connected to a comcast modem. Is port blocking an issue when a person is trying to make an outbound TCP channel with a Java URL . . . the relevant code is :

URL u = new URL("mailto:someguy@gmail.com");    // make a mailto: url
URLConnection c = u.openConnection();   // make its urlconnection
c.connect();                // connect to mail host

catch (Exception e) {   // handle any exceptions, print error message
  System.err.println(e);
}

The console returns the message :

connect. Timeout = -1
java.net.UnknownHostException: mailhost

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1 Answer

  1. Editorial Team

    This exception java.net.UnknownHostException: mailhost is thrown to indicate that the IP address of a host could not be determined.

    I reckon you might be trying to send a mail.

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