TCP Socket connection to a domain name

[Griffyn]

Hi,

Just started learning java. I'm writing an Android app, and want to connect to a TCP server using a domain name, eg. myserver.mydomain.com

The code I'm using is:

Socket connfd = new Socket (InetAddress.getByName("myserver.mydomain.com").getHostAddress(), 3280);

This line causes the app to hang. If I remove the getHostAddress() bit, eg.

Socket connfd = new Socket (InetAddress.getByName("myserver.mydomain.com"), 3280);

Then it will timeout eventually, but never try the connection.

The TCP server app listening at the other end is a Delphi app I wrote with logging, and I can see that it's never receiving the connection request.

Help please?

 

[Diancecht]

What happens if you use the numerical IP?

Cheers,
Dian

 

[Griffyn]

It connects fine with a numerical IP.

 

[Diancecht]

Then my next check would be to print the result of InetAddress.getByName("myserver.mydomain.com").getHostAddress() to test it's resolving correctly.

Cheers,
Dian

 

[Griffyn]

Problem solved. Combination of the eclipse IDE not doing an inline resolve correctly, plus that I'd forgotten to poke a hole in the firewall - oops.