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Java Forum / General / December 2005A strange error with Sockets
Hi, I was having some problems with sockets, so I did some research to what could cause the error. I have found what caused it, but I'm affraid I don't have a single clue of how to solve it. I created a ServerSocket on the first comp, listening to port 5000. No problems occurred, the ServerSocket was succesfully created. Then, I created a Socket on the second comp, who connected to that host on port 5000. Several minutes later, the connection timed out without having made a succesfull connection. All this was done using native Java.net API code, and since that has been tested, the error can't have been caused by the code. What could possibly cause this problem? I did this test on a local network consisting out of a router, a Gentoo computer and a Windows laptop. pieter > I was having some problems with sockets, so I did some research to what > could cause the error. I have found what caused it, but I'm affraid I > don't have a single clue of how to solve it. Get yourself a copy of Ethereal (free at http://www.ethereal.com/) -- you are just wasting your own time if you attempt any kind of network trouble-shooting without it (or an equivalent). -- chris >> I was having some problems with sockets, so I did some research to what >> could cause the error. I have found what caused it, but I'm affraid I [quoted text clipped - 5 lines] > > -- chris Chris is right - Ethereal will tell you exactly what's happening. But two quick questions: Can one computer ping the other? Is either one running a firewall? Steve > I created a ServerSocket on the first comp, listening to port 5000. > No problems occurred, the ServerSocket was succesfully created. [quoted text clipped - 8 lines] > network consisting out of a router, a Gentoo computer and a Windows > laptop. One guess: Your server code did not accept() the connection. Second guess: the second client has DNS or routing issues. Does the connection fail when you specify a hostname, or even when you specify an IP address for the host? Post your server code. Post your routing tables. Try pinging between the hosts using hostnames and using IP addresses. /gordon  Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > Hi, > I was having some problems with sockets, so I did some research to what [quoted text clipped - 15 lines] > > pieter First, rule out a problem with your java code by testing on one system, either the Gentoo or Windows laptop, i.e. start server in one window and client in another on the same system. Second, I'll assume you are using Windows XP, and I have found in you add your "remote" system in your Windoze hosts file, located on %SystemRoot%\system32\drivers\etc, will reduce the connect time, but is not the cause of your connection failure. If your java code works on both systems locally, i.e. server and client running in one system, then insure your router is not blocking the port your are using, and/or your firewall settings on either Windoze or Gentoo allow access to the port 5000. Joseph Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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