Java Server Client Program I/O Exception

A:

I turned off Nortons FireWall and everything and still doesn't work, whats wrong! :/

Maybe Windows Firewall? But nope I checked that and its off too.

AjayP 2010-04-11 23:07:17

A:

How do you have access to the internet? Maybe you have to configure your ADSL modem or your router/switch to forward the port 4444 to your computer.

Juliano 2010-04-11 23:15:38

I stated in my first post that I already forwarded, and used a port open checker. So I'm guessing I'm past this correct?

AjayP 2010-04-11 23:20:10

If the port open checker returns "Open", isn´t your program working? I think if it was not working, the port wouldn´t be open. What´s the exception message?

Juliano 2010-04-11 23:47:59

IO Exception is all I know about it. The client cant read what the server is saying.

AjayP 2010-04-12 00:24:31

Try to catch the Exception and print the message: try {...} catch(Exception e) { System.out.println(e.Message); }

Juliano 2010-04-12 01:05:05

It says "connnection refused: connect"

AjayP 2010-04-12 01:13:55

When you execute "telnet xx.xx.xx.xx 4444" in the command line, does it connect?

Juliano 2010-04-12 02:14:26

No it doesnt connect even if the server is on

AjayP 2010-04-12 03:11:38

Please look at the server code in the link provided and make sure it is something that would work with Telnet

AjayP 2010-04-12 03:12:32

This should work. Is the message only "connection refused". Is there any error code like 10061, 10060 (if it's Windows)?

Juliano 2010-04-12 12:44:55

I ran the same program in V C# its the 10061 or w/e code, but strange thing is even with the port being open its not working on the internet.

AjayP 2010-04-12 15:45:37

I think you need to specify the bin address in the ServerSocket object. Look at http://java.sun.com/j2se/1.4.2/docs/api/java/net/ServerSocket.html#ServerSocket(int, int, java.net.InetAddress)

Juliano 2010-04-12 16:44:05

A:

I guess you are in the LAN if you are using a router connecting to your modem. And your computer connect to the router.

Try to connect to your modem which has your internet IP.

sza 2010-04-11 23:16:09

Thanks that would probably work but I would like to keep the solution while still staying behind the router.Is this possible?PS: NetGear Wireless-N

AjayP 2010-04-11 23:18:54

A:

Have you checked that the client is connecting to port 4444 and your public IP? This is another common mistake most people make. If your port is open as you say above and the firewall is off, then there's nothing stopping you connecting.

Helen Neely 2010-04-11 23:18:13

Oh sorry!! Let me update my first post THE PORT IS OPEN I'm getting a IOExcept not UnknownHostHere is my client code:kkSocket = new Socket("70.137.xxx.xx", 4444); this is 100% correct and the port is open but I recieve an IO exception so the client cant read anything.

AjayP 2010-04-11 23:24:23

A:

Use Wireshark or WinDump to snoop the initial TCP handshake. Filter for packets with port 4444. Verify that the opening SYN packet is leaving your computer, that the opening SYN packet is returning to your computer, and to see what whether/how computer is responding to the opening SYN packet.

Note: if you experiment with these tools, you won't be able to use it trace if you use the localhost (127.0.0.1) and your PC IP (10.0.0.12) addresses - in these cases, the packets don't actually leave the computer and can't be snooped. Put the client and server on separate computers if you want to snoop packets on the LAN without involving the gateway.

Bert F 2010-04-12 00:58:36

Good idea I'll try it and post results, will choose best answer if this helps works out.

AjayP 2010-04-12 01:03:14

A:

it said 4444 was CLOSED.

What element said that? Java? netstat? Router configuration?

What did it really say? How? Exception? Stack trace? Message?

EJP 2010-04-12 08:59:08

I said what said its closed, it wasnt java. I used a open port tool on the web canyouseeme.org to check if the port was open, it was closed then I opened it but it's still not working so it must be a problem with my code.

AjayP 2010-04-12 15:47:19

That site doesn't say that ports are closed. Hence the confusion. It might say they are unreachable, or not listening, or connection timed out.

EJP 2010-04-13 07:25:50

ansaurus

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Java Server Client Program I/O Exception

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