Amazon EC2 UDP connect failed

Networking and Multiplayer Programming

Started by polyfrag July 02, 2012 01:07 AM

8 comments, last by polyfrag 11 years, 9 months ago

polyfrag

2,504

Author

July 02, 2012 01:07 AM

[color=#000000][font=verdana, arial, sans-serif]

I have an Amazon EC2 (Amazon Linux) server with port 9930 open[/font][color=#000000][font=verdana, arial, sans-serif]

I have a simple test program:[/font][color=#000000][font=verdana, arial, sans-serif]

http://pathogen.myftp.org/test.cpp[/font][color=#000000][font=verdana, arial, sans-serif]

When I run it and try to telnet port 9930 it says[/font][color=#000000][font=verdana, arial, sans-serif]

Could not open connection to host, on port 9930: Connect failed[/font][color=#000000][font=verdana, arial, sans-serif]

Why?[/font]

deftware

1,778

July 02, 2012 02:52 AM

There has been a lot of power outages, and I know that amazon's cloud services have been severely affected.. http://hardware.slashdot.org/story/12/06/30/162250/more-uptime-problems-for-amazon-cloud

ApochPiQ

23,138

July 02, 2012 05:28 AM

You have opened a socket using UDP. Telnet is a TCP-based utility. Basically, you're calling a phone number in China and asking why they aren't speaking French ;-)

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hplus0603

11,916

July 02, 2012 04:44 PM

To test sockets in general, and UDP sockets specifically, use the "netcat" program.

enum Bool { True, False, FileNotFound };

MarkusPfundstein

207

July 02, 2012 08:09 PM

please test if you have UDP ports opened in your 'security group'

I open sourced my C++/iOS OpenGL 2D RPG engine :-)

See my blog: (Tutorials and GameDev)

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polyfrag

2,504

Author

July 02, 2012 11:29 PM

please test if you have UDP ports opened in your 'security group'

Yep, UDP port open.

To test sockets in general, and UDP sockets specifically, use the "netcat" program.

This works:

nc -u

ec2-50-19-202-144.compute-1.amazonaws.com

9930

But my game still doesn't... mmm.

polyfrag

2,504

Author

July 03, 2012 12:38 AM

Even this sample program doesn't work

http://www.tenouk.com/Winsock/Winsock2example9.html

test.exe -p UDP -n ec2-50-19-202-144.compute-1.amazonaws.com -e 9930

polyfrag

2,504

Author

July 03, 2012 12:49 AM

[color=#000000][font=verdana, arial, sans-serif]

Even netcat for windows doesn't work when I do the same command:[/font]

nc.exe -u ec2-50-19-202-144.compute-1.amazonaws.com 9930

http://joncraton.org...cat-for-windows

hplus0603

11,916

July 03, 2012 01:18 AM

What does wireshark say on the machine you run "nc.exe" on?
Are you sure the Amazon provisioning is set up to allow UDP in on the public IP? If it works with netcat on the server, but not with netcat on your client, then that's the most likely problem.
Could also be local firewalls on the client, on your router, or on the server itself.

enum Bool { True, False, FileNotFound };

polyfrag

2,504

Author

July 03, 2012 01:48 AM

[color=#000000][font=verdana, arial, sans-serif]

Amazon EC2 UDP connect failed

I have an Amazon EC2 (Amazon Linux) server with port 9930 open[/font][color=#000000][font=verdana, arial, sans-serif]

I have a simple test program:[/font][color=#000000][font=verdana, arial, sans-serif]

http://pathogen.myftp.org/test.cpp[/font][color=#000000][font=verdana, arial, sans-serif]

When I run it and try to telnet port 9930 it says[/font][color=#000000][font=verdana, arial, sans-serif]

Could not open connection to host, on port 9930: Connect failed[/font][color=#000000][font=verdana, arial, sans-serif]

Why?[/font]

Even netcat for windows doesn't work when I do the same command:[/font]

nc.exe -u ec2-50-19-202-144.compute-1.amazonaws.com 9930

http://joncraton.org...cat-for-windows

OOOooh, I forgot to click Apply Rule for the UDP ports. Works now. Thank you.[/font]

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Amazon EC2 UDP connect failed

I have an Amazon EC2 (Amazon Linux) server with port 9930 open[/font][color=#000000][font=verdana, arial, sans-serif]

I have a simple test program:[/font][color=#000000][font=verdana, arial, sans-serif]

http://pathogen.myftp.org/test.cpp[/font][color=#000000][font=verdana, arial, sans-serif]

When I run it and try to telnet port 9930 it says[/font][color=#000000][font=verdana, arial, sans-serif]

Could not open connection to host, on port 9930: Connect failed[/font][color=#000000][font=verdana, arial, sans-serif]

Why?[/font]

Even netcat for windows doesn't work when I do the same command:[/font] nc.exe -u ec2-50-19-202-144.compute-1.amazonaws.com 9930 http://joncraton.org...cat-for-windows

OOOooh, I forgot to click Apply Rule for the UDP ports. Works now. Thank you.[/font]

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines

Even netcat for windows doesn't work when I do the same command:[/font]

nc.exe -u ec2-50-19-202-144.compute-1.amazonaws.com 9930

http://joncraton.org...cat-for-windows