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polyfrag

Amazon EC2 UDP connect failed

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polyfrag    2504
[color=#000000][font=verdana, arial, sans-serif][size=3]I have an Amazon EC2 (Amazon Linux) server with port 9930 open[/size][/font][/color][color=#000000][font=verdana, arial, sans-serif][size=3]
I have a simple test program:[/size][/font][/color][color=#000000][font=verdana, arial, sans-serif][size=3]
[url="http://pathogen.myftp.org/test.cpp"]http://pathogen.myftp.org/test.cpp[/url][/size][/font][/color][color=#000000][font=verdana, arial, sans-serif][size=3]
When I run it and try to telnet port 9930 it says[/size][/font][/color][color=#000000][font=verdana, arial, sans-serif][size=3]
Could not open connection to host, on port 9930: Connect failed[/size][/font][/color][color=#000000][font=verdana, arial, sans-serif][size=3]
Why?[/size][/font][/color]

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deftware    1778
There has been a lot of power outages, and I know that amazon's cloud services have been severely affected.. [url="http://hardware.slashdot.org/story/12/06/30/162250/more-uptime-problems-for-amazon-cloud"]http://hardware.slashdot.org/story/12/06/30/162250/more-uptime-problems-for-amazon-cloud[/url]

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polyfrag    2504
[quote name='FlyingDutchman' timestamp='1341259770' post='4955025']
please test if you have UDP ports opened in your 'security group'
[/quote]
Yep, UDP port open.


[quote name='hplus0603' timestamp='1341247478' post='4954957']
To test sockets in general, and UDP sockets specifically, use the "netcat" program.
[/quote]

This works:

nc -u [left]ec2-50-19-202-144.compute-1.amazonaws.com [/left]9930

But my game still doesn't... mmm. Edited by polyfrag

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polyfrag    2504
Even this sample program doesn't work

[url="http://www.tenouk.com/Winsock/Winsock2example9.html"]http://www.tenouk.com/Winsock/Winsock2example9.html[/url]

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

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polyfrag    2504
[color=#000000][font=verdana, arial, sans-serif][size=3]Even netcat for windows doesn't work when I do the same command:[/size][/font][/color]

[i]nc.exe -u ec2-50-19-202-144.compute-1.amazonaws.com 9930[/i]

[url="http://joncraton.org/blog/46/netcat-for-windows"]http://joncraton.org...cat-for-windows[/url] Edited by polyfrag

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hplus0603    11356
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.

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