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I am unable to ping an IP address on a Amazon EC2 instance. When I do it from a Mac or Linux machine, it works just fine. But, on Windows 7 it doesn't work.

I've tried turning off the firewall, but that doesn't seem to work either. Pinging any other site like www.google.com or Mac.com works fine.

Any ideas?

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1  
When you try to ping, does it timeout? –  uSlackr Oct 27 '11 at 20:28
    
yes it times out –  maximus Oct 27 '11 at 20:44
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Is the IP sensitive, can you give it to us to try? –  Paul Oct 27 '11 at 20:50
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what happens when you do a tracert on the IP? –  Garrett Oct 27 '11 at 20:55
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Have you tried to use the "tracert" to trace the route to see where it's exactly timing out? –  Joe Oct 27 '11 at 22:12

1 Answer 1

up vote 4 down vote accepted

That seems odd, ICMP is disabled by default on the firewall to your ec2 instance. Try running this command on your ec2 instance's firewall security group:

ec2-authorize default -P icmp -t -1:-1 -s 0.0.0.0/0

See the EC2 FAQ Article regarding ICMP.

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Also, I was using some kind of "internal" up address, as opposed to an external ip address. I don't understand why it wasn't an issue on the posix machines. –  maximus Oct 27 '11 at 22:32
    
Thanks for the response! –  maximus Oct 27 '11 at 22:34
    
@maximus you're most welcome –  John T Oct 28 '11 at 15:52

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