I'm not really sure I understand the problem here, but amazon instances addresses do and will change - every time you reboot the instances or every time an instance gets replaced in an auto-scaling group. Are your instances rebooting? If so, you could just be trace routing to an IP address that's no longer attached to anything...

Have you considered using EIPs (Elastic IPs) on your instances, which will effectively give them a static IP address?

Paul

Sent from my iPhone. Please excuse brevity, spelling and punctuation.

On 7 Jul 2013, at 10:36, "Ian" <ian@lovingboth.com> wrote:

I said..

OK, the next time it doesn't work, I will try the ones that have worked
in the past and see if they still are.

The AWS-hosted service is not working for me at the moment if I do a traceroute from the server to two addresses I know have been used, I get this:

traceroute to 54.224.171.85 (54.224.171.85), 30 hops max, 60 byte packets
1  obstler.bitfolk.com (85.119.80.8)  0.113 ms  0.103 ms  0.089 ms
2  jump-gw-4.lon.bitfolk.com (85.119.80.4)  0.408 ms  0.511 ms  0.638 ms
3  * * *
4  xe-6-0-3.r22.londen03.uk.bb.gin.ntt.net (129.250.6.52)  0.560 ms 0.554 ms  0.536 ms
5  ae-4.r22.nycmny01.us.bb.gin.ntt.net (129.250.3.126)  79.069 ms 70.485 ms  78.792 ms
6  ae-0.r23.nycmny01.us.bb.gin.ntt.net (129.250.3.73)  82.304 ms 78.405 ms  78.850 ms
7  ae-5.r20.asbnva02.us.bb.gin.ntt.net (129.250.2.183)  76.464 ms 86.242 ms  76.499 ms
8  ae-1.r04.asbnva02.us.bb.gin.ntt.net (129.250.3.17)  75.842 ms 78.450 ms  74.581 ms
9  ae-5.amazon.asbnva02.us.bb.gin.ntt.net (168.143.232.74)  123.036 ms  77.411 ms ae-4.amazon.asbnva02.us.bb.gin.ntt.net (168.143.232.50) 74.463 ms
10  72.21.220.45 (72.21.220.45)  79.393 ms 72.21.220.37 (72.21.220.37) 85.883 ms 72.21.220.61 (72.21.220.61)  86.360 ms
11  72.21.222.149 (72.21.222.149)  103.169 ms  85.841 ms 205.251.245.65 (205.251.245.65)  85.791 ms
12  * * *
13  * * *
14  * * *
15  216.182.224.81 (216.182.224.81)  79.537 ms 216.182.224.27 (216.182.224.27)  75.167 ms 216.182.224.25 (216.182.224.25)  79.071 ms
16  * * *
..
30  * * *


traceroute to 50.16.139.168 (50.16.139.168), 30 hops max, 60 byte packets
1  obstler.bitfolk.com (85.119.80.8)  0.082 ms  0.057 ms  0.043 ms
2  jump-gw-4.lon.bitfolk.com (85.119.80.4)  0.482 ms  0.470 ms  0.577 ms
3  * * *
4  xe-6-0-3.r22.londen03.uk.bb.gin.ntt.net (129.250.6.52)  0.520 ms 0.506 ms  0.495 ms
5  ae-4.r22.nycmny01.us.bb.gin.ntt.net (129.250.3.126)  72.303 ms 69.084 ms  70.409 ms
6  ae-0.r23.nycmny01.us.bb.gin.ntt.net (129.250.3.73)  69.746 ms 70.370 ms  75.362 ms
7  ae-5.r20.asbnva02.us.bb.gin.ntt.net (129.250.2.183)  77.942 ms 78.535 ms  89.859 ms
8  ae-1.r04.asbnva02.us.bb.gin.ntt.net (129.250.3.17)  85.620 ms 75.852 ms  75.955 ms
9  ae-4.amazon.asbnva02.us.bb.gin.ntt.net (168.143.232.50)  78.942 ms ae-2.amazon.asbnva02.us.bb.gin.ntt.net (168.143.228.38)  76.686 ms 80.720 ms
10  72.21.220.29 (72.21.220.29)  85.432 ms 72.21.220.61 (72.21.220.61) 85.848 ms 72.21.220.69 (72.21.220.69)  86.161 ms
11  205.251.245.65 (205.251.245.65)  81.914 ms 72.21.222.149 (72.21.222.149)  84.430 ms  88.348 ms
12  * * *
13  * * *
14  * * *
15  216.182.224.77 (216.182.224.77)  85.632 ms 216.182.224.243 (216.182.224.243)  96.197 ms 216.182.224.121 (216.182.224.121)  85.606 ms
16  * * *
...
30  * * *

.. and I get much the same result from home:

ian@core2 ~ $ traceroute 54.224.171.85
traceroute to 54.224.171.85 (54.224.171.85), 30 hops max, 60 byte packets
...
6  * tele-ic-4-ae0-0.network.virginmedia.net (62.253.174.18)  76.585 ms  76.599 ms
7  equinix01-iad2.amazon.com (206.126.236.68)  110.352 ms  119.683 ms *
8  72.21.220.53 (72.21.220.53)  128.953 ms  132.245 ms  144.806 ms
9  72.21.222.149 (72.21.222.149)  144.837 ms 205.251.245.65 (205.251.245.65)  162.165 ms  162.195 ms
10  * * *
11  * * *
12  * * *
13  216.182.224.211 (216.182.224.211)  105.777 ms 216.182.224.209 (216.182.224.209)  100.980 ms  114.747 ms
14  * * *
...
30  * * *

Hmm, set up a WP site at home and see if it is seen by the service?

 Ian

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