I've never had trouble with this until I started using hotspot Wi-Fi instead of my normal Wi-Fi.
I always get connection closed by xx.xxx.xxx.xx when trying to SSH into my Amazon instance:
jeff@jeff-Inspiron-5749:~$ ssh -v -i /path/to/key.pem ubuntu@9.99.999.99
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/jeff/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 9.99.999.99 [9.99.999.99] port 22.
debug1: Connection established.
debug1: identity file /path/to/key.pem type -1
debug1: identity file /path/to/key.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13 pat OpenSSH_6.6.1* compat 0x04000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by 9.99.999.99
EDIT:
I've also tried changing the inbound security rules of my EC2 to accept all ip address: 0.0.0.0/0 and this will sometimes work, but only occasionally. I suspect it may be a connection/speed issue with my hotspot Wi-Fi? But I can stream videos on YouTube just fine...
I've currently whitelisted my hotspot ip address by selecting "use my ip" on Amazon.
EDIT 2:
I switched back to normal wifi just so I could log into my EC2 and look at the /var/log/auth.log file, and this is what I found:
AUG 20 08:05:01: session opened for user root by (uid=0)
AUG 20 08:05:01: session closed for user root
in many lines... always with the same times. an open and and immediate close.
Traceroute info:
traceroute with normal wifi:
jeff@jeff-Inspiron-5749:~$ traceroute 3.15.182.213
traceroute to 3.15.182.213 (3.15.182.213), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 0.957 ms 1.382 ms 1.380 ms
2 * * *
3 173-219-251-70.suddenlink.net (173.219.251.70) 28.725 ms 28.740 ms 29.351 ms
4 173-219-243-78.suddenlink.net (173.219.243.78) 32.849 ms 33.736 ms 40.397 ms
5 173-219-251-42.suddenlink.net (173.219.251.42) 40.376 ms 40.385 ms 43.927 ms
6 sjo-b21-link.telia.net (213.248.71.92) 43.931 ms 27.817 ms 27.746 ms
7 kanc-b1-link.telia.net (213.155.132.181) 56.957 ms 62.528 ms 62.489 ms
8 chi-b22-link.telia.net (62.115.121.231) 74.532 ms 79.607 ms 79.564 ms
9 a100-ic-320469-chi-b22.c.telia.net (213.248.76.189) 85.049 ms 85.025 ms 90.579 ms
10 52.95.63.36 (52.95.63.36) 93.491 ms 52.95.63.100 (52.95.63.100) 90.982 ms 52.95.63.84 (52.95.63.84) 69.568 ms
11 52.95.63.129 (52.95.63.129) 69.504 ms 52.95.63.81 (52.95.63.81) 67.446 ms 52.95.63.93 (52.95.63.93) 66.798 ms
12 * * *
13 54.239.43.213 (54.239.43.213) 101.916 ms 54.239.43.221 (54.239.43.221) 101.347 ms 54.239.43.213 (54.239.43.213) 93.177 ms
14 * * *
15 52.95.3.38 (52.95.3.38) 92.952 ms 52.95.2.150 (52.95.2.150) 96.277 ms 52.95.2.232 (52.95.2.232) 84.388 ms
16 52.95.2.219 (52.95.2.219) 87.294 ms 52.95.2.137 (52.95.2.137) 88.427 ms 52.95.2.163 (52.95.2.163) 88.596 ms
17 52.95.2.164 (52.95.2.164) 87.236 ms 52.95.2.106 (52.95.2.106) 95.621 ms 52.95.2.252 (52.95.2.252) 99.941 ms
18 52.95.2.171 (52.95.2.171) 85.164 ms 52.95.2.199 (52.95.2.199) 85.299 ms 52.95.2.87 (52.95.2.87) 95.134 ms
19 52.95.1.6 (52.95.1.6) 91.705 ms 91.658 ms 52.95.3.132 (52.95.3.132) 88.059 ms
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
jeff@jeff-Inspiron-5749:~$
traceroute with hotSpot wifi:
jeff@jeff-Inspiron-5749:~$ traceroute 3.15.182.213
traceroute to 3.15.182.213 (3.15.182.213), 30 hops max, 60 byte packets
1 192.168.43.1 (192.168.43.1) 104.447 ms 104.446 ms 104.443 ms
2 249.sub-66-174-31.myvzw.com (66.174.31.249) 168.149 ms 177.345 ms 177.575 ms
3 * * *
4 * * *
5 * * *
6 171.sub-69-83-164.myvzw.com (69.83.164.171) 177.511 ms 33.417 ms 33.247 ms
7 3.sub-69-83-164.myvzw.com (69.83.164.3) 33.845 ms 126.625 ms 126.604 ms
8 232.sub-69-83-160.myvzw.com (69.83.160.232) 126.600 ms 126.577 ms 126.553 ms
9 122.sub-69-82-83.myvzw.com (69.82.83.122) 126.556 ms 126.551 ms 44.159 ms
10 137.sub-66-174-29.myvzw.com (66.174.29.137) 50.315 ms 50.333 ms 50.723 ms
11 209.116.153.13 (209.116.153.13) 51.129 ms 51.102 ms 51.109 ms
12 207.88.14.197.ptr.us.xo.net (207.88.14.197) 74.258 ms 77.847 ms 77.731 ms
13 52.95.217.244 (52.95.217.244) 77.306 ms 52.95.217.130 (52.95.217.130) 77.072 ms 76.966 ms
14 176.32.125.212 (176.32.125.212) 77.031 ms 176.32.125.164 (176.32.125.164) 74.228 ms 176.32.125.152 (176.32.125.152) 74.386 ms
15 176.32.125.157 (176.32.125.157) 79.744 ms 176.32.125.181 (176.32.125.181) 79.703 ms 176.32.125.203 (176.32.125.203) 79.466 ms
16 * * *
17 52.93.129.119 (52.93.129.119) 106.968 ms 52.93.129.109 (52.93.129.109) 109.956 ms 52.93.129.119 (52.93.129.119) 109.554 ms
18 * * *
19 52.95.2.148 (52.95.2.148) 112.365 ms 52.95.2.30 (52.95.2.30) 104.080 ms 52.95.2.148 (52.95.2.148) 108.191 ms
20 52.95.2.163 (52.95.2.163) 113.684 ms 52.95.2.195 (52.95.2.195) 104.267 ms 52.95.2.111 (52.95.2.111) 102.228 ms
21 52.95.2.168 (52.95.2.168) 104.889 ms 52.95.2.190 (52.95.2.190) 110.505 ms 52.95.2.164 (52.95.2.164) 107.502 ms
22 52.95.3.27 (52.95.3.27) 119.008 ms 52.95.2.199 (52.95.2.199) 112.348 ms 52.95.2.255 (52.95.2.255) 106.043 ms
23 52.95.3.132 (52.95.3.132) 109.461 ms 110.252 ms 52.95.1.2 (52.95.1.2) 109.603 ms
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
jeff@jeff-Inspiron-5749:~$
