Unable to ping/ssh/telnet new EC2 linux instance

Question

I just created a new EC2 instance. Once the instance is running and has passed health checks, I try to connect to its IP via telnet on port 22 (because SSH wasn't working I'm going to basics).

I have:

opened security group's ports 22 and 80
create custom security group's ICMP rule for protocol echo reply
checked AWS statuses for outages -> none

The telnet line is:

telnet [PUBLIC IP ADDRESS] 22 => Connect failed

also tried

telnet [PUBLIC IP ADDRESS] 80 => Connect failed

I did the same for another existing instance and it works. What else can I still check for?

Depending on the distro, make sure that the firewall of the actual instance isn't blocking anything. — Belmin Fernandez, Jun 02 '15 at 23:34
@BelminFernandez but here it seems to be blocking everything.. — greener, Jun 02 '15 at 23:40
@BelminFernandez but it's a *new* instance... Not possible to check notables when you can't access the new instance. — Michael - sqlbot, Jun 03 '15 at 03:06
@greener does the telnet connection say "connection timed out" or "connection refused"? Is this your own AMI or a distro? — Michael - sqlbot, Jun 03 '15 at 03:07
I believe I am correct in asserting that cross-posting is discouraged. http://superuser.com/questions/922998/unable-to-connect-telnet-new-ec2-instance — Michael - sqlbot, Jun 03 '15 at 03:23
@Michael Ah, totally modes that this was initial connection. — Belmin Fernandez, Jun 03 '15 at 03:27
Could you please show us your inbound & outbound rules on your security group that is associated with the instance? — Bazze, Jun 03 '15 at 06:17

score 3 · Answer 1 · answered Jun 03 '15 at 06:42

It turns out the bit of documentation that helped was this:

[EC2-VPC] Check the route table for the subnet. You need a route that sends all traffic destined outside the VPC (0.0.0.0/0) to the Internet gateway for the VPC.

EC2 TroubleshootingInstancesConnecting

I added the route and was able to SSH into the instance.

Unable to ping/ssh/telnet new EC2 linux instance

1 Answers1