Cannot connect to EC2 instance more than once via SSH (OSX Terminal)

Question

Update

This may be to do with my account potentially being in an 'isolated' state as per this post: https://forums.aws.amazon.com/thread.jspa?start=0&threadID=239202&tstart=0

I'm going to contact AWS and ask them if this is the issue.

Original Post

I'm fairly new to AWS but getting a recurring problem with connecting to EC2 via SSH. In short, I seem to be only able to connect once via SSH to my instance - all future attempts time out. The only fix is to stop it and start it each time.

Here is as much detail as I can provide - really hoping you guys can help me out here!

• Video of timeout:

  Timeout Video

• EC2 is a T2 Micro:

  EC2 Specs

• My EC2 is in a custom VPC -My Security Group has Port 22 open to the world and outbound it can access everything:

  • SG - Inbound Rules
  • SG - Oubound Rules

• I'm using a public subnet in my VPC

  • My Network Access Control List (NACL) is default:

    NACL - Inbound Rules

    NACL - Outbound Rules

• Route table has a route out to my Internet Gateway (which works fine):

  My Route Table

• When I connect first time it's fine:

• After a few mins, I can't connect again:

  (see video at top of post)

Notes: - Not that it matters but when I do successfully SSH in, I can curl webpages and get a response - I'm tethering from my phone but doesn't seem to be affecting things (I think this didn't work at home either) - If I just wait a minute or two after first SSH'ing in and exiting, when I try to reconnect after a couple of mins it will just time out

Thanks in advance.

Answer 1

Issue was that AWS had for some reason set an 'isolated' flag in my account (I must have deactivated this a long time ago and it still had that flag on).

FYI I don think you can see this 'isolated' flag anywhere in the UI but if you raise a case with AWS they very quickly checked and removed it.