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I created a AWS EC2 Free Tier Windows instance. At first, I could connect from my Mac Laptop using Microsoft Remote Desktop. I had used the suggested security zone from the Wizard, with the choice of "My IP".

Then, I tried to connect from my iPad on the same home network. No luck. Said the account password was incorrect (it wasn't). So, I tried changing the security zone to "Anywhere".

Bottom line is that now I cannot connect from either my laptop or my iPad. I can change the security zone to "My IP" or "Anywhere" but neither works. Maybe I should just trash this instance and start over?

msarrel
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1 Answers1

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EC2 instances gets a public ip address (if you have requested during launch) automatically. But the auto assigned public ip address will change when the instance stopped and started again. if you don't want the public ip address to change, you need to assign an elastic ip address to your instance.

I have answered this question for another user.

Reference: (Read the answer Arun K) Why I can't access via SSH to my AWS Instance after rebooting?

Arun Kamalanathan
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    Rebooting Amazon EC2 instances does _not_ change the associated public IP address. This is because the same virtual machine continues to run — it is merely the Operating System that has done a reboot. However, if an instance is **Stopped**, then the public IP address can change. – John Rotenstein Dec 08 '19 at 06:03
  • thanks , updated my answer. I actually knew this, It just didn't come to my mind. i used to stop and start instances (instead of rebooting) in order facilitate moving the instance to a new hardware (when requested by aws). – Arun Kamalanathan Dec 08 '19 at 06:11
  • My instance is currently running. I checked the current public IP address as described in the reference. But, I still cannot connect. Ping fails. – msarrel Dec 09 '19 at 03:32
  • for the ping to work, you need allow `ICMP` traffic in your security group. https://stackoverflow.com/questions/21981796/cannot-ping-aws-ec2-instance – Arun Kamalanathan Dec 09 '19 at 03:32
  • Add a rule to the security group as mentioned in the stackover flow reference above. – Arun Kamalanathan Dec 09 '19 at 03:36