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I have two EC2 instances running Windows. They are both in the same security group which allows for all outgoing ports, but only RDP ports from my IP. What I can't figure out is that both, to my examination, have the same security and networking settings, but one connects through RDP but the other one doesn't.

Any suggestions for settings to look at?

Lacrosse343
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  • **Side-note:** Multiple instances are not "in the same security group". Security Groups apply their rules individually on each resource. Therefore, Security Groups can _apply_ to multiple instances, but the instances are not "in" the same group. The Security Group would still need rules that allow the Group to talk to itself. – John Rotenstein Aug 24 '22 at 01:27
  • Thanks for the clarification. That is an important detail. – Lacrosse343 Aug 24 '22 at 12:36

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After a few attempts of download the .rdp file, checking the inbound rules, running nslookup myip.opendns.com resolver1.opendns.com to see my IP just to make sure I wasn't going crazy.

Ultimately what solved the problem was restarting my own computer and running the .rdp file. Not sure why, but maybe my computer was sending stale configuration data.

Lacrosse343
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