If you stopped the EC2 instance, it will no longer be connectable until you start it again.
If your instance is stuck in a stopping state for a long period of time, there could be an issue and you should submit a ticket to have this looked at.
Ec2 Instance ID : i-06d46cd9 stuck in the stopping state.Accepted Answerasked 6 months ago
Failed to force stop instanceasked a year ago
EC2 Instance No Response after Force Stopasked 7 months ago
The instance has not stopped after force to stop by action menu.asked 2 years ago
EC2 Instance stuck in stopping stateasked a year ago
EC2 instance hung in stopping. Does not response on Force Stop eitherasked a year ago
EC2 Instance Stuck in "stopping" stateasked 3 years ago
EC2 Will not Force Stopasked a year ago
Stop or force stop instance does not worksasked a year ago
EC2 instance stuck in Stopping stateasked a year ago