Was able to access my instances from my phone on a different network. All good now! Thanks to AWS support for asking me to try that.
Looks like the error message was due to my network/browser interfering with https://ca-central-1.console.aws.amazon.com/. Something along those lines.
Can you provide some more details about your set-up?
When you say "I am unable to access my EC2 instance", how are you trying to access the EC2 machine? Are you trying to ssh into it? If so, are you going over the internet, because from what you have mentioned, you seemed to have removed the IPSec VPN connection from your corporate network to AWS. If that is correct, can you check if the security groups for the EC2 machine allows SSH traffic from the internet? Earlier, you may have connected from your corporate network's CIDR range and that may have been allowed in the security group.
When you say "I am unable to terminate this", are you trying to terminate the EC2 machine from the AWS console?
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