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Hello.
Are there any differences in the parameters of EC2 started with specifying a region and EC2 started without specifying a region?
For example, are there any differences in the running subnets or security groups?
If there are differences in the subnets, it may be a good idea to check the route table and see if there is a route to the Internet gateway.
When you don't specify a region explicitly, AWS SDKs often default to a region based on the configuration of the AWS environment in which they are running. This configuration might be based on environment variables, AWS CLI settings, or other factors depending on the SDK and environment.
By default, Lambda functions are region-agnostic in their execution. By not specifying the region in your Lambda function code, you allowed the AWS SDK to default to a certain region. However, when you tried to connect to the EC2 instance via a browser, you might have attempted to access it from a different region or from a location outside the AWS network. AWS regions are isolated from each other by design, and resources launched in one region are not directly accessible from another region unless you explicitly set up networking between them.
When you specified the region in your Lambda function code, you ensured that the EC2 instance was launched in the desired region. Consequently, when you attempted to connect to it via a browser, you were likely accessing it from within the same region where it was launched, thus allowing the connection to succeed.
Hard-coding the AMI ID ImageId: 'ami-04b70fa74e45c3917',
implies the region anyway - this AMI is Ubuntu 24.04 in us-east-1 and as such an EC2 instance can only be launched using this AMI in that region. Plus I'm guessing the credentials you're using would have the region set as well anyway.
What are all the differences in your code when you specify a region, compared to when you don't? Is it just one line specifying the region and that's it, or are there more entries specifying any or all of AZ, VPC, subnet, etc.?
Lastly, when you talk of being able to connect to EC2 via a browser, are you trying to use Session Manager or Instance Connect (or something else)?