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I had the same problem. I fixed it by creating an S3 VPCEndpoint, like this in CloudFormation:
S3VpcEndpoint:
# We need this VPCE type=Gateway so App Runner can reach S3.
# I'm surprised I need this, as I thought App Runner didn't operate in my VPC
Type: AWS::EC2::VPCEndpoint
Properties:
RouteTableIds:
- !Ref PublicRouteTable
ServiceName: !Sub "com.amazonaws.${AWS::Region}.s3"
VpcId: !Ref VPC
answered 5 months ago
0
Hi,
Because of the timeout error, I'd recommend you to check the Security Groups attached to your App Runner instances if it authorizes outbound connections with HTTP/HTTPS ports.
Thanks
answered 2 years ago
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That was in addition to IAM policies that allowed access; again, from my CloudFormation