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It sounds like a simple connectivity or DNS resolution issue on your client machine. A connectivity issue could also be the cause for your business websites not to respond normally or at all, even if the sites might actually be working normally. They would just be unreachable from your network.
If you open CloudShell in one of the other regions that are working normally for you and try listing the EC2 instances in Singapore, for example, with the command: aws ec2 describe-instances --region ap-southeast-1, I suppose that responds quickly and with the expected data?
If so, you can work around the issue by launching a temporary EC2 instance in one of the working regions, connecting to it, and running your web browser there to access the console and to verify the health of your business websites.
Regarding the issue with your connection, if you're using IPv6, you might want to try disabling it temporarily. IPv6 routing has a reputation of failing occasionally between ISPs still getting used to it, while IPv4 routing is stable.
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Hi there,
I have also the exact same problem. I am in the middle east region and trying to access any of the aws services in singapore are not working. The console loads but then all ap-suotheast-1 services fail to fetch. Tried with the aws cli and it works for other regions, but not for this particular one. There is no other network issue and i have a very stable good internet connection. I am unable to monitor anything in that region for whole week now and cannot do anything as nothing is accessible through the console or cli for this region.