All sites connected to the vpc are not working.

Based on the information provided, it's difficult to definitively say if there's a problem with your VPC specifically. However, given that all sites connected to the VPC are not working, there could be an issue with the VPC configuration or connectivity. Here are some steps you can take to troubleshoot the problem:

1. Check your VPC's route tables to ensure they are correctly configured to route traffic to the appropriate destinations, including internet gateways or NAT gateways if internet access is required.

2. Verify that the security groups and network ACLs associated with your resources are allowing the necessary inbound and outbound traffic.

3. If you're using VPN connections or VPC peering, ensure these connections are active and properly configured.

4. Check if you can access the VPC management console. If you're experiencing issues with the console itself, it could be due to browser extensions, security firewalls, or authentication token timeouts. Try disabling privacy extensions, adjusting firewall settings, or refreshing your browser.

5. Use AWS CLI to check the status of your VPC and its components if you can't access the console.

6. If possible, use AWS Reachability Analyzer to identify any specific networking components causing connectivity issues.

7. Review any recent changes made to your VPC configuration that might have coincided with the onset of the problem 10 hours ago.

8. Check AWS service health dashboard to see if there are any ongoing AWS issues in your region that might be affecting VPC functionality.

If you're still unable to resolve the issue after these checks, it would be advisable to contact AWS support for further assistance, as they can provide more detailed diagnostics based on your specific account and VPC configuration.
Sources
Troubleshoot a VPC peering connection - Amazon Virtual Private Cloud
Not able to access VPC management console, getting network failure errors | AWS re:Post

Please review above recommendations and include additional info to receive further help. When you say "server seems to be normal" what validations have been made?