Unhealthy Workspaces

There are no known widespread issues with AWS WorkSpaces at the moment, but the situation you're describing is not uncommon. When WorkSpaces show up as "Unhealthy," it can be due to various reasons, and different troubleshooting steps may be required depending on the underlying cause.

Some common reasons for WorkSpaces to become unhealthy include:

1. High CPU utilization
2. Changed computer name
3. Non-running agents or services
4. Blocked network connections
5. Antivirus software interfering with WorkSpaces components

Since rebooting didn't resolve the issue for all affected WorkSpaces, and restoring only worked for some, you may need to investigate further. Here are some steps you can take:

1. Check CloudWatch metrics for CPU usage, memory usage, and the number of unhealthy WorkSpaces to identify any patterns.

2. If possible, try to access the WorkSpaces using SSH (for Linux) or RDP (for Windows) to investigate further.

3. For Windows WorkSpaces, verify the computer name hasn't changed, check firewall rules, and ensure necessary services are running.

4. For Linux WorkSpaces, verify that interfaces and services are running and responsive, and check the Skylight certificate.

5. If you can't access the WorkSpaces through SSH or RDP, you may need to use the AWS Systems Manager AWSSupport-RecoverWorkSpace automation runbook to rebuild the WorkSpaces that are still unhealthy.

Remember that restoring or rebuilding a WorkSpace can potentially result in data loss, as it uses the most recent available snapshot, which can be up to 12 hours old. Always ensure you have the necessary permissions before running any automation or recovery processes.

If the issue persists after trying these steps, it's advisable to contact AWS Support for further assistance, as there might be an underlying problem specific to your environment that requires more in-depth investigation.
Sources
Troubleshoot an unhealthy Linux WorkSpace | AWS re:Post
Troubleshooting a Windows WorkSpace marked as unhealthy - Best Practices for Deploying WorkSpaces
Recover an Amazon Workspace in an unhealthy state | AWS re:Post
AWSSupport-RecoverWorkSpace - AWS Systems Manager Automation runbook reference