No Healthy Upstream Issue in vCenter Overview The "No Healthy Upstream" error in VMware vCenter can occur when the vCenter server is unable to communicate with its upstream services. This issue can lead to disruptions in service and affect the overall performance of your virtual environment.

Symptoms Unable to access vCenter Server UI Errors in logs indicating upstream communication failures Virtual machines may become unresponsive Root Causes The issue may arise from several factors, including but not limited to:

Network connectivity problems Misconfigured settings Resource constraints on the vCenter server Solution To resolve the "No Healthy Upstream" issue, follow these steps:

Check Network Connectivity: Ensure that the vCenter server can communicate with all necessary upstream services. Verify DNS settings and firewall rules.

Review Logs: Examine vCenter logs for detailed error messages that can provide insights into the issue.

**Resource Allocation: **Check the CPU and memory allocation for the vCenter server. Increase resources if necessary.

**Configuration Review: **Review and correct any misconfigured settings in vCenter or related services.

**Apply Patches: **Ensure that your vCenter server is updated with the latest patches from VMware, as they often contain fixes for known issues.

References For further details and a step-by-step guide on implementing the solution, please refer to [this link to your solution documentation].

With gratitude, I appreciate your support. PEIMAN SATTARI