NSX UI Error: Client 'admin' exceeded request rate of 100 per second (Error code: 102)

Products

• VMware NSX
• VMware Aria Operations (formerly vRealize Operations) 8.x

Issue/Introduction

• The NSX UI displays the following error message: "Error: Client 'admin' exceeded request rate of 100 per second (Error code: 102)."
• This error prevents navigation through the UI and the performance of management tasks.
• The NSX UI repeatedly reports that the request has exceeded the API rate limit.

Environment

• VMware NSX 3.x,4.x
• Aria Operations (formerly vROps) 8.x

Cause

The admin account is hitting the default API rate limit of 100 requests per second.
This is typically caused by:

• External monitoring tools (e.g., Aria Operations/vROps) polling the manager too frequently.
• Automation scripts or backup jobs running in the background using the admin credentials.

The NSX Management Plane enforces per-identity API concurrency limits via the HTTP service to prevent resource exhaustion.

Resolution

To resolve this immediately and restore access, apply the following workaround via the NSX Manager CLI (SSH as admin):

• Check the current limit to confirm the configuration: get service http
• Increase the rate limit to provide immediate relief: set service http client-api-rate-limit <value>
• Verify the change: get service http

Additional Information

To identify the source IP address making the excessive requests, run the following command from the NSX Manager as root: 

zgrep -Fh '/api/' /var/log/proxy/envoy_access_log.txt* 2> /dev/null | awk '{print $2}' | sort | uniq -c | sort -rn | head

KB 378126

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