Why does this setting block JMeter during security compliance load test?

What is the reason this setting causes immediate 403 Forbidden responses when scaling concurrent requests in our JMeter plan?

Running a load test on the Genesys Cloud platform_api to simulate high-volume user authentication and data retrieval. The goal is to validate performance under peak load while adhering to strict security compliance requirements. Using JMeter 5.6.2 with the HTTP Request sampler. The test plan simulates 200 concurrent users hitting the /api/v2/users/me endpoint after successful OAuth2 token acquisition. Initially, requests succeed with 200 OK. However, as concurrency increases beyond 50 users, the API starts returning 403 Forbidden errors with the message “Access denied: rate limit exceeded” even though the documented rate limits for our tier are much higher. The environment is Genesys Cloud US East. We have verified that the access tokens are valid and not expired. The issue seems linked to the IP-based rate limiting mechanism triggered by the load generator’s static IP. Need to understand if there is a specific header or configuration in the JMeter request that can bypass or adjust this security threshold for testing purposes without violating compliance. Current JMeter config uses thread groups with ramp-up time of 10 seconds. Any guidance on adjusting the test parameters or understanding the security policy would be appreciated.

The documentation actually says… to implement exponential backoff for rate limiting instead of raw concurrent bursts.

403s trigger when you exceed the API’s per-second limit. By managing SIP registration churn and adding jitter to your JMeter thread groups, you avoid hitting the carrier-side throttling limits. This aligns with standard failover logic for high-volume reporting queries.