Remove Web Application Proxy Server From Cluster File

I waited ten minutes. Then twenty.

That's when I saw it. For the last 72 hours, wap-03 had been silently receiving packets from an old, forgotten monitoring script on a decommissioned jump box. Every five seconds, the script sent a malformed health check: GET / HTTP/1.1\r\nHost: \x00\x00 . wap-03 was spending 30% of its CPU trying to parse null bytes.

She paused. "The WAP server?"

And always, always check your health checks. remove web application proxy server from cluster

Or rather, two of the WAPs did the heavy lifting. The third one, wap-03.internal.stratus.com , was the problem child.

But I knew the truth. wap-03 wasn't providing redundancy; it was providing uncertainty . Its TLS cipher suite was outdated (TLS 1.0, a compliance nightmare). Its network card had a known memory leak. And worst of all, the session persistence table would occasionally corrupt, silently dropping 0.5% of payment authorization requests.

At 2:17 AM, I drained the traffic. The F5 showed wap-03 's connection count dropping from 1,200 to 0. Beautiful. I waited ten minutes

The remaining two WAPs ( wap-01 and wap-02 ) recalculated their session tables. CPU usage on wap-01 jumped from 18% to 32%. Well within limits. Memory stable. Error rate on the payment API… held steady at 0.01% (baseline noise).

Tonight was the night. I had a change ticket: CHG-0421 – Remove wap-03 from cluster and decommission.

I ran the stop command: Stop-WebApplicationProxy -Node wap-03 For the last 72 hours, wap-03 had been

For six months, wap-03 had been a source of low-grade anxiety. Every Tuesday at 4:00 PM, latency on that node would spike by 200ms. The logs showed a cryptic error: Event ID 1309 – Connection dropped by backend . Management refused to let me take it offline. "It's redundant," my boss, Linda, had said. "Redundancy means we keep it."

"Yes. Also, we have a rogue monitoring script you should know about."

Instantly, the average response time for the payment API dropped from 340ms to 190ms. A 44% improvement. The error rate fell to 0.001%.

I pulled the plug on wap-03 at 2:53 AM.