diff --git a/lib/_http_server.js b/lib/_http_server.js
index c5681725ca5401..1db0692c2fbef0 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -25,7 +25,6 @@ const {
   ArrayIsArray,
   Error,
   MathMin,
-  NumberIsFinite,
   ObjectKeys,
   ObjectSetPrototypeOf,
   ReflectApply,
@@ -556,12 +555,6 @@ function Server(options, requestListener) {
 
   storeHTTPOptions.call(this, options);
 
-  // Optional buffer added to the keep-alive timeout when setting socket timeouts.
-  // Helps reduce ECONNRESET errors from clients by extending the internal timeout.
-  // Default is 1000ms if not specified.
-  const buf = options.keepAliveTimeoutBuffer;
-  this.keepAliveTimeoutBuffer =
-  (typeof buf === 'number' && NumberIsFinite(buf) && buf >= 0) ? buf : 1000;
   net.Server.call(
     this,
     { allowHalfOpen: true, noDelay: options.noDelay ?? true,
@@ -1031,6 +1024,9 @@ function resOnFinish(req, res, socket, state, server) {
       // Extend the internal timeout by the configured buffer to reduce
       // the likelihood of ECONNRESET errors.
       // This allows fine-tuning beyond the advertised keepAliveTimeout.
+      validateInteger(server.keepAliveTimeoutBuffer, 'keepAliveTimeoutBuffer', 0);
+      validateInteger(server.keepAliveTimeout, 'keepAliveTimeout', 0);
+
       socket.setTimeout(server.keepAliveTimeout + server.keepAliveTimeoutBuffer);
       state.keepAliveTimeoutSet = true;
     }