diff --git a/platform/built-in-server/src/org/jetbrains/ide/StartUpMeasurementService.kt b/platform/built-in-server/src/org/jetbrains/ide/StartUpMeasurementService.kt
index 3a23ce169d6f..57033477f98f 100644
--- a/platform/built-in-server/src/org/jetbrains/ide/StartUpMeasurementService.kt
+++ b/platform/built-in-server/src/org/jetbrains/ide/StartUpMeasurementService.kt
@@ -4,7 +4,9 @@ package org.jetbrains.ide
 import com.intellij.diagnostic.StartUpPerformanceService
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.ex.ApplicationInfoEx
+import com.intellij.openapi.diagnostic.logger
 import com.intellij.util.io.hostName
+import com.intellij.util.io.origin
 import com.intellij.util.net.NetUtils
 import io.netty.buffer.Unpooled
 import io.netty.channel.ChannelHandlerContext
@@ -13,6 +15,8 @@ import io.netty.handler.codec.http.HttpRequest
 import io.netty.handler.codec.http.QueryStringDecoder
 import org.jetbrains.io.response
 
+private val LOG = logger<StartUpMeasurementService>()
+
 internal class StartUpMeasurementService : RestService() {
   override fun getServiceName() = "startUpMeasurement"
 
@@ -42,5 +46,8 @@ internal class StartUpMeasurementService : RestService() {
 
 private fun isTrustedHostName(request: HttpRequest): Boolean {
   val hostName = request.hostName ?: return false
+  if (!NetUtils.isLocalhost(hostName)) {
+    LOG.error("Expected 'request.hostName' to be localhost. hostName=$hostName, origin=${request.origin}")
+  }
   return hostName == "ij-perf.jetbrains.com" || hostName == "ij-perf.develar.org" || NetUtils.isLocalhost(hostName)
 }
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