diff --git a/src/main/java/org/jenkinsci/remoting/engine/JnlpAgentEndpointResolver.java b/src/main/java/org/jenkinsci/remoting/engine/JnlpAgentEndpointResolver.java
index 3f563d9cb..ee611fc6e 100644
--- a/src/main/java/org/jenkinsci/remoting/engine/JnlpAgentEndpointResolver.java
+++ b/src/main/java/org/jenkinsci/remoting/engine/JnlpAgentEndpointResolver.java
@@ -309,7 +309,7 @@ public JnlpAgentEndpoint resolve() throws IOException {
                 if (tunnel == null) {
                     if (!isPortVisible(host, port)) {
                         firstError = chain(firstError, new IOException(jenkinsUrl + " provided port:" + port
-                                + " is not reachable"));
+                                + " is not reachable on host " + host));
                         continue;
                     } else {
                         LOGGER.log(Level.FINE, "TCP Agent Listener Port availability check passed");