diff --git a/utils/netutil/src/ip_echo_server.rs b/utils/netutil/src/ip_echo_server.rs
index a608c67ab5..36189bfcc4 100644
--- a/utils/netutil/src/ip_echo_server.rs
+++ b/utils/netutil/src/ip_echo_server.rs
@@ -11,8 +11,8 @@ pub type IpEchoServer = Runtime;
 /// connects.  Used by |get_public_ip_addr|
 pub fn ip_echo_server(port: u16) -> IpEchoServer {
     let bind_addr = SocketAddr::from(([0, 0, 0, 0], port));
-    let tcp =
-        TcpListener::bind(&bind_addr).unwrap_or_else(|_| panic!("Unable to bind to {}", bind_addr));
+    let tcp = TcpListener::bind(&bind_addr)
+        .unwrap_or_else(|err| panic!("Unable to bind to {}: {}", bind_addr, err));
     info!("bound to {:?}", bind_addr);
 
     let server = tcp