From 12ebfa0c820f925e56338d373fe084b91633b72e Mon Sep 17 00:00:00 2001
From: James Moore <james@restphone.com>
Date: Sun, 12 Aug 2018 09:11:39 -0700
Subject: [PATCH] net_plugin::plugin_startup gives more information when it
 attempts to bind to a port

Helps people diagnose problems with issues like #3999.
---
 plugins/net_plugin/net_plugin.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/plugins/net_plugin/net_plugin.cpp b/plugins/net_plugin/net_plugin.cpp
index 5363f035210..5aa6883e537 100644
--- a/plugins/net_plugin/net_plugin.cpp
+++ b/plugins/net_plugin/net_plugin.cpp
@@ -3008,7 +3008,13 @@ namespace eosio {
       if( my->acceptor ) {
          my->acceptor->open(my->listen_endpoint.protocol());
          my->acceptor->set_option(tcp::acceptor::reuse_address(true));
-         my->acceptor->bind(my->listen_endpoint);
+         try {
+           my->acceptor->bind(my->listen_endpoint);
+         } catch (const std::exception& e) {
+           ilog("net_plugin::plugin_startup failed to bind to port ${port}",
+             ("port", my->listen_endpoint.port()));
+           throw e;
+         }
          my->acceptor->listen();
          ilog("starting listener, max clients is ${mc}",("mc",my->max_client_count));
          my->start_listen_loop();