HPCC-35552 Improve logging when async connect fails

system/jlib/jsocket.cpp

@@ -153,7 +153,6 @@ static RelaxedAtomic<unsigned> pre_conn_unreach_cnt{0};    // global count of pr
 
 #define IPV6_SERIALIZE_PREFIX (0x00ff00ff)
 
-
 class jlib_thrown_decl SocketException: public IJSOCK_Exception, public CInterface
 {
 public:
@@ -290,6 +289,11 @@ class jlib_thrown_decl SocketException: public IJSOCK_Exception, public CInterfa
     char *msg;
 };
 
+void getSocketErrorMessage(StringBuffer & str, int err)
+{
+    SocketException::geterrormessage(err, str);
+}
+
 IJSOCK_Exception* createJSocketException(int jsockErr, const char *_msg, const char *file, unsigned line)
 {
     StringBuffer msg;

system/jlib/jsocket.hpp

@@ -791,7 +791,7 @@ class jlib_decl CSingletonSocketConnection: implements IConversation, public CIn
 };
 
 extern jlib_decl void shutdownAndCloseNoThrow(ISocket * optSocket);     // Safely shutdown and close a socket without throwing an exception.
-
+extern jlib_decl void getSocketErrorMessage(StringBuffer & str, int err);
 
 #ifdef _WIN32
 #define SOCKETERRNO() WSAGetLastError()

system/security/securesocket/socketutils.cpp

@@ -733,6 +733,12 @@ void CSocketTarget::onAsyncComplete(int result)
         case State::Reconnecting:
             if (result < 0)
             {
+                StringBuffer epText, cause;
+                const char * stateText = (state == State::Connecting) ? "connect" : "reconnect";
+                ep.getEndpointHostText(epText);
+                getSocketErrorMessage(cause, -result);
+                OERRLOG("Failed to %s to %s: %s", stateText, epText.str(), cause.str());
+
                 // Connection failed - clean up socket
                 socket.clear();