diff --git a/client/src/core/windows/pop.cc b/client/src/core/windows/pop.cc
index c228e0e..23b94ce 100644
--- a/client/src/core/windows/pop.cc
+++ b/client/src/core/windows/pop.cc
@@ -44,11 +44,31 @@
 
  namespace TN3270 {
 
+	class InvalidFormatException : public std::exception {
+	private:
+		string message;
+
+	public:
+		InvalidFormatException(const IPC::Request::Type received, const IPC::Request::Type expected) {
+
+			message = "Invalid format on IPC package, expecting \'";
+			message += (char) expected;
+			message += "\' but received \'";
+			message += (char) received;
+			message += "\'";
+
+		}
+
+		const char * what() const noexcept override {
+			return message.c_str();
+		}
+	};
+
 	IPC::Request & IPC::Request::pop(std::string &value) {
 		DataBlock * block = getNextBlock();
 
 		if(block->type != IPC::Request::String)
-			throw std::runtime_error("Invalid format");
+			throw InvalidFormatException(block->type, IPC::Request::String);
 
 		const char *ptr = (const char *) (block+1);
 
@@ -80,7 +100,7 @@
 			break;
 
 		default:
-			throw std::runtime_error("Invalid format");
+			throw InvalidFormatException(block->type, IPC::Request::Int16);
 		}
 
 		return *this;
@@ -107,7 +127,7 @@
 			break;
 
 		default:
-			throw std::runtime_error("Invalid format");
+			throw InvalidFormatException(block->type, IPC::Request::Uint16);
 		}
 
 		return *this;
@@ -139,7 +159,7 @@
 			break;
 
 		default:
-			throw std::runtime_error("Invalid format");
+			throw InvalidFormatException(block->type, IPC::Request::Boolean);
 		}
 
 		return *this;
diff --git a/client/src/core/windows/request.cc b/client/src/core/windows/request.cc
index f805bea..d7184eb 100644
--- a/client/src/core/windows/request.cc
+++ b/client/src/core/windows/request.cc
@@ -37,6 +37,7 @@
  */
 
  #include <ipc-client-internals.h>
+ #include <lib3270/trace.h>
 
  using std::string;
 
@@ -46,6 +47,51 @@
 
 	#define PIPE_BUFFER_LENGTH 8192
 
+#ifdef DEBUG
+
+	// From lib3270_trace_data
+	static void trace_data(const char *msg, const unsigned char *data, size_t datalen)
+{
+	// 00000000001111111111222222222233333333334444444444555555555566666666667777777777
+	// 01234567890123456789012345678901234567890123456789012345678901234567890123456789
+	// xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx . . . . . . . . . . . . . . . .
+
+	size_t ix;
+	char buffer[80];
+	char hexvalue[3];
+
+	memset(buffer,0,sizeof(buffer));
+
+	std::cout << msg << "(" << datalen << " bytes)" << std::endl;
+
+	for(ix = 0; ix < datalen; ix++)
+	{
+		size_t col = (ix%15);
+
+		if(col == 0)
+		{
+			if(ix) {
+				std::cout << "\t" << buffer << std::endl;
+			}
+
+			memset(buffer,' ',79);
+			buffer[79] = 0;
+		}
+
+		snprintf(hexvalue,3,"%02x",data[ix]);
+		memcpy(buffer+(col*3),hexvalue,2);
+
+		if(data[ix] > ' ')
+			buffer[48 + (col*2)] = data[ix];
+
+	}
+
+	std::cout << "\t" << buffer << std::endl;
+
+}
+
+#endif // DEBUG
+
 	IPC::Request::Request(HANDLE hPipe, const char *name, uint16_t type) {
 
 		this->hPipe = hPipe;
@@ -114,7 +160,7 @@
 	IPC::Request & IPC::Request::call() {
 
 #ifdef DEBUG
-		// lib3270_trace_data(NULL,"Request block",(const char *) this->out.block, this->out.used);
+		// trace_data("Request block",(const unsigned char *) this->out.block, this->out.used);
 #endif // DEBUG
 
 		debug("Sending request with ", *this->outvalues, " elements");
@@ -137,8 +183,19 @@
 
 		debug("Received response \"", in.block, "\" with ", in.used, " bytes");
 
+		//
+		// Heaer format:
+		//
+		// STRING	Response name
+		// uint16_t	Return code
+		// uint16_t	Arguments
+		//
+		// Data block:
+		//
+		//
+
 #ifdef DEBUG
-		// lib3270_trace_data(NULL,"Response block",(const char *) this->in.block, this->in.used);
+		trace_data("Response block",(const unsigned char *) this->in.block, this->in.used);
 #endif // DEBUG
 
 		// Extract response name
diff --git a/client/src/include/lib3270/ipc/request.h b/client/src/include/lib3270/ipc/request.h
index bca63b3..dcd3ac5 100644
--- a/client/src/include/lib3270/ipc/request.h
+++ b/client/src/include/lib3270/ipc/request.h
@@ -58,12 +58,8 @@
 
 			/// @brief PW3270 IPC Request/Response.
 			class TN3270_PUBLIC Request {
-			private:
-
+			public:
 #ifdef _WIN32
-				/// @brief Pipe Handle.
-				HANDLE hPipe;
-
 				/// @brief IPC Data type.
 				enum Type : uint8_t {
 					String	= 's',
@@ -77,6 +73,13 @@
 					Int64	= 'x',
 					Uint64	= 't'
 				};
+#endif // _WIN32
+
+			private:
+
+#ifdef _WIN32
+				/// @brief Pipe Handle.
+				HANDLE hPipe;
 
 				struct {
 					DWORD 	  length;	///< @brief Length of input buffer.
diff --git a/client/src/testprogram/testprogram.cc b/client/src/testprogram/testprogram.cc
index 22c86ff..342adae 100644
--- a/client/src/testprogram/testprogram.cc
+++ b/client/src/testprogram/testprogram.cc
@@ -99,12 +99,19 @@
  */
 
  // Test Attributes
- static void testAttributes(const char *session, const char *url) {
+ static void testAttributes(const char *session, const char *name) {
 
 	TN3270::Host host{session};
 
+	name="url";
+
+	cout << endl << endl;
 	for(auto attribute : host.getAttributes()) {
 
+		if(name && *name && strcasecmp(name,"all") && strcasecmp(attribute.getName(),name)) {
+			continue;
+		}
+
 		cout << attribute.getName() << ":\t";
 
 		try {
@@ -113,13 +120,17 @@
 
 		} catch(const std::exception &e) {
 
-			cout << e.what();
+			cout << "Exception(" << e.what() << ")";
 		}
 
 		cout << endl;
 
+		Sleep(100);
+
 	}
 
+	cout << endl << endl;
+
  }
 
  // Performance test.
@@ -237,17 +248,18 @@
 #if ! defined(_MSC_VER)
 
 	static struct option options[] = {
-		{ "session",	required_argument,	0,	's' },
-		{ "url",		required_argument,	0,	'U' },
-		{ "perftest",	no_argument,		0,	'P' },
-		{ "info",		no_argument,		0,	'I' },
+		{ "session",	required_argument,		0,	's' },
+		{ "url",		required_argument,		0,	'U' },
+		{ "perftest",	no_argument,			0,	'P' },
+		{ "attribute",	optional_argument,		0,	'A' },
+		{ "info",		no_argument,			0,	'I' },
 		{ 0, 0, 0, 0}
 
 	};
 
 	int long_index =0;
 	int opt;
-	while((opt = getopt_long(argc, argv, "s:", options, &long_index )) != -1) {
+	while((opt = getopt_long(argc, argv, "s:A", options, &long_index )) != -1) {
 
 		switch(opt) {
 		case 's':
@@ -255,6 +267,10 @@
 			cout << "Session: " << session << endl;
 			break;
 
+		case 'A':
+			testAttributes(session,optarg);
+			break;
+
 		case 'U':
 			url = optarg;
 			cout << "URL: " << session << endl;
diff --git a/server/src/core/getproperties.c b/server/src/core/getproperties.c
index ca44154..5641f9f 100644
--- a/server/src/core/getproperties.c
+++ b/server/src/core/getproperties.c
@@ -127,6 +127,7 @@ GVariant * ipc3270_get_property(GObject *object, const gchar *property_name, GEr
 		if(strprop[ix].get && !g_ascii_strcasecmp(strprop[ix].name, property_name)) {
 
 			// Found it!
+			errno = 0;
 			const char * value = strprop[ix].get(hSession);
 
 			if(value) {
@@ -134,9 +135,14 @@ GVariant * ipc3270_get_property(GObject *object, const gchar *property_name, GEr
 				return g_variant_new_string(value);
 			}
 
-			// Erro!
-			ipc3270_set_error(object,errno,error);
-			return NULL;
+			debug("%s=%s",property_name,"NULL");
+
+			if(errno) {
+				ipc3270_set_error(object,errno,error);
+				return NULL;
+			}
+
+			return g_variant_new_string("");
 
 		}
 
diff --git a/server/src/core/windows/inout.c b/server/src/core/windows/inout.c
index 8576ad1..b8cfd9f 100644
--- a/server/src/core/windows/inout.c
+++ b/server/src/core/windows/inout.c
@@ -59,7 +59,7 @@ unsigned char * ipc3270_pack_error(const GError *error, size_t * szPacket) {
 	txtptr += strlen((char *) txtptr) + 1;
 
 	// Add RC
-	*((guint16 *) txtptr) = (guint16) error->code;
+	*((guint16 *) txtptr) = (guint16) (error->code ? error->code : -1);
 	txtptr += sizeof(guint16);
 
 	// Add message
--
libgit2 0.21.2