diff --git a/application/ChatProtocolMessages.h b/application/ChatProtocolMessages.h
index 4e2e2ac..ffa8689 100644
--- a/application/ChatProtocolMessages.h
+++ b/application/ChatProtocolMessages.h
@@ -402,14 +402,22 @@ enum im_what_code {
 	 * Special messages
 	 */
 
-	//!	Special message forwarded to protocol
+	//!	Special message forwarded to protocol; Unused
 	IM_SPECIAL_TO_PROTOCOL				= 1000,
 
-	//!	Special message forwarded from protocol
+	//!	Special message forwarded from protocol; Unused
 	IM_SPECIAL_FROM_PROTOCOL			= 1001,
 
-	//!	Protocol is ready to receive messages
+	/*!	Protocol is ready				→App
+		Should be sent after connection is established, initialization done */
 	IM_PROTOCOL_READY					= 1002,
+
+	/*! Account has just been disabled	→App
+		Sent as the account disconnects, and will not be automatically
+		reconnected on the add-on's side.
+		Should be sent in two cases: When connection fails due to an error,
+		or when account has been closed by user (ChatProtocol::Shutdown()) */
+	IM_PROTOCOL_DISABLED				= 1003
 };
 
 #endif	// _CHAT_PROTOCOL_MESSAGES_H
diff --git a/protocols/purple/PurpleApp.cpp b/protocols/purple/PurpleApp.cpp
index 5c6f1c1..396fb86 100644
--- a/protocols/purple/PurpleApp.cpp
+++ b/protocols/purple/PurpleApp.cpp
@@ -870,7 +870,6 @@ init_libpurple()
 	BString cachePlugin = BString(purple_cache()).Append("/plugins/");
 	purple_plugins_add_search_path(cachePlugin.String());
 	purple_plugins_add_finddir(B_USER_LIB_DIRECTORY);
-	purple_plugins_add_finddir(B_SYSTEM_LIB_DIRECTORY);
 	purple_plugins_add_finddir(B_USER_NONPACKAGED_LIB_DIRECTORY);
 	purple_plugins_add_finddir(B_SYSTEM_NONPACKAGED_LIB_DIRECTORY);
 
@@ -960,6 +959,12 @@ init_signals()
 
 	purple_signal_connect(purple_accounts_get_handle(), "account-signed-on",
 		&handle, PURPLE_CALLBACK(signal_account_signed_on), NULL);
+	purple_signal_connect(purple_accounts_get_handle(), "account-signed-off",
+		&handle, PURPLE_CALLBACK(signal_account_signed_off), NULL);
+	purple_signal_connect(purple_accounts_get_handle(), "account-disabled",
+		&handle, PURPLE_CALLBACK(signal_account_disabled), NULL);
+	purple_signal_connect(purple_accounts_get_handle(), "account-error-changed",
+		&handle, PURPLE_CALLBACK(signal_account_error_changed), NULL);
 	purple_signal_connect(purple_accounts_get_handle(), "account-status-changed",
 		&handle, PURPLE_CALLBACK(signal_account_status_changed), NULL);
 
@@ -1019,6 +1024,37 @@ signal_account_signed_on(PurpleAccount* account)
 }
 
 
+static void
+signal_account_signed_off(PurpleAccount* account)
+{
+	signal_account_disabled(account);
+}
+
+
+static void
+signal_account_disabled(PurpleAccount* account)
+{
+	BMessage disabled(IM_MESSAGE);
+	disabled.AddInt32("im_what", IM_PROTOCOL_DISABLED);
+	((PurpleApp*)be_app)->SendMessage(account, disabled);
+}
+
+
+static void
+signal_account_error_changed(PurpleAccount* account,
+	const PurpleConnectionErrorInfo* old_error,
+	const PurpleConnectionErrorInfo* current_error)
+{
+	if (current_error == NULL)	return;
+
+	BMessage error(IM_ERROR);
+	error.AddString("error", purple_connection_error_name(current_error));
+	error.AddString("detail", current_error->description);
+	((PurpleApp*)be_app)->SendMessage(account, error);
+}
+
+
+
 static void
 signal_account_status_changed(PurpleAccount* account, PurpleStatus* old,
 	PurpleStatus* cur)
@@ -1473,6 +1509,48 @@ purple_status_to_cardie(PurpleStatus* status)
 }
 
 
+const char*
+purple_connection_error_name(const PurpleConnectionErrorInfo* error)
+{
+	switch (error->type)
+	{
+		case PURPLE_CONNECTION_ERROR_NETWORK_ERROR:
+			return "Connection error";
+		case PURPLE_CONNECTION_ERROR_INVALID_USERNAME:
+			return "Invalid username";
+		case PURPLE_CONNECTION_ERROR_AUTHENTICATION_FAILED:
+			return "Authentication failed";
+		case PURPLE_CONNECTION_ERROR_AUTHENTICATION_IMPOSSIBLE:
+			return "Authentication impossible";
+		case PURPLE_CONNECTION_ERROR_NO_SSL_SUPPORT:
+			return "SSL unsupported";
+		case PURPLE_CONNECTION_ERROR_ENCRYPTION_ERROR:
+			return "Encryption error";
+		case PURPLE_CONNECTION_ERROR_NAME_IN_USE:
+			return "Username in use";
+		case PURPLE_CONNECTION_ERROR_INVALID_SETTINGS:
+			return "Settings invalid";
+		case PURPLE_CONNECTION_ERROR_CERT_NOT_PROVIDED:
+			return "No SSL certificate provided";
+		case PURPLE_CONNECTION_ERROR_CERT_UNTRUSTED:
+			return "Untrusted SSL certificate";
+		case PURPLE_CONNECTION_ERROR_CERT_EXPIRED:
+			return "Expired SSL certificate";
+		case PURPLE_CONNECTION_ERROR_CERT_NOT_ACTIVATED:
+			return "Unactivated SSL certificate";
+		case PURPLE_CONNECTION_ERROR_CERT_HOSTNAME_MISMATCH:
+			return "Certificate and hostname conflict";
+		case PURPLE_CONNECTION_ERROR_CERT_FINGERPRINT_MISMATCH:
+			return "Certifcate and fingerprint conflict";
+		case PURPLE_CONNECTION_ERROR_CERT_SELF_SIGNED:
+			return "Self-signed certificate";
+		case PURPLE_CONNECTION_ERROR_CERT_OTHER_ERROR:
+			return "Certificate error";
+	}
+	return "Misc. error";
+}
+
+
 const char*
 purple_cache()
 {
diff --git a/protocols/purple/PurpleApp.h b/protocols/purple/PurpleApp.h
index 68a06c6..5fd4698 100644
--- a/protocols/purple/PurpleApp.h
+++ b/protocols/purple/PurpleApp.h
@@ -121,6 +121,11 @@ private:
 
 // Account signals
 	 static void		signal_account_signed_on(PurpleAccount* account);
+	 static void		signal_account_signed_off(PurpleAccount* account);
+	 static void		signal_account_disabled(PurpleAccount* account);
+	 static void		signal_account_error_changed(PurpleAccount* account,
+							const PurpleConnectionErrorInfo* old_error,
+							const PurpleConnectionErrorInfo* current_error);
 	 static void		signal_account_status_changed(PurpleAccount* account,
 							PurpleStatus* old, PurpleStatus* cur);
 
@@ -219,6 +224,9 @@ private:
 PurpleStatusPrimitive	cardie_status_to_purple(UserStatus status);
 		UserStatus		purple_status_to_cardie(PurpleStatus* status);
 
+		const char*		purple_connection_error_name(
+							const PurpleConnectionErrorInfo* error);
+
 		const char*		purple_cache();
 			void		purple_plugins_add_finddir(directory_which finddir);