diff --git a/source/3ds/platform.cpp b/source/3ds/platform.cpp
index b3f0517..4f2bacf 100644
--- a/source/3ds/platform.cpp
+++ b/source/3ds/platform.cpp
@@ -484,10 +484,13 @@ public:
 	/// \param func_ Thread entry point
 	privateData_t (std::function<void ()> &&func_) : thread (nullptr), func (std::move (func_))
 	{
+		// use next-lower priority
 		s32 priority = 0x30;
 		svcGetThreadPriority (&priority, CUR_THREAD_HANDLE);
+		priority = std::clamp<s32> (priority, 0x18, 0x3F - 1) + 1;
 
-		thread = threadCreate (&privateData_t::threadFunc, this, STACK_SIZE, priority, -1, false);
+		// use appcore
+		thread = threadCreate (&privateData_t::threadFunc, this, STACK_SIZE, priority, 0, false);
 		assert (thread);
 	}
 
diff --git a/source/ftpServer.cpp b/source/ftpServer.cpp
index f471e68..307ff4c 100644
--- a/source/ftpServer.cpp
+++ b/source/ftpServer.cpp
@@ -299,6 +299,13 @@ void FtpServer::handleNetworkFound ()
 void FtpServer::handleNetworkLost ()
 {
 	{
+		// destroy sessions
+		std::vector<UniqueFtpSession> sessions;
+		LOCKED (sessions = std::move (m_sessions));
+	}
+
+	{
+		// destroy command socket
 		UniqueSocket sock;
 		LOCKED (sock = std::move (m_socket));
 	}
@@ -427,7 +434,14 @@ void FtpServer::loop ()
 	if (m_socket)
 	{
 		Socket::PollInfo info{*m_socket, POLLIN, 0};
-		if (Socket::poll (&info, 1, 0ms) > 0)
+		auto const rc = Socket::poll (&info, 1, 0ms);
+		if (rc < 0)
+		{
+			handleNetworkLost ();
+			return;
+		}
+
+		if (rc > 0 && (info.revents & POLLIN))
 		{
 			auto socket = m_socket->accept ();
 			if (socket)
@@ -436,7 +450,10 @@ void FtpServer::loop ()
 				LOCKED (m_sessions.emplace_back (std::move (session)));
 			}
 			else
+			{
 				handleNetworkLost ();
+				return;
+			}
 		}
 	}
 
diff --git a/source/ftpSession.cpp b/source/ftpSession.cpp
index 8d36acb..9a7958d 100644
--- a/source/ftpSession.cpp
+++ b/source/ftpSession.cpp
@@ -525,7 +525,7 @@ bool FtpSession::poll (std::vector<UniqueFtpSession> const &sessions_)
 				switch (session->m_state)
 				{
 				case State::COMMAND:
-					assert (false);
+					std::abort ();
 					break;
 
 				case State::DATA_CONNECT:
@@ -571,6 +571,7 @@ bool FtpSession::poll (std::vector<UniqueFtpSession> const &sessions_)
 								break;
 						}
 					}
+					break;
 				}
 			}
 		}
@@ -1535,15 +1536,14 @@ void FtpSession::sendResponse (char const *fmt_, ...)
 
 	// try to write data immediately
 	assert (m_commandSocket);
-	auto const bytes =
-	    m_commandSocket->write (m_responseBuffer.usedArea (), m_responseBuffer.usedSize ());
-	if (bytes < 0 && errno != EWOULDBLOCK)
-		closeCommand ();
-	else if (bytes > 0)
+	auto const bytes = m_commandSocket->write (m_responseBuffer);
+	if (bytes <= 0)
 	{
-		m_responseBuffer.markFree (bytes);
-		m_responseBuffer.coalesce ();
+		if (bytes == 0 || errno != EWOULDBLOCK)
+			closeCommand ();
 	}
+	else
+		m_responseBuffer.coalesce ();
 }
 
 void FtpSession::sendResponse (std::string_view const response_)
@@ -1686,7 +1686,7 @@ bool FtpSession::listTransfer ()
 	}
 
 	// send any pending data
-	auto const rc = m_dataSocket->write (m_xferBuffer.usedArea (), m_xferBuffer.usedSize ());
+	auto const rc = m_dataSocket->write (m_xferBuffer);
 	if (rc <= 0)
 	{
 		// error sending data
@@ -1699,7 +1699,6 @@ bool FtpSession::listTransfer ()
 	}
 
 	// we can try to send more data
-	m_xferBuffer.markFree (rc);
 	return true;
 }
 
@@ -1735,7 +1734,7 @@ bool FtpSession::retrieveTransfer ()
 	}
 
 	// send any pending data
-	auto const rc = m_dataSocket->write (m_xferBuffer.usedArea (), m_xferBuffer.usedSize ());
+	auto const rc = m_dataSocket->write (m_xferBuffer);
 	if (rc <= 0)
 	{
 		// error sending data
@@ -1749,7 +1748,6 @@ bool FtpSession::retrieveTransfer ()
 
 	// we can try to read/send more data
 	LOCKED (m_filePosition += rc);
-	m_xferBuffer.markFree (rc);
 	return true;
 }
 
@@ -1759,11 +1757,8 @@ bool FtpSession::storeTransfer ()
 	{
 		m_xferBuffer.clear ();
 
-		auto const buffer = m_xferBuffer.freeArea ();
-		auto const size   = m_xferBuffer.freeSize ();
-
 		// we have written all the received data, so try to get some more
-		auto const rc = m_dataSocket->read (buffer, size);
+		auto const rc = m_dataSocket->read (m_xferBuffer);
 		if (rc < 0)
 		{
 			// failed to read data
@@ -1782,9 +1777,6 @@ bool FtpSession::storeTransfer ()
 			setState (State::COMMAND, true, true);
 			return false;
 		}
-
-		// we received some data
-		m_xferBuffer.markUsed (rc);
 	}
 
 	// write any pending data
@@ -1928,8 +1920,8 @@ void FtpSession::HELP (char const *args_)
 	sendResponse ("214-\r\n"
 	              "The following commands are recognized\r\n"
 	              " ABOR ALLO APPE CDUP CWD DELE FEAT HELP LIST MDTM MKD MLSD MLST MODE\r\n"
-	              " NLST NOOP OPTS PASS PASV PORT PWD QUIT REST RETR RMD RNFR RNTO STAT\r\n"
-	              " STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD\r\n"
+	              " NLST NOOP OPTS PASS PASV PORT PWD QUIT REST RETR RMD RNFR RNTO SITE\r\n"
+	              " SIZE STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD\r\n"
 	              "214 End\r\n");
 }
 
diff --git a/source/socket.cpp b/source/socket.cpp
index 942f469..18f2bee 100644
--- a/source/socket.cpp
+++ b/source/socket.cpp
@@ -171,7 +171,7 @@ bool Socket::shutdown (int const how_)
 {
 	if (::shutdown (m_fd, how_) != 0)
 	{
-		info ("shutdown: %s\n", std::strerror (errno));
+		error ("shutdown: %s\n", std::strerror (errno));
 		return false;
 	}
 
diff --git a/source/switch/init.c b/source/switch/init.c
index ae9c6d9..eecea57 100644
--- a/source/switch/init.c
+++ b/source/switch/init.c
@@ -58,12 +58,10 @@ void userAppInit ()
 	plInitialize ();
 	psmInitialize ();
 	nifmInitialize (NifmServiceType_User);
-
-	if (R_FAILED (socketInitialize (&s_socketInitConfig)))
-		return;
+	socketInitialize (&s_socketInitConfig);
 
 #ifndef NDEBUG
-		// s_fd = nxlinkStdioForDebug ();
+	// s_fd = nxlinkStdioForDebug ();
 #endif
 }