diff -Nur libjingle0.3-0.3.11/talk/p2p/base/tcpport.cc libjingle0.3-0.3.11.new/talk/p2p/base/tcpport.cc
--- libjingle0.3-0.3.11/talk/p2p/base/tcpport.cc	2007-04-25 16:45:58.000000000 +0100
+++ libjingle0.3-0.3.11.new/talk/p2p/base/tcpport.cc	2007-05-01 17:19:29.000000000 +0100
@@ -211,7 +211,10 @@
 
 int TCPConnection::Send(const void* data, size_t size) {
   if (write_state() != STATE_WRITABLE)
-    return 0;
+  {
+    error_ = EWOULDBLOCK;
+    return SOCKET_ERROR;
+  }
 
   int sent = socket_->Send(data, size);
   if (sent < 0) {