Try creating sockets again if network change occurs after bind failed.

p2p/base/relayport.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include <algorithm>
@@ skipping 482 matching lines @@
     int opts = (ra->proto == PROTO_SSLTCP)
                    ? rtc::PacketSocketFactory::OPT_TLS_FAKE
                    : 0;
     socket = port_->socket_factory()->CreateClientTcpSocket(
         rtc::SocketAddress(port_->Network()->GetBestIP(), 0), ra->address,
         port_->proxy(), port_->user_agent(), opts);
   } else {
     LOG(LS_WARNING) << "Unknown protocol (" << ra->proto << ")";
   }
 
-  if (!socket) {
-    LOG(LS_WARNING) << "Socket creation failed";
-  }
-
   // If we failed to get a socket, move on to the next protocol.
   if (!socket) {
+    LOG(LS_WARNING) << "Socket creation failed";
     port()->thread()->Post(RTC_FROM_HERE, this, kMessageConnectTimeout);
     return;
   }
 
   // Otherwise, create the new connection and configure any socket options.
   socket->SignalReadPacket.connect(this, &RelayEntry::OnReadPacket);
   socket->SignalSentPacket.connect(this, &RelayEntry::OnSentPacket);
   socket->SignalReadyToSend.connect(this, &RelayEntry::OnReadyToSend);
   current_connection_ = new RelayConnection(ra, socket, port()->thread());
   for (size_t i = 0; i < port_->options().size(); ++i) {
@@ skipping 313 matching lines @@
   if (rtc::TimeMillis() - start_time_ <= kRetryTimeout)
     entry_->ScheduleKeepAlive();
 }
 
 void AllocateRequest::OnTimeout() {
   LOG(INFO) << "Allocate request timed out";
   entry_->HandleConnectFailure(connection_->socket());
 }
 
 }  // namespace cricket