Adds a new error for cases where a firewall may be the issue.

net/base/net_error_list.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 32 matching lines @@
 // An operation timed out.
 NET_ERROR(TIMED_OUT, -7)
 
 // The file is too large.
 NET_ERROR(FILE_TOO_BIG, -8)
 
 // An unexpected error.  This may be caused by a programming mistake or an
 // invalid assumption.
 NET_ERROR(UNEXPECTED, -9)
 
-// Permission to access a resource was denied.
+// Permission to access a resource, other than the network, was denied.
 NET_ERROR(ACCESS_DENIED, -10)
 
 // The operation failed because of unimplemented functionality.
 NET_ERROR(NOT_IMPLEMENTED, -11)
 
 // There were not enough resources to complete the operation.
 NET_ERROR(INSUFFICIENT_RESOURCES, -12)
 
 // Memory allocation failed.
 NET_ERROR(OUT_OF_MEMORY, -13)
 
 // The file upload failed because the file's modification time was different
 // from the expectation.
 NET_ERROR(UPLOAD_FILE_CHANGED, -14)
 
-// The socket is not connected
+// The socket is not connected.
 NET_ERROR(SOCKET_NOT_CONNECTED, -15)
 
 // A connection was closed (corresponding to a TCP FIN).
 NET_ERROR(CONNECTION_CLOSED, -100)
 
 // A connection was reset (corresponding to a TCP RST).
 NET_ERROR(CONNECTION_RESET, -101)
 
 // A connection attempt was refused.
 NET_ERROR(CONNECTION_REFUSED, -102)
@@ skipping 121 matching lines @@
 
 // The SSL client certificate has no private key.
 NET_ERROR(SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY, -135)
 
 // The certificate presented by the HTTPS Proxy was invalid.
 NET_ERROR(PROXY_CERTIFICATE_INVALID, -136)
 
 // An error occurred when trying to do a name resolution (DNS).
 NET_ERROR(NAME_RESOLUTION_FAILED, -137)
 
+// Permission to access the network was denied. This is used to distinguish
+// access denied errors that were most likely caused by a firewall.
+// See also ERR_ACCESS_DENIED.
+NET_ERROR(NETWORK_ACCESS_DENIED, -138)
+
 // Certificate error codes
 //
 // The values of certificate error codes must be consecutive.
 
 // The server responded with a certificate whose common name did not match
 // the host name.  This could mean:
 //
 // 1. An attacker has redirected our traffic to his server and is
 //    presenting a certificate for which he knows the private key.
 //
@@ skipping 276 matching lines @@
 // Import failed - certificate already exists in database.
 // Note it's a little weird this is an error but reimporting a PKCS12 is ok
 // (no-op).  That's how Mozilla does it, though.
 NET_ERROR(IMPORT_CERT_ALREADY_EXISTS, -704)
 
 // CA import failed due to some other error.
 NET_ERROR(IMPORT_CA_CERT_FAILED, -705)
 
 // Server certificate import failed due to some internal error.
 NET_ERROR(IMPORT_SERVER_CERT_FAILED, -706)