Linux: Fallback to SSL if server closes early during TLS handshake.

net/base/ssl_client_socket_nss.cc

Index: net/base/ssl_client_socket_nss.cc
diff --git a/net/base/ssl_client_socket_nss.cc b/net/base/ssl_client_socket_nss.cc
index d64d791d909d06f880674c4c06f85484e01dbc1f..c48f0b06e2d2fd57500c725f2f08d75bb89e980a 100644
--- a/net/base/ssl_client_socket_nss.cc
+++ b/net/base/ssl_client_socket_nss.cc
@@ -691,7 +691,14 @@ int SSLClientSocketNSS::DoHandshakeRead() {
     // Done!
   } else {
     PRErrorCode prerr = PR_GetError();
-    net_error = NetErrorFromNSPRError(prerr);
+
+    // If the server closed on us, it is a protocol error.
+    // Some TLS-intolerant servers do this when we request TLS.
+    if (prerr == PR_END_OF_FILE_ERROR) {
+      net_error = ERR_SSL_PROTOCOL_ERROR;
+    } else {
+      net_error = NetErrorFromNSPRError(prerr);
+    }
 
     // If not done, stay in this state
     if (net_error == ERR_IO_PENDING) {