Bug 1315332 - Don't reuse the connection for conn-based auth schemes when asking user for credentials, r=mcmanus

netwerk/protocol/http/nsHttpChannelAuthProvider.cpp

@@ -1222,6 +1222,16 @@ nsHttpChannelAuthProvider::PromptForIdentity(uint32_t            level,
     if (!proxyAuth)
         mSuppressDefensiveAuth = true;
 
+    if (mConnectionBased) {
+        // Connection can be reset by the server in the meantime user is entering
+        // the credentials.  Result would be just a "Connection was reset" error.
+        // Hence, we drop the current regardless if the user would make it on time
+        // to provide credentials.
+        // It's OK to send the NTLM type 1 message (response to the plain "NTLM"
+        // challenge) on a new connection.
+        mAuthChannel->CloseStickyConnection();
+    }
+
     return rv;
 }