Oh, I was blind.
This other topic, had solution:
We’ve just solved the problem by copying following .xml file to the following path indicated below.
XML FILE : http://community-downloads.quest.com/toadsoft/ORACLE/VERSION/online_resources.xml
PATH: C:\Users\AppData\Roaming\Quest Software\Toad for Oracle\13.0\User Files
After the copy process you have to restart TOAD.
At first wrong password attempt, TOAD waits for a while. Then you’ll get a quick response for the wrong password attempts.