I have a C # system running as a windows service, with Windows Server 2012 R2.
Eventually when the service tries to communicate with the database (to make a query or to make an insert, for example) the communication between the windows server and the host where the database is running "crashed" and then it is the Oracle ORA-12571 error was generated.
We already know that this is not a problem in the database, but in communication between hosts.
To solve, simply re-run the service and everything happens smoothly.
The worst thing is that the windows event log does not capture anything that might help us or gives a clue about the problem.
If you need more details, just ask!
Thank you in advance.