Nikhil Shetty <nikhil(dot)dba04(at)gmail(dot)com> writes:
> We were using MTLS to connect to the database. We noticed that even after
> server certificates expired the client was able to connect to the database.
> 1. Doesn't postgres check the expiry date of the certificate?
Postgres does not. The openssl library can. The most likely
guess, on the basis of the next-to-zero details you provided,
is that the connection is succeeding via some method that doesn't
require the client to check the server's certificate --- for
instance, a completely unencrypted connection.
regards, tom lane