I can't open a new connection to the database after a success database connection (Azure)

Describe the issue
We use Azure Managed PostgreSQL (11). I connect successfuly to the database from spring boot application. While connecting i disable GSS Encryption (gssEncMode=disable)

But after approximately 15 minutes all the other connections are blocked, and we can't connect from another app. we get the following error : FATAL: authentication failed for user "****": too many failed login attempts

Driver Version?
i have tested with 42.2.14. , 42.2.16 and 4.42.18

Spring version
i have tested with 2.1.1.RELEASE and 2.3.4.RELEASE

Java Version?
Java 11 OpenJDK (Windows)

OS Version?
Windows server 2016

PostgreSQL Version?
11

To Reproduce

1. start application that uses pgjdbc to connect to the database.
2. wait for about 15 mins.
3. Open a new connection, i get the error : FATAL: authentication failed for user "****": too many failed login attempts

Thanks for your help !!