Hi @Jos_Wilbrink ,
we did some investigation and noticed that we upgraded the postgresql jdbc driver by 2 patch versions ( 42.2.14 to 42.2.16 ). and with that we dug deeper if there are any issues with this version connected to azure, and indeed there is one documented in the azure docs that hits what you observed perfectly!
please try to disable GSS explicitly in the connect string, so like this:
jdbc:postgresql://xxxxx.postgres.database.azure.com:5432/xxxx?gssEncMode=disable