Hi, Thanks for the replies and the help, but unfortunately it did not help my case to just simply add and enable the missing flags as it is stated here: > In order to allow the code to compile with > OpenSSL 1.1.0, all the flags mentioned above need to be enabled in > pg_config.h.win32 https://www.postgresql.org/message-id/20180624221521.GA7755@xxxxxxxxxx I suppose it is only relevant for version 11, but since I am using 9.6 it does not help. Since my code is not out for production yet and AWS is also supporting Postgres 11 I could switch to version 11, but it is important for me to be sure that it will solve my problem and I could compile Postgresql 11 for windows and use it as an On-Premise and also in AWS. What do you think? Should I just switch to version 11 and leave the not working 9.6 version behind and then I could ? Thanks, Best, Adam -- Sent from: http://www.postgresql-archive.org/PostgreSQL-general-f1843780.html