On Wed, 2024-09-25 at 10:57 +0530, Danish Hajwane wrote: > We are getting error after doing replication on posrgresql 16.3 (OS is HP UX) > error is regarding Libpq library, we are unable to start sync getting error > > FATAL: could not connect to the primary server : libpq is incorrectly linked to backend functions. > LOG: waiting for WAL to become available at 0/36000018. That means that there was a problem dynamically loading the PostgreSQL client library into the server. This depends a lot on how you built PostgreSQL, what operating system you have and so on. You didn't tell us anything about these details. Yours, Laurenz Albe