Qlik Replicate: Failed to load Postgres driver Cannot load libpq-dll

sureshkumar — Tue, 25 Aug 2026 14:00:23 GMT

Testing the PostgreSQL Source Endpoint in Qlik Replicate may fail with the following error:

Failed to load Postgres driver. Cannot load libpq.dll

You should have two entries in the system environment variables pointing to the following folders (default locations):

Both folders must include the libpq.dll file.

If the connection test fails even with libpq.dll present in both directories, then:

Copy the libpq.dll file from odbc\bin (C:\Program Files\psqlODBC\1202\bin) to ~\Replicate\bin
Restart the Qlik Replicate server service and the Replicate UI server service

article Qlik Replicate: Failed to load Postgres driver Cannot load libpq-dll in Official Support Articles