Ensure that the import/export feature should work with SSH Tunnel. Fixes #5739

docs/en_US/release_notes_4_27.rst

@@ -18,6 +18,7 @@ Bug fixes
 *********
 
 | `Issue #5417 <https://redmine.postgresql.org/issues/5417>`_ -  Fixed and improve API test cases for the schema diff tool.
+| `Issue #5739 <https://redmine.postgresql.org/issues/5739>`_ -  Ensure that the import/export feature should work with SSH Tunnel.
 | `Issue #5802 <https://redmine.postgresql.org/issues/5802>`_ -  Remove maximum length on the password field in the server dialog.
 | `Issue #5807 <https://redmine.postgresql.org/issues/5807>`_ -  Fixed an issue where a column is renamed and then removed, then the drop SQL query takes the wrong column name.
 | `Issue #5830 <https://redmine.postgresql.org/issues/5830>`_ -  Fixed reverse engineering SQL where parenthesis is not properly arranged for View/MView definition.

web/pgadmin/tools/import_export/__init__.py

@@ -342,8 +342,12 @@ def create_import_export_job(sid):
         manager.export_password_env(p.id)
 
         env = dict()
-        env['PGHOST'] = server.host
-        env['PGPORT'] = str(server.port)
+
+        env['PGHOST'] = \
+            manager.local_bind_host if manager.use_ssh_tunnel else server.host
+        env['PGPORT'] = \
+            str(manager.local_bind_port) if manager.use_ssh_tunnel else str(
+                server.port)
         env['PGUSER'] = server.username
         env['PGDATABASE'] = data['database']
         p.set_env_variables(server, env=env)