Fixed connection and version number detection issue when the database server is upgraded. Fixes #5507

docs/en_US/release_notes_4_23.rst

@@ -23,5 +23,6 @@ Bug fixes
 | `Issue #3787 <https://redmine.postgresql.org/issues/3787>`_ -  Disabled the Stop process button after clicking it and added a message 'Terminating the process...' to notify the user.
 | `Issue #5416 <https://redmine.postgresql.org/issues/5416>`_ -  Ensure that the query tool panel gets closed when clicking on the 'Don't Save' button.
 | `Issue #5465 <https://redmine.postgresql.org/issues/5465>`_ -  Fixed an issue where the Edge browser version is showing wrong and warning message gets displayed.
+| `Issue #5507 <https://redmine.postgresql.org/issues/5507>`_ -  Fixed connection and version number detection issue when the database server is upgraded.
 | `Issue #5521 <https://redmine.postgresql.org/issues/5521>`_ -  Fixed an issue when dumping servers from a desktop pgAdmin app by providing an option '--sqlite-path'.
 | `Issue #5539 <https://redmine.postgresql.org/issues/5539>`_ -  Fixed typo in exception keyword.

web/pgadmin/utils/driver/psycopg2/connection.py

@@ -439,7 +439,7 @@ class Connection(BaseConnection):
                         "Failed to setup the role with error message:\n{0}"
                     ).format(status)
 
-        if manager.ver is None:
+        # Check database version every time on reconnection
         status = _execute(cur, "SELECT version()")
 
         if status is not None:

web/pgadmin/utils/driver/psycopg2/server_manager.py

@@ -263,9 +263,6 @@ WHERE db.oid = {0}""".format(did))
 
         from pgadmin.browser.server_groups.servers.types import ServerType
 
-        self.ver = data.get('ver', None)
-        self.sversion = data.get('sversion', None)
-
         if self.ver and not self.server_type:
             for st in ServerType.types():
                 if st.instanceOf(self.ver):