Have you checked the local settings in the pg_hba.conf as this will affect permitted access.
You can compare what is set differently between the different versions of postgreSQL.
Cheers
Peter
On 2/13/2020 at 5:11 PM, "Jeff Janes" <jeff.janes@gmail.com> wrote:
>
>On Thu, Feb 13, 2020 at 11:23 AM Murali Paramu
><ipmurali@gmail.com> wrote:
>
>> Hello Team,
>> I have two versions of PostgreSQL 9.4 and 12.1
>> both servers can be connected through pgAdmin.
>> But through psql I can connect only to 12.1
>>
>> when i connect to 9.4 got below error:
>>
>>
>>
>>
>> *$ psql -U postgres -p 5432psql: error: could not connect to
>server: could
>> not connect to server: No such file or directory Is the server
>running
>> locally and accepting connections on Unix domain socket
>> "/var/run/postgresql/.s.PGSQL.5432"?*
>>
>>
>Perhaps 9.4 is configured to put its socket file in /tmp instead of
>/var/run/postgresql/. You can try -h /tmp, or you can just always
>use -h
>127.0.0.1, then you don't need to worry where the socket file is.
>
>Cheers,
>
>Jeff
