Tom Lane, I have read the email you mailed me yesterday. And I have SELinux enabled in permissive mode and the testlibpq program can run. I am very happy. In the future, I will use the PostgreSQL and give up the MySQL and other databases. I think the PostgreSQL is better than the others. Thank you very much. zhuge xiao <zhuge@xxxxxxxxx> Tom Lane wrote: >>"zhuge xiao" <zhuge@xxxxxxxxx> writes: >> >> > >>>>could not connect to server: Permission denied >>>>Is the server running locally and accepting connections on Unix domain >>>>socket "/tmp/.s.PGSQL.5432"? >>>> >>>> > >> >>"Permission denied" indicates a file permissions problem. Check the >>permissions on /tmp and on the socket file itself. If you have SELinux >>enabled in enforcing mode, you might also have a SELinux policy problem >>--- is your selinux-policy package up to date? >> >> regards, tom lane >> >> >> __________________________________________ Yahoo! DSL ? Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com