PostgreSQL：无法连接到服务器 - 连接被拒绝错误

Question

I've failed to set up postgreSQL to work with my Ruby-on-Rails project for the past week.
I've tried to uninstall and reinstall, postgreSQL , twice now.
But when I try to launch postgreSQL I keep getting the error below:

could not connect to server: Connection refused (0x0000274D/10061)
         Is the server running on host "localhost" (::1) and
         accepting TCP/IP connections on port 5432? 
could not connect to server: Connection refused (0x0000274D/10061) 
         Is the server running on host "localhost" (127.0.0.1) and 
         accepting TCP/IP connections on port 5432?"

I've looked at many online resources, including stackoverflow and none seem helpful.
The key parts of my pg_hba.conf file looks like this:

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
#host    replication     postgres        127.0.0.1/32            md5
#host    replication     postgres        ::1/128                 md5

And the key part of my postgresql.conf file is as follows:

listen_addresses = '*'      # what IP address(es) to listen on;
                    # comma-separated list of addresses;
                    # defaults to 'localhost'; use '*' for all
                    # (change requires restart)
port = 5432             # (change requires restart)
max_connections = 100           # (change requires restart)
#superuser_reserved_connections = 3 # (change requires restart)
#unix_socket_directories = ''   # comma-separated list of directories
                    # (change requires restart)
#unix_socket_group = ''         # (change requires restart)
#unix_socket_permissions = 0777     # begin with 0 to use octal notation

Most of the suggestions, I've seen so far, were based on those two files. (For my case, they were already configured correctly). I also tried disabling the firewall and restarting postgreSQL but it didn't help. Does anyone have any suggestions for me? Thanks!

Answer 1

Got the same issue while settings up PostgreSQL 9.6.16 to work with Python/Django, but this is purely a database issue.

The solution lies in the error: In fact, I found this error mentioned within the official PostgreSQL documentation thus it's a common error.

And here is how I resolved this issue:

1. Always first start the postgres database server , use postgres or the wrapper program pg_ctl .
   I used the command, below, on windows 10 .
   Remember, whatever comes after -D should be the path to where you installed PostgreSQL, to the data folder, which holds the pg_hba.conf and postgresql.conf files.

> pg_ctl start -D "C:/Program Files/PostgreSQL/9.6/data"

2. If that runs well, you are ready to access the database server.
   Open another cmd shell, and type the command below.
   Remember the password you entered while installing PostgreSQL ?
   Enter that password when asked Password for user postgres:

> psql -U postgres

Once done, you can now go ahead to CREATE ROLE and CREATE DATABASE accordingly.

Answer 2

[SOLVED]

After much more research. I looked in depth at the error I was receiving post downloading and came to this solution here

Best of luck for anyone having the same issue!