本地 PostgresSQL 中的“连接被拒绝”，但它以前工作过

Question

I am not a programmer, I do my best, but I need help. I created and managed postgressql DB for my department needs on localhost, Windows. I set required ip to listens in postgresql.conf and configured pg_hba.conf. And it worked fine for 3 months.

But today I came to work, tried to connect to Postgresql server. And see this:

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?

I checked configs - there are no changes. I tested settings with listened_ip='*'. Still not working. And I see that message when i try to create new server.

What happened? How to fix all this?

Answer 1

Assuming you have not alteres pg_hba.conf file, you can start your postgres from windows cmd.exe using

net start postgresql-9.8

instead of 9.8, you use your postgres version number. Other way round you can look for your services from (start -> run -> services.msc)

Answer 2

The general thought/assumptions:

It looks like it is pgAdmin (probably version 4) or your admin rights or one of the files mentioned above (postgresql.conf and/or pg_hba.conf).

I had the same error and even a password error (for the correct password) after being a step further by some todo's and fixes that helped other people in previous versions;

But none of them worked for postgresql version 12.3 and/or postgresql version 11.8

Solution versions:

The only thing that helped after two hours was: As explained in this post: ' PostgreSQL Install fail on Windows 10 (icalcs error/acces denied) ' on the superuser forum of StackExchange:

• Uninstall en reinstall postgresql. The official version provided by EDB through this link: postgresql.org/download ; Or try a different version if you are sure this one doesn't work for you. Therefor head to the 'File Browser'of Postgresql: here
• After reinstall, start pgAdmin from the Start Menu (scroll for the folder and the correct related pgAdmin; an older version could still hang around in the shortcuts and won't start).

Note: You can keep your data map so nothing is lost!

In my case eg: I removed the /data folder from the (Windows 10) [Drive]/Program Files/PostgreSQL/11 and as soon as I uninstalled version 11.2 and reinstalled (earlier removed 12) version 12: when I started pgAdmin4 my former servers ([nameA] and [PostgreSQL 11] and databases ánd the new server [PostgreSQL 12] were there! And the connection was reestablished

Tried:

Earlier tried solutions that did not work in my case:

• Question 37307346 'Is the server running on host localhost 1 and accepting tcp ip connections on port 5432?'
• Question 40532399 'Unable to connect to server for postgres'
• Database Administrators StackExchange: Problems connecting to Windows-based PostgreSQL
• Question 16904997 'Connection refused pgerror postgresql and rails'
• Question 60532791 'Timeout expired pgadmin unable to connect to server' note: This was after semi solution of netstat running postgres service (port was not used before that solution; here listed as 4th item, item above).

Answer 3

if you've installed the official postgreSQL on Windows accepting all default settings, maybe you need to manually start the service (Run cmd.exe as admin and enter this command) each time you start querying:

pg_ctl -D "C:\Program Files\PostgreSQL\[YOUR_POSTGRESQL_VERSION]\data" start

in my case is:

pg_ctl -D "C:\Program Files\PostgreSQL\12\data" start