Connection refused when trying connecting to postgresql - postgresql

#Edit
Sorry its not connect to PostgreSQL but im trying to connect to materialized shell but it's getting an error like below
psql: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 6875?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 6875?
how can i solve this?
Thanks.

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Is the server running on that host and accepting TCP/IP connections?
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i get the following error: could not connect to server: Connection refused Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5432?...

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Error message:
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?
The server is running on localhost and should be accepting connections to port 5432 according to the postgresql.conf file.

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pg_dump: [archiver (db)] connection to database "database-name" failed: could not connect to server: Connection refused
`Is the server running on host "localhost" (::1) and accepting`
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (fe80::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
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TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (fe80::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
! Heroku client internal error.
! Search for help at: https://help.heroku.com
! Or report a bug at: https://github.com/heroku/heroku/issues/new
Error: psql failed. exit status 512, output: "" (RuntimeError)
Command: heroku pg:push database-name DATABASE_URL --app app-name
Version: heroku-toolbelt/3.39.5 (x86_64-darwin10.8.0) ruby/1.9.3
Error ID: 020bc5cc53ec48298f24125be8705f53
Any insight would be much appreciated. I have been struggling with this for several hours. Thanks!