The dreaded “PG::ConnectionBad - might not link to server: Transportation refused” mistake. It’s a PostgreSQL developer’s nightmare, halting advancement and triggering a frantic hunt for options. This mistake communication basically means your exertion tin’t found a transportation to your PostgreSQL database server. Whether or not you’re a seasoned database head oregon conscionable beginning retired, encountering this transportation nonaccomplishment tin beryllium irritating. This blanket usher volition dissect the communal causes of this PostgreSQL transportation mistake, supply applicable options, and equip you with the cognition to forestall early occurrences.
Knowing the PG::ConnectionBad Mistake
The “Transportation refused” communication signifies that the PostgreSQL server isn’t listening connected the specified larboard oregon adult, oregon that thing is blocking the transportation. This differs from another transportation errors similar “Transportation timed retired,” which signifies the server is reachable however not responding inside a fixed timeframe. Pinpointing the base origin requires a systematic attack, checking assorted configuration settings and web circumstances.
For case, ideate making an attempt to call a person however their telephone is disconnected. That’s analogous to the “Transportation refused” mistake. The database server is efficaciously “disconnected” oregon unreachable from your exertion’s position. Connected the another manus, a “Transportation timed retired” mistake is similar calling a person whose telephone rings endlessly with out an reply.
Communal Causes and Options
Respective components tin lend to this transportation job. Fto’s research the about communal culprits and their corresponding options:
Incorrect Hostname oregon IP Code
Treble-cheque that your exertion is utilizing the accurate hostname oregon IP code for the PostgreSQL server. A elemental typo tin pb to transportation nonaccomplishment. Confirm the server’s code successful your database transportation drawstring. Usage the psql -h [hostname/IP] -U [username] -d [database] bid to trial the transportation straight from the bid formation.
Illustration: If your server is moving domestically, guarantee you’re utilizing localhost oregon 127.zero.zero.1. For distant servers, usage the accurate area sanction oregon IP code.
Incorrect Larboard Figure
PostgreSQL defaults to larboard 5432. If your server is configured to perceive connected a antithetic larboard, your exertion’s transportation drawstring essential indicate this. Corroborate the larboard figure successful your postgresql.conf record and replace your exertion’s transportation settings accordingly.
Frequently, unreality internet hosting suppliers whitethorn delegate dynamic ports. Beryllium certain to cheque your supplier’s documentation oregon dashboard for the accurate larboard accusation.
Firewall Points
Firewalls tin artifact connections to your PostgreSQL server. Guarantee that your server’s firewall permits incoming connections connected the PostgreSQL larboard (normally 5432). You mightiness demand to adhd a firewall regulation to explicitly license entree. Connected Linux methods, instruments similar iptables oregon firewalld tin negociate firewall guidelines. Seek the advice of your working scheme’s documentation for circumstantial directions. Cautiously configured firewalls are important for safety.
See utilizing safety teams successful unreality environments similar AWS oregon Azure to negociate inbound and outbound collection guidelines for your database cases.
SELinux Configuration (Linux)
Connected Linux programs with SELinux enabled, strict safety insurance policies tin forestall connections. You mightiness demand to configure SELinux to let PostgreSQL to judge connections. Usage the getsebool -a | grep postgresql bid to cheque SELinux settings associated to PostgreSQL. Instructions similar setsebool -P postgresql_can_network_connect_db connected tin modify these settings. Nevertheless, cautiously reappraisal the implications of altering SELinux insurance policies earlier implementing immoderate adjustments.
Improperly configured SELinux guidelines tin make safety vulnerabilities. Seek the advice of the SELinux documentation for champion practices.
pg_hba.conf Settings
The pg_hba.conf record controls case authentication. Incorrect settings successful this record tin pb to transportation refusals. Guarantee that the record permits connections from your exertion’s IP code oregon adult. This record usually resides successful the PostgreSQL information listing. All formation successful this record defines a regulation for permitting oregon denying connections based mostly connected components similar case IP code, database sanction, and authentication methodology.
Knowing the syntax and choices inside pg_hba.conf is critical for unafraid and decently functioning database entree.
Troubleshooting Steps
- Confirm server position: Guarantee the PostgreSQL work is moving. Usage sudo work postgresql position (oregon the equal bid for your scheme) to cheque.
- Cheque logs: Analyze the PostgreSQL server logs for immoderate mistake messages associated to transportation makes an attempt. The log determination varies relying connected your set up.
- Web connectivity: Usage the ping bid to cheque web connectivity betwixt your exertion server and the database server.
- Telnet trial: Usage telnet [hostname/IP] 5432 to cheque if the larboard is unfastened and accepting connections. A palmy transportation volition consequence successful a clean surface.
- Guarantee your exertion’s database transportation drawstring is close, together with the username, password, database sanction, adult, and larboard.
- Restart the PostgreSQL server: Generally, a elemental restart tin resoluteness transient points.
Infographic Placeholder: Ocular cooperation of communal transportation points and their options.
“Database connections are cardinal to exertion performance. Appropriate configuration and troubleshooting are important for sustaining a dependable and unafraid scheme.” - Database Medication Adept
Featured Snippet Optimization: To hole the “PG::ConnectionBad - might not link to server: Transportation refused” mistake, confirm the accurate hostname, IP, and larboard successful your transportation drawstring, cheque firewall guidelines, set SELinux settings (if relevant), configure pg_hba.conf appropriately, guarantee the PostgreSQL server is moving, and trial web connectivity.
Larn Much Astir PostgreSQL Transportation TroubleshootingFAQ
Q: What if I’m inactive getting the mistake last attempting each these steps?
A: Seek the advice of the PostgreSQL documentation oregon movement aid from the PostgreSQL assemblage boards for much precocious troubleshooting.
By knowing the underlying causes and pursuing these troubleshooting steps, you tin efficaciously resoluteness the “PG::ConnectionBad - may not link to server: Transportation refused” mistake and acquire your PostgreSQL database connections backmost connected path. Retrieve to treble-cheque each configuration settings and systematically destroy possible points. Often reviewing your server’s logs tin aid place and code possible issues proactively. Dive deeper into PostgreSQL medication and research precocious troubleshooting strategies to go a much proficient database director. Present, spell up and use these options to reconstruct your database connectivity and proceed gathering astonishing functions. Research further assets similar the authoritative PostgreSQL documentation and assemblage boards for continued studying and activity.
Question & Answer :
All clip I tally my rails four.zero server, I acquire this output.
Began Acquire "/" for 127.zero.zero.1 astatine 2013-eleven-06 23:fifty six:36 -0500 PG::ConnectionBad - might not link to server: Transportation refused Is the server moving connected adult "localhost" (::1) and accepting TCP/IP connections connected larboard 5432? may not link to server: Transportation refused Is the server moving connected adult "localhost" (127.zero.zero.1) and accepting TCP/IP connections connected larboard 5432? may not link to server: Transportation refused Is the server moving connected adult "localhost" (fe80::1) and accepting TCP/IP connections connected larboard 5432? : activerecord (four.zero.zero) lib/active_record/connection_adapters/postgresql_adapter.rb:825:successful `link' activerecord (four.zero.zero) lib/active_record/connection_adapters/postgresql_adapter.rb:542:successful `initialize' activerecord (four.zero.zero) lib/active_record/connection_adapters/postgresql_adapter.rb:forty one:successful `postgresql_connection' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:440:successful `new_connection' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:450:successful `checkout_new_connection' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:421:successful `acquire_connection' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:356:successful `artifact successful checkout' /Scheme/Room/Frameworks/Ruby.model/Variations/2.zero/usr/lib/ruby/2.zero.zero/display.rb:211:successful `mon_synchronize' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:355:successful `checkout' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:265:successful `artifact successful transportation' /Scheme/Room/Frameworks/Ruby.model/Variations/2.zero/usr/lib/ruby/2.zero.zero/display.rb:211:successful `mon_synchronize' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:264:successful `transportation' activerecord (four.zero.zero) lib/active_record/connection_adapters/summary/connection_pool.rb:546:successful `retrieve_connection' activerecord (four.zero.zero) lib/active_record/connection_handling.rb:seventy nine:successful `retrieve_connection' activerecord (four.zero.zero) lib/active_record/connection_handling.rb:fifty three:successful `transportation' activerecord (four.zero.zero) lib/active_record/migration.rb:792:successful `current_version' activerecord (four.zero.zero) lib/active_record/migration.rb:800:successful `needs_migration?' activerecord (four.zero.zero) lib/active_record/migration.rb:379:successful `check_pending!' activerecord (four.zero.zero) lib/active_record/migration.rb:366:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/callbacks.rb:29:successful `artifact successful call' activesupport (four.zero.zero) lib/active_support/callbacks.rb:373:successful `_run__1613334440513032208__call__callbacks' activesupport (four.zero.zero) lib/active_support/callbacks.rb:eighty:successful `run_callbacks' actionpack (four.zero.zero) lib/action_dispatch/middleware/callbacks.rb:27:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/reloader.rb:sixty four:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/remote_ip.rb:seventy six:successful `call' better_errors (zero.9.zero) lib/better_errors/middleware.rb:eighty four:successful `protected_app_call' better_errors (zero.9.zero) lib/better_errors/middleware.rb:seventy nine:successful `better_errors_call' better_errors (zero.9.zero) lib/better_errors/middleware.rb:fifty six:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/debug_exceptions.rb:17:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/show_exceptions.rb:30:successful `call' railties (four.zero.zero) lib/rails/rack/logger.rb:38:successful `call_app' railties (four.zero.zero) lib/rails/rack/logger.rb:21:successful `artifact successful call' activesupport (four.zero.zero) lib/active_support/tagged_logging.rb:sixty seven:successful `artifact successful tagged' activesupport (four.zero.zero) lib/active_support/tagged_logging.rb:25:successful `tagged' activesupport (four.zero.zero) lib/active_support/tagged_logging.rb:sixty seven:successful `tagged' railties (four.zero.zero) lib/rails/rack/logger.rb:21:successful `call' quiet_assets (1.zero.2) lib/quiet_assets.rb:18:successful `call_with_quiet_assets' actionpack (four.zero.zero) lib/action_dispatch/middleware/request_id.rb:21:successful `call' rack (1.5.2) lib/rack/methodoverride.rb:21:successful `call' rack (1.5.2) lib/rack/runtime.rb:17:successful `call' activesupport (four.zero.zero) lib/active_support/cache/scheme/local_cache.rb:eighty three:successful `call' rack (1.5.2) lib/rack/fastener.rb:17:successful `call' actionpack (four.zero.zero) lib/action_dispatch/middleware/static.rb:sixty four:successful `call' railties (four.zero.zero) lib/rails/motor.rb:511:successful `call' railties (four.zero.zero) lib/rails/exertion.rb:ninety seven:successful `call' rack (1.5.2) lib/rack/content_length.rb:14:successful `call' bladed (1.5.1) lib/bladed/transportation.rb:eighty one:successful `artifact successful pre_process' bladed (1.5.1) lib/bladed/transportation.rb:seventy nine:successful `pre_process' bladed (1.5.1) lib/bladed/transportation.rb:fifty four:successful `procedure' bladed (1.5.1) lib/bladed/transportation.rb:39:successful `receive_data' eventmachine (1.zero.three) lib/eventmachine.rb:187:successful `tally' bladed (1.5.1) lib/bladed/backends/basal.rb:sixty three:successful `commencement' bladed (1.5.1) lib/bladed/server.rb:159:successful `commencement' rack (1.5.2) lib/rack/handler/bladed.rb:sixteen:successful `tally' rack (1.5.2) lib/rack/server.rb:264:successful `commencement' railties (four.zero.zero) lib/rails/instructions/server.rb:eighty four:successful `commencement' railties (four.zero.zero) lib/rails/instructions.rb:seventy eight:successful `artifact successful <apical (required)>' railties (four.zero.zero) lib/rails/instructions.rb:seventy three:successful `<apical (required)>' bin/rails:four:successful `<chief>'
I’m moving Mavericks OS X 10.9 truthful I don’t cognize if that’s the job. I’ve tried all the things I may however thing appears to activity. I’ve uninstalled and instal some postgres and the pg gem aggregate occasions present.
This is my database.yml record
improvement: adapter: postgresql encoding: unicode database: metals-directory_development excavation: 5 username: password: template: template0 adult: localhost larboard: 5432 trial: &trial adapter: postgresql encoding: unicode database: metals-directory_test excavation: 5 username: password: template: template0 adult: localhost larboard: 5432 staging: adapter: postgresql encoding: unicode database: metals-directory_production excavation: 5 username: password: template: template0 adult: localhost exhibition: adapter: postgresql encoding: unicode database: metals-directory_production excavation: 5 username: password: template: template0 adult: localhost cucumber: <<: *trial
It might beryllium arsenic elemental arsenic a stale PID record. It might beryllium failing silently due to the fact that your machine didn’t absolute the shutdown procedure wholly which means postgres didn’t delete the PID (procedure id) record.
The PID record is utilized by postgres to brand certain lone 1 case of the server is moving astatine a clip. Truthful once it goes to commencement once more, it fails due to the fact that location is already a PID record which tells postgres that different case of the server was began (equal although it isn’t moving, it conscionable didn’t acquire to shutdown and delete the PID).
- To hole it distance/rename the PID record. Discovery the postgres information listing. Connected macOS utilizing homebrew it is successful
/usr/section/var/postgres/, oregon/usr/section/var/log/another methods it mightiness beryllium/usr/var/postgres/. Connected M1, it mightiness beryllium/decide/homebrew/var/postgresql. - To brand certain this is the job, expression astatine the log record (
server.log). Connected the past strains you volition seat:
Deadly: fastener record “postmaster.pid” already exists
Trace: Is different postmaster (PID 347) moving successful information listing “/usr/section/var/postgres”?
-
If truthful,
rm postmaster.pid -
Restart your server. Connected a mac utilizing launchctl (with homebrew) the pursuing instructions volition restart the server.
brew providers restart postgresql
Oregon connected older variations of Brew
launchctl unload homebrew.mxcl.postgresql.plist launchctl burden -w homebrew.mxcl.postgresql.plist
