Hello, We have a discourse for the Scala PL for users which was running fine for years : [image] Scala Users a forum for the Scala programming language. beginner questions welcome Last week, I upgraded to the latest version using "./launcher rebuild app ", since then we have very often the error “Oops - Error 500”. It appears when the website was already visited. In a browser private window, it works fine. So clearing the website data on the browser works for some time, but the problem appears again. I tried to update 2 times discourse for the dashboard, then also to rebuild it again using “./launcher rebuild app”, but it’s still the same. In log/rails/production.log I only see: Started GET "/" for 127.0.0.1 at 2026-09-03 09:57:56 +0000 Processing by ListController#latest as HTML Rendered layout layouts/application.html.erb (Duration: 391.6ms | GC: 229.5ms) Completed 500 Internal Server Error in 474ms (Views: 392.5ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 236.0ms) Any idea what’s wrong and what I could do to solve the problem? Thanks a lot! Fabien

Looking deeper, deleting the _t cookie remove the “error 500”, but the error appears again when logged after maybe around 1h.

v2026.9.0 has not been release yet - are you referring to the development/latest version? [image] Discourse Releases Browse Discourse release history & changelogs.

I’ve not set any specific version, so I guess by default it should be latest (according to "tests-passed" is now "latest" ). In the dashboard, this is the version I get at the bottom.

I only have that in the logs (production.log), nothing elsewhere: Started GET "/" for 127.0.0.1 at 2026-09-07 08:05:50 +0000 Processing by ListController#latest as HTML Rendered layout layouts/application.html.erb (Duration: 164.0ms | GC: 13.5ms) Completed 500 Internal Server Error in 248ms (Views: 164.7ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 15.9ms) I couldn’t find a way to add more debug. BTW, I also tried to use /safe-mode but it doesn’t change anything…

It’s on the route /logs unless that is failing too.

Sorry, I was looking at the container logs. Here they are: Message (18 copies reported) PG::InvalidTextRepresentation (ERROR: invalid input syntax for type inet: "unix:" LINE 7: client_ip = 'unix:', ^ ) lib/mini_sql_multisite_connection.rb:109:in 'MiniSqlMultisiteConnection#run' app/models/user_auth_token.rb:244:in 'UserAuthToken#rotate!' lib/auth/default_current_user_provider.rb:260:in 'Auth::DefaultCurrentUserProvider#refresh_session' lib/current_user.rb:52:in 'CurrentUser#refresh_session' app/controllers/application_controller.rb:91:in 'ApplicationController#perform_refresh_session' app/controllers/application_controller.rb:444:in 'block in ApplicationController#with_resolved_locale' app/controllers/application_controller.rb:444:in 'ApplicationController#with_resolved_locale' app/controllers/application_controller.rb:1126:in 'ApplicationController#ensure_dont_cache_page' lib/middleware/omniauth_bypass_middleware.rb:35:in 'Middleware::OmniauthBypassMiddleware#call' lib/middleware/crawler_hooks.rb:13:in 'Middleware::CrawlerHooks#call' lib/content_security_policy/middleware.rb:12:in 'ContentSecurityPolicy::Middleware#call' lib/middleware/anonymous_cache.rb:431:in 'Middleware::AnonymousCache#call' lib/middleware/csp_script_nonce_injector.rb:13:in 'Middleware::CspScriptNonceInjector#call' lib/middleware/track_view_session_id_injector.rb:12:in 'Middleware::TrackViewSessionIdInjector#call' config/initializers/008-rack-cors.rb:14:in 'Discourse::Cors#call' lib/middleware/default_headers.rb:13:in 'Middleware::DefaultHeaders#call' config/initializers/100-quiet_logger.rb:20:in 'DiscourseRackQuietAssetsLogger#call' config/initializers/100-silence_logger.rb:29:in 'SilenceLogger#call' lib/middleware/enforce_hostname.rb:23:in 'Middleware::EnforceHostname#call' lib/middleware/request_tracker.rb:381:in 'Middleware::RequestTracker#call' lib/middleware/overload_protections.rb:18:in 'Middleware::OverloadProtections#call' lib/middleware/processing_request.rb:14:in 'Middleware::ProcessingRequest#call' Backtrace rack-mini-profiler (4.0.1) lib/patches/db/pg/alias_method.rb:112:in 'PG::Connection#exec' rack-mini-profiler (4.0.1) lib/patches/db/pg/alias_method.rb:112:in 'PG::Connection#async_exec' mini_sql (1.6.0) lib/mini_sql/postgres/connection.rb:217:in 'MiniSql::Postgres::Connection#run' mini_sql (1.6.0) lib/mini_sql/active_record_postgres/connection.rb:38:in 'block in MiniSql::ActiveRecordPostgres::Connection#run' mini_sql (1.6.0) lib/mini_sql/active_record_postgres/connection.rb:34:in 'block in MiniSql::ActiveRecordPostgres::Connection#with_lock' activesupport (8.0.5.1) lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize' mini_sql (1.6.0) lib/mini_sql/active_record_postgres/connection.rb:34:in 'MiniSql::ActiveRecordPostgres::Connection#with_lock' mini_sql (1.6.0) lib/mini_sql/active_record_postgres/connection.rb:38:in 'MiniSql::ActiveRecordPostgres::Connection#run' lib/mini_sql_multisite_connection.rb:109:in 'MiniSqlMultisiteConnection#run' mini_sql (1.6.0) lib/mini_sql/postgres/connection.rb:196:in 'MiniSql::Postgres::Connection#exec' app/models/user_auth_token.rb:244:in 'UserAuthToken#rotate!' lib/auth/default_current_user_provider.rb:260:in 'Auth::DefaultCurrentUserProvider#refresh_session' lib/current_user.rb:52:in 'CurrentUser#refresh_session' app/controllers/application_controller.rb:91:in 'ApplicationController#perform_refresh_session' activesupport (8.0.5.1) lib/active_support/callbacks.rb:361:in 'block in ActiveSupport::Callbacks::CallTemplate::MethodCall#make_lambda' activesupport (8.0.5.1) lib/active_support/callbacks.rb:207:in 'ActiveSupport::Callbacks::Filters::After#call' activesupport (8.0.5.1) lib/active_support/callbacks.rb:563:in 'block in ActiveSupport::Callbacks::CallbackSequence#invoke_after' activesupport (8.0.5.1) lib/active_support/callbacks.rb:563:in 'Array#each' activesupport (8.0.5.1) lib/active_support/callbacks.rb:563:in 'ActiveSupport::Callbacks::CallbackSequence#invoke_after' activesupport (8.0.5.1) lib/active_support/callbacks.rb:134:in 'block in ActiveSupport::Callbacks#run_callbacks' app/controllers/application_controller.rb:444:in 'block in ApplicationController#with_resolved_locale' i18n (1.15.2) lib/i18n.rb:383:in 'I18n::Base#with_locale' app/controllers/application_controller.rb:444:in 'ApplicationController#with_resolved_locale' activesupport (8.0.5.1) lib/active_support/callbacks.rb:129:in 'block in ActiveSupport::Callbacks#run_callbacks' app/controllers/application_controller.rb:1126:in 'ApplicationController#ensure_dont_cache_page' activesupport (8.0.5.1) lib/active_support/callbacks.rb:129:in 'block in ActiveSupport::Callbacks#run_callbacks' activesupport (8.0.5.1) lib/active_support/callbacks.rb:140:in 'ActiveSupport::Callbacks#run_callbacks' actionpack (8.0.5.1) lib/abstract_controller/callbacks.rb:260:in 'AbstractController::Callbacks#process_action' actionpack (8.0.5.1) lib/action_controller/metal/rescue.rb:27:in 'ActionController::Rescue#process_action' actionpack (8.0.5.1) lib/action_controller/metal/instrumentation.rb:76:in 'block in ActionController::Instrumentation#process_action' activesupport (8.0.5.1) lib/active_support/notifications.rb:210:in 'block in ActiveSupport::Notifications.instrument' activesupport (8.0.5.1) lib/active_support/notifications/instrumenter.rb:58:in 'ActiveSupport::Notifications::Instrumenter#instrument' activesupport (8.0.5.1) lib/active_support/notifications.rb:210:in 'ActiveSupport::Notifications.instrument' actionpack (8.0.5.1) lib/action_controller/metal/instrumentation.rb:75:in 'ActionController::Instrumentation#process_action' actionpack (8.0.5.1) lib/action_controller/metal/params_wrapper.rb:259:in 'ActionController::ParamsWrapper#process_action' activerecord (8.0.5.1) lib/active_record/railties/controller_runtime.rb:39:in 'ActiveRecord::Railties::ControllerRuntime#process_action' actionpack (8.0.5.1) lib/abstract_controller/base.rb:152:in 'AbstractController::Base#process' actionview (8.0.5.1) lib/action_view/rendering.rb:40:in 'ActionView::Rendering#process' rack-mini-profiler (4.0.1) lib/mini_profiler/profiling_methods.rb:116:in 'block in ActionController::Base#profile_method' actionpack (8.0.5.1) lib/action_controller/metal.rb:252:in 'ActionController::Metal#dispatch' actionpack (8.0.5.1) lib/action_controller/metal.rb:335:in 'ActionController::Metal.dispatch' actionpack (8.0.5.1) lib/action_dispatch/routing/route_set.rb:67:in 'ActionDispatch::Routing::RouteSet::Dispatcher#dispatch' actionpack (8.0.5.1) lib/action_dispatch/routing/route_set.rb:50:in 'ActionDispatch::Routing::RouteSet::Dispatcher#serve' actionpack (8.0.5.1) lib/action_dispatch/routing/mapper.rb:32:in 'block in class:Constraints' actionpack (8.0.5.1) lib/action_dispatch/routing/mapper.rb:62:in 'ActionDispatch::Routing::Mapper::Constraints#serve' actionpack (8.0.5.1) lib/action_dispatch/journey/router.rb:53:in 'block in ActionDispatch::Journey::Router#serve' actionpack (8.0.5.1) lib/action_dispatch/journey/router.rb:133:in 'block in ActionDispatch::Journey::Router#find_routes' actionpack (8.0.5.1) lib/action_dispatch/journey/router.rb:126:in 'Array#each' actionpack (8.0.5.1) lib/action_dispatch/journey/router.rb:126:in 'ActionDispatch::Journey::Router#find_routes' actionpack (8.0.5.1) lib/action_dispatch/journey/router.rb:34:in 'ActionDispatch::Journey::Router#serve' actionpack (8.0.5.1) lib/action_dispatch/routing/route_set.rb:908:in 'ActionDispatch::Routing::RouteSet#call' lib/middleware/omniauth_bypass_middleware.rb:35:in 'Middleware::OmniauthBypassMiddleware#call' lib/middleware/crawler_hooks.rb:13:in 'Middleware::CrawlerHooks#call' rack (2.2.24) lib/rack/tempfile_reaper.rb:15:in 'Rack::TempfileReaper#call' rack (2.2.24) lib/rack/conditional_get.rb:27:in 'Rack::ConditionalGet#call' rack (2.2.24) lib/rack/head.rb:12:in 'Rack::Head#call' actionpack (8.0.5.1) lib/action_dispatch/http/permissions_policy.rb:38:in 'ActionDispatch::PermissionsPolicy::Middleware#call' lib/content_security_policy/middleware.rb:12:in 'ContentSecurityPolicy::Middleware#call' lib/middleware/anonymous_cache.rb:431:in 'Middleware::AnonymousCache#call' lib/middleware/csp_script_nonce_injector.rb:13:in 'Middleware::CspScriptNonceInjector#call' lib/middleware/track_view_session_id_injector.rb:12:in 'Middleware::TrackViewSessionIdInjector#call' config/initializers/008-rack-cors.rb:14:in 'Discourse::Cors#call' rack (2.2.24) lib/rack/session/abstract/id.rb:266:in 'Rack::Session::Abstract::Persisted#context' rack (2.2.24) lib/rack/session/abstract/id.rb:260:in 'Rack::Session::Abstract::Persisted#call' actionpack (8.0.5.1) lib/action_dispatch/middleware/cookies.rb:706:in 'ActionDispatch::Cookies#call' actionpack (8.0.5.1) lib/action_dispatch/middleware/callbacks.rb:31:in 'block in ActionDispatch::Callbacks#call' activesupport (8.0.5.1) lib/active_support/callbacks.rb:100:in 'ActiveSupport::Callbacks#run_callbacks' actionpack (8.0.5.1) lib/action_dispatch/middleware/callbacks.rb:30:in 'ActionDispatch::Callbacks#call' actionpack (8.0.5.1) lib/action_dispatch/middleware/debug_exceptions.rb:31:in 'ActionDispatch::DebugExceptions#call' actionpack (8.0.5.1) lib/action_dispatch/middleware/show_exceptions.rb:32:in 'ActionDispatch::ShowExceptions#call' logster (2.21.0) lib/logster/middleware/reporter.rb:40:in 'Logster::Middleware::Reporter#call' lib/middleware/default_headers.rb:13:in 'Middleware::DefaultHeaders#call' railties (8.0.5.1) lib/rails/rack/logger.rb:41:in 'Rails::Rack::Logger#call_app' railties (8.0.5.1) lib/rails/rack/logger.rb:29:in 'Rails::Rack::Logger#call' config/initializers/100-quiet_logger.rb:20:in 'DiscourseRackQuietAssetsLogger#call' config/initializers/100-silence_logger.rb:29:in 'SilenceLogger#call' actionpack (8.0.5.1) lib and Message (209 copies reported) Job exception: ERROR: invalid input syntax for type inet: "unix:" LINE 2: SET ip_address = 'unix:' ^ Backtrace /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#exec' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#async_exec' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/postgres/connection.rb:217:in 'MiniSql::Postgres::Connection#run' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/active_record_postgres/connection.rb:38:in 'block in MiniSql::ActiveRecordPostgres::Connection#run' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/active_record_postgres/connection.rb:34:in 'block in MiniSql::ActiveRecordPostgres::Connection#with_lock' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5.1/lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/active_record_postgres/connection.rb:34:in 'MiniSql::ActiveRecordPostgres::Connection#with_lock' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/active_record_postgres/connection.rb:38:in 'MiniSql::ActiveRecordPostgres::Connection#run' /var/www/discourse/lib/mini_sql_multisite_connection.rb:109:in 'MiniSqlMultisiteConnection#run' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_sql-1.6.0/lib/mini_sql/postgres/connection.rb:196:in 'MiniSql::Postgres::Connection#exec' /var/www/discourse/app/models/user.rb:1142:in 'User.update_ip_address!' /var/www/discourse/lib/auth/default_current_user_provider.rb:235:in 'block in Auth::DefaultCurrentUserProvider#current_user' /var/www/discourse/lib/scheduler/defer.rb:135:in 'block in Scheduler::Deferrable#do_work' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-9.0.0/lib/rails_multisite/connection_management/null_instance.rb:54:in 'RailsMultisite::ConnectionManagement::NullInstance#with_connection' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-9.0.0/lib/rails_multisite/connection_management.rb:23:in 'RailsMultisite::ConnectionManagement.with_connection' /var/www/discourse/lib/scheduler/defer.rb:130:in 'Scheduler::Deferrable#do_work' /var/www/discourse/lib/scheduler/defer.rb:116:in 'block (2 levels) in Scheduler::Deferrable#start_thread'

Are you operating some kind of proxy - can you describe the architecture? Looks like you are trying to pass the string “unix:” to the ip_address field … This could be a misconfiguration upstream of Discourse. There was a similar issue reported, and solved here which related to Caddy: [image] I'm using a Unix socket between Caddy and Discourse instead of TCP, but from time to time I get a 'unix:' error Support @Falco @satonotdead I managed to fix it. I waited a good while to make sure it was really fixed, and it seems it is. The setup Discourse runs in Docker and exposes nginx on a Unix socket (/var/discourse/shared/standalone/nginx.http.sock). Caddy sits in front of it as a reverse proxy and passes the client’s real IP through X-Real-IP. Two things had to change: the nginx config inside the container, and the way I run the rebuild. 1. app.yml ## Plugins go here ## see https://meta.discourse.org/t…

Thanks a lot for the help! I have exactly this configuration: [image] Installing Discourse Behind Reverse Proxy using recommended (supported) installation Self-hosting In this post, I will show you exactly how to run discourse behind a nginx reverse proxy. While still using the supported installation methods. Requirements: Valid domain name. Valid ssl certificate. Valid DNS entries pointing to the domain name. Valid working email server or smtp provider. Working Nginx Reverse Proxy and ability to reach the instance and create the SSL cert for later use. VM or LxC container that can run docker. For this guide I will be using my own instance as an example, w… … except it was missing the “proxy_set_header X-Real-IP $remote_addr;”. So, I guess it could be related. It seems to work ok now. I’ll do more tests and report it tomorrow if this solves the issue. Thanks!

Yep. I had the same problem and I just add this new directive proxy_set_header X-Real-IP $remote_addr; in /etc/nginx/sites-enabled/myforum-ssl.com file and that seems to work Thanks @Fabien_1015 @merefield

Error 500 after upgrade to v2026.9.0 / temporary solved by clearing browser data

Product Support Self-hosting

merefield (Robert) September 3, 2026, 5:18pm 5

In /logs, can you find the 500 error and share the error and its backtrace?

Topic		Replies	Views
The discourse stopped working with error 500 Internal Server Error Bug	1	3171	March 7, 2017
I'm using a Unix socket between Caddy and Discourse instead of TCP, but from time to time I get a 'unix:' error Product Support	12	398	August 29, 2026
Forum doesn't work after latest upgrade Self-hosting	17	658	May 17, 2024
Stuck with 500 error after weird bugs and a rebuild Self-hosting	17	2358	January 8, 2024
Link to upgrade shows 500 error Bug	6	1205	October 2, 2017

Error 500 after upgrade to v2026.9.0 / temporary solved by clearing browser data

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