Psssss… This is more as a note to myself..!!!

While setting my local environment for development on Sitecore 9.3 using docker, I came across below issue.

[Win32Exception (0x80004005): The network path was not found]

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +1341
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +159
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +382
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +307
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +198
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +422
   System.Data.SqlClient.SqlConnection.Open() +199
   Sitecore.Data.DataProviders.Sql.DataProviderCommand..ctor(IDbCommand command, DataProviderTransaction transaction, Boolean openConnection) +113
   Sitecore.Data.DataProviders.Sql.<>c__DisplayClass26_0.<CreateCommand>b__0() +48
   Sitecore.Data.DataProviders.NullRetryer.Execute(Func`1 action, Action recover) +293
   Sitecore.Data.DataProviders.Sql.<>c__DisplayClass29_0.<CreateReader>b__0() +30
   Sitecore.Data.DataProviders.NullRetryer.Execute(Func`1 action, Action recover) +293
   Sitecore.Data.DataProviders.Sql.SqlDataApi.CreateReader(String sql, Object[] parameters) +281
   Sitecore.Data.DataProviders.Sql.SqlDataProvider.GetContentLanguages() +169
   Sitecore.Data.DataProviders.Sql.SqlDataProvider.LoadLanguages() +133
   Sitecore.Data.DataProviders.Sql.SqlDataProvider.GetLanguages() +49
   Sitecore.Data.SqlServer.SqlServerDataProvider.ExecutePreLoadItemDefinitionSql(String sql, Object[] parameters, SafeDictionary`2 prefetchData) +52
   Sitecore.Data.DataProviders.Retryer.ExecuteNoResult(Action action, Action recover) +539
   Sitecore.Data.SqlServer.SqlServerDataProvider.LoadInitialItemDefinitions(String condition, Object[] parameters, SafeDictionary`2 prefetchData) +237
   Sitecore.Data.DataProviders.Sql.SqlDataProvider.EnsureInitialPrefetch() +333
   Sitecore.Data.DataProviders.Sql.SqlDataProvider.GetPrefetchData(ID itemId) +62
   Unicorn.Data.DataProvider.UnicornSqlServerDataProvider.GetItemDefinition(ID itemId, CallContext context) +242
   Sitecore.Data.DataProviders.DataProvider.GetItemDefinition(ID itemID, CallContext context, DataProviderCollection providers) +156
   Sitecore.Data.DataSource.GetItemInformation(ID itemID) +88
   Sitecore.Data.DataSource.GetItemData(ID itemID, Language language, Version version) +32
   Sitecore.Data.Engines.TemplateEngine.GetdefaultSectionOrder() +118
   Sitecore.Data.Engines.TemplateEngine.InternalGetTemplates() +486
   Sitecore.Data.Engines.TemplateEngine.GetTemplate(ID templateId) +184
   Sitecore.XA.Foundation.SitecoreExtensions.Extensions.DatabaseExtensions.GetContentItemsOfTemplate(Database database, ID templateId) +126
   Sitecore.XA.Foundation.Multisite.SiteResolvers.EnvironmentSitesResolver.ResolveAllSites(Database database) +63
   Sitecore.XA.Foundation.Multisite.Providers.SxaSiteProvider.GetSiteList() +162
   Sitecore.XA.Foundation.Multisite.Providers.SxaSiteProvider.InitializeSites() +105
   Sitecore.XA.Foundation.Multisite.Providers.SxaSiteProvider.GetSites() +18
   System.Linq.<SelectManyIterator>d__17`2.MoveNext() +265
   Sitecore.Sites.SiteCollection.AddRange(IEnumerable`1 sites) +221
   Sitecore.Sites.SitecoreSiteProvider.GetSites() +258
   Sitecore.Sites.DefaultSiteContextFactory.GetSites() +253
   Sitecore.XA.Foundation.Multisite.SiteInfoResolver.get_Sites() +60
   Sitecore.XA.Foundation.Multisite.Pipelines.Initialize.InitSiteManager.Process(PipelineArgs args) +85
   (Object , Object ) +9
   Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +490
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) +236
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
   Sitecore.Nexus.Web.HttpModule.Application_Start() +220
   Sitecore.Nexus.Web.HttpModule.Init(HttpApplication app) +1165
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +584
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +168
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +277
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +369

[HttpException (0x80004005): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +532
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +111
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +724

The error speaks itself, that the CM and/or CD was not able to connect to underlying SQL server. SO, I immediately opens the SSMS and try to connect to my SQL server running as container on my local and I am successfully able to connect both using IP address as well as using alias(in my case it’s sql).

So what’s the issue??? When I am able to connect to SQL server running in container using outside of the Docker created network than why my CM and/or CD instance is not able to connect to it within the same network???

I check inward and outward binding ports setting in docker-compose.yml file for SQL service. Double check connection strings for server name, user name and password and that all looks correct.

Thanks to one of my colleague, who points out my docker-compose file was missing hostname for SQL server service.

I have added them to my docker-compose.yml for SQL, SOLR and XCONNECT and happy days.

The sample docker-compose.yml is as below.

version: '2.4'

networks:
  dev.local:

services:

  sql:
    hostname: sql
    image: ${REGISTRY}sitecore-xp-sxa-coveo-def-sqldev:${SITECORE_VERSION}-windowsservercore-${WINDOWSSERVERCORE_VERSION}
    networks:
      dev.local:   
    volumes:
      - .\data\sql:C:\Data
    mem_limit: 2GB
   
    ports:
      - "44010:1433"
    environment:
      SA_PASSWORD: ${SQL_SA_PASSWORD}
      ACCEPT_EULA: "Y"

  solr:
    hostname: solr
    image: ${REGISTRY}sitecore-xp-sxa-solr:${SITECORE_VERSION}-nanoserver-${NANOSERVER_VERSION}
    networks:
      dev.local:
    volumes:
      - .\data\solr:C:\Data
    mem_limit: 1GB
    networks:
      dev.local:
    ports:
      - "44011:8983"

  xconnect:
    hostname: xconnect
    image: ${REGISTRY}sitecore-xp-xconnect:${SITECORE_VERSION}-windowsservercore-${WINDOWSSERVERCORE_VERSION}
    volumes:
      - .\data\xconnect\logs:C:\inetpub\wwwroot\App_Data\logs
      - .\data\xconnect-appdata\models:C:\inetpub\wwwroot\App_Data\Models
    networks:
      dev.local:
    ports:
        - "44012:80"
    mem_limit: 1GB
    environment:
      SITECORE_LICENSE: ${SITECORE_LICENSE}
      SITECORE_SITECORE:XCONNECT:COLLECTIONSEARCH:SERVICES:SOLR.SOLRREADERSETTINGS:OPTIONS:REQUIREHTTPS: 'false'
      SITECORE_SITECORE:XCONNECT:SEARCHINDEXER:SERVICES:SOLR.SOLRWRITERSETTINGS:OPTIONS:REQUIREHTTPS: 'false'
      SITECORE_CONNECTIONSTRINGS_MESSAGING: Data Source=sql;Database=Sitecore.Messaging;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_PROCESSING.ENGINE.STORAGE: Data Source=sql;Database=Sitecore.ProcessingEngineStorage;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_REPORTING: Data Source=sql;Database=Sitecore.Reporting;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_XDB.MARKETINGAUTOMATION: Data Source=sql;Database=Sitecore.MarketingAutomation;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_XDB.PROCESSING.POOLS: Data Source=sql;Database=Sitecore.Processing.Pools;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_XDB.REFERENCEDATA: Data Source=sql;Database=Sitecore.ReferenceData;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_COLLECTION: Data Source=sql;Database=Sitecore.Xdb.Collection.ShardMapManager;User ID=sa;Password=${SQL_SA_PASSWORD}
      SITECORE_CONNECTIONSTRINGS_SOLRCORE: http://solr:8983/solr/sitecore_xdb
    depends_on:
      - sql
      - solr