Develop Reference

How to resolve exception with Selenium & ChromeDriver

I'm running ChromeDriver (v89) & Selenium 4.1 on MacOS and am getting an exception when instantiating ChromeDriver by passing an instance of ChromeDriverService and these options:
{
"browserName": "chrome",
"goog:chromeOptions": {
"args": [
"no-sandbox"
],
"debuggerAddress": "127.0.0.1:8080"
}
}
Details of the exception:
OpenQA.Selenium.WebDriverException: The HTTP request to the remote WebDriver server for URL http://localhost:49385/session timed out after 60 seconds.
---> System.Threading.Tasks.TaskCanceledException: The operation was canceled.
---> System.IO.IOException: Unable to read data from the transport connection: Operation canceled.
---> System.Net.Sockets.SocketException (89): Operation canceled
--- End of inner exception stack trace ---
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token)
at System.Net.Http.HttpConnection.FillAsync()
at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed)
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts) at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo) at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute) --- End of inner exception stack trace --- at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute) at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute) at OpenQA.Selenium.WebDriver.Execute(String driverCommandToExecute, Dictionary2 parameters)
at OpenQA.Selenium.WebDriver.StartSession(ICapabilities desiredCapabilities)
at OpenQA.Selenium.WebDriver..ctor(ICommandExecutor executor, ICapabilities capabilities)
at OpenQA.Selenium.Chromium.ChromiumDriver..ctor(ChromiumDriverService service, ChromiumOptions options, TimeSpan commandTimeout)
at OpenQA.Selenium.Chrome.ChromeDriver..ctor(ChromeDriverService service, ChromeOptions options, TimeSpan commandTimeout)
at OpenQA.Selenium.Chrome.ChromeDriver..ctor(ChromeDriverService service, ChromeOptions options)
The same code worked fine on Windows, so I dare to say that it's been tested.
Libraries I'm using:
OpenQA,/Users/mbaas/.nuget/packages/Selenium.WebDriver/4.1.0/lib/netstandard2.1/WebDriver.dll
OpenQA.Selenium,/Users/mbaas/.nuget/packages/Selenium.WebDriver/4.1.0/lib/netstandard2.1/WebDriver.dll
OpenQA.Selenium.Chrome,/Users/mbaas/.nuget/packages/Selenium.WebDriver/4.1.0/lib/netstandard2.1/WebDriver.dll
Newtonsoft.Json,/Users/mbaas/.nuget/packages/Newtonsoft.Json/12.0.3/lib/netstandard2.0/Newtonsoft.Json.dll
OpenQA.Selenium.Support,/Users/mbaas/.nuget/packages/Selenium.Support/4.1.0/lib/netstandard2.1/WebDriver.Support.dll
OpenQA.Selenium.Support.UI,/Users/mbaas/.nuget/packages/Selenium.Support/4.1.0/lib/netstandard2.1/WebDriver.Support.dll

I think I found the answer: the plan was to launch a separate process beforehand that runs CEF and the site - but that step failed, so there is no browser it could talk to.
My bad - I should have checked that before posting here.

IDX20803: Unable to obtain configuration from: 'https://localhost/IdentityServer/Core/.well-known/openid-configuration'

We are using the IdentityServer3.Membership library for IdentityServer. Token validation is works fine using HTTP both in Local as well as QA machine. But when we configure to HTTPS then getting below error.
Steps.
Validating the token in Asp.net core 3.0 application using identityserver4.AccessTokenValidation library3.0.1
Error is getting when we hosted in IIS. and using both self signed and CA certificate
Certificate is added in Trusted certificate.
Error Details:
04/16/2020 17:19:50.651 -04:00 [Error] IDX20803: Unable to obtain configuration from: 'https://localhost/IdentityServer/Core/.well-known/openid-configuration'.
System.InvalidOperationException: IDX20803: Unable to obtain configuration from: 'https://localhost/IdentityServer/Core/.well-known/openid-configuration'.
---> System.IO.IOException: IDX20804: Unable to retrieve document from: 'https://localhost/IdentityServer/Core/.well-known/openid-configuration'.
---> System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.
---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception.
---> System.ComponentModel.Win32Exception (0x80090331): The client and server cannot communicate, because they do not possess a common algorithm.
--- End of inner exception stack trace ---
at System.Net.Security.SslStream.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, ExceptionDispatchInfo exception)
at System.Net.Security.SslStream.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslStream.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslStream.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslStream.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslStream.PartialFrameCallback(AsyncProtocolRequest asyncRequest)
--- End of stack trace from previous location where exception was thrown ---
at System.Net.Security.SslStream.ThrowIfExceptional()
at System.Net.Security.SslStream.InternalEndProcessAuthentication(LazyAsyncResult lazyResult)
at System.Net.Security.SslStream.EndProcessAuthentication(IAsyncResult result)
at System.Net.Security.SslStream.EndAuthenticateAsClient(IAsyncResult asyncResult)
at System.Net.Security.SslStream.<>c.b__65_1(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action1 endAction, Task1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts) at Microsoft.IdentityModel.Protocols.HttpDocumentRetriever.GetDocumentAsync(String address, CancellationToken cancel) --- End of inner exception stack trace --- at Microsoft.IdentityModel.Protocols.HttpDocumentRetriever.GetDocumentAsync(String address, CancellationToken cancel) at Microsoft.IdentityModel.Protocols.OpenIdConnect.OpenIdConnectConfigurationRetriever.GetAsync(String address, IDocumentRetriever retriever, CancellationToken cancel) at Microsoft.IdentityModel.Protocols.ConfigurationManager1.GetConfigurationAsync(CancellationToken cancel)
--- End of inner exception stack trace ---
at Microsoft.IdentityModel.Protocols.ConfigurationManager1.GetConfigurationAsync(CancellationToken cancel) at Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerHandler.HandleAuthenticateAsync() at Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerHandler.HandleAuthenticateAsync() at Microsoft.AspNetCore.Authentication.AuthenticationHandler1.AuthenticateAsync()
at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme)
at IdentityServer4.AccessTokenValidation.IdentityServerAuthenticationHandler.HandleAuthenticateAsync()
04/16/2020 17:19:50.988 -04:00 [Information] "Bearer" was not authenticated. Failure message: "IDX20803: Unable to obtain configuration from: 'https://localhost/IdentityServer/Core/.well-known/openid-configuration'."
04/16/2020 17:19:51.031 -04:00 [Information] AuthenticationScheme: "Bearer" was challenged.
Your help is highly appreciated on this.!

Resolved the issue adding below code in Startup-->Configure
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12
| SecurityProtocolType.Ssl3;

Yes My issue is also resolved by adding below lines of code.
I appreciate you help and this blog.
IdentityModelEventSource.ShowPII = true;
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12| SecurityProtocolType.Ssl3;

Net core 2.2: OperationCanceledException instead of TaskCanceledException on HttpClient timeout

In our project we have an HttpClient for outgoing connection with a strict timeout, and previously, I dealt with the timeout situation like all the tutorials suggested: by catching the TaskCanceledException. And it worked. But since recently (can't say the exact time, but about a month), the timeout started to cause the OperationCanceledException.
System.OperationCanceledException: The operation was canceled.
at System.Net.Http.HttpClient.HandleFinishSendAsyncError(Exception e, CancellationTokenSource cts)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
<buisness-logic traceback>
at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at System.Threading.Tasks.ValueTask`1.get_Result()
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
at NSwag.AspNetCore.Middlewares.SwaggerUiIndexMiddleware`1.Invoke(HttpContext context)
at NSwag.AspNetCore.Middlewares.RedirectToIndexMiddleware.Invoke(HttpContext context)
at NSwag.AspNetCore.Middlewares.SwaggerDocumentMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()
It's not a big problem to change all the catches to OperationCanceledException, but I'd like to know why? Does anybody know why HttpClient could switch the exception? I deploy the application locally using the VS2019 16.4.3 and IIS express. Net core 2.2

I found it.
https://github.com/dotnet/corefx/issues/33957
Basically, in case of short timeouts there is a race condition that can cause OCE to happen. What it means is "we do not really know what exactly happen, and we do not care, so you shouldn't too".

Intermittent connection failures when using Google Translation API using the C# API

I am getting intermittent errors when using the Google translation C# APIs. Weirdly enough I never ever get the error on my local PC, it's only when I run it on our Test and Prod servers do I get the error.
The code is straightforward.
var credential = GoogleCredential.FromJson(#"
{
// .....text from my google credentials json file
}");
var client = TranslationClient.Create(credential);
var response = client?.TranslateText("Hello World.", "fr");
The error I get is
System.Net.Http.HttpRequestException: No connection could be made because the target machine actively refused it ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it
at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at Google.Apis.Http.ConfigurableMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
at Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.ExecuteAsync(TokenRequest request, HttpClient httpClient, String tokenServerUrl, CancellationToken taskCancellationToken, IClock clock)
at Google.Apis.Auth.OAuth2.ServiceAccountCredential.RequestAccessTokenAsync(CancellationToken taskCancellationToken)
at Google.Apis.Auth.OAuth2.TokenRefreshManager.RefreshTokenAsync()
at Google.Apis.Auth.OAuth2.TokenRefreshManager.ResultWithUnwrappedExceptions[T](Task`1 task)
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
at Google.Apis.Auth.OAuth2.TokenRefreshManager.GetAccessTokenForRequestAsync(CancellationToken cancellationToken)
at Google.Apis.Auth.OAuth2.ServiceAccountCredential.GetAccessTokenForRequestAsync(String authUri, CancellationToken cancellationToken)
at Google.Apis.Auth.OAuth2.ServiceCredential.InterceptAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at Google.Apis.Http.ConfigurableMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
at Google.Apis.Requests.ClientServiceRequest`1.ExecuteUnparsedAsync(CancellationToken cancellationToken)
at Google.Apis.Requests.ClientServiceRequest`1.Execute()
at Google.Cloud.Translation.V2.TranslationClientImpl.TranslateText(IEnumerable`1 textItems, String targetLanguage, String sourceLanguage, Nullable`1 model)
at Google.Cloud.Translation.V2.TranslationClient.TranslateText(String text, String targetLanguage, String sourceLanguage, Nullable`1 model)
at QuickStart.Main(String[] args)
I suspect the error is in the authentication code. Curiously it seems to work on the servers in spurts, so connects and translates fine for a period of time, and then stops to do so, throwing the aforementioned error.
Do I need a separate key for every server?
As I said before works flawlessly on my PC - Every. Single. Time.
I am on the currently on a basic account, so not sure if there are any thresholds that I am breaching, but could not find anything in the documentation.

Deploying asp.net core self-contained web app to Ubuntu. Database name empty when present in appsettings.json

I just set up a LAMP server VM on Digital Ocean. OS is Ubuntu 18.04 x64. MySQL is 5.7.23. I also have a published to a local folder asp.net core web application, which I have set to Ubuntu 18.04-x64. I copied the files from the local folder to var/MyApp on the server and set chmod +x on the executable file. I also changed the MySql root password and created a database named limboworld. My application is set to run all migrations on startup. However when I start it with ./catchme.bg I get the following output with an error shown below.
I tried changing the MySql password and also the connection string from:
"catchmebgContextConnection": "Server=localhost;Database=limboworld;User=root;Password=limboworld;"
to
"catchmebgContextConnection": "Server=localhost;Database=limboworld;Uid=root;Pwd=limboworld;"
info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0]
User profile is available. Using '/root/.aspnet/DataProtection-Keys' as key repository; keys will not be encrypted at rest.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 2.1.11-servicing-32099 initialized 'catchmebgContext' using provider 'Pomelo.EntityFrameworkCore.MySql' with options: MaxPoolSize=128 ServerVersion 5.7.24 MySql
fail: Microsoft.EntityFrameworkCore.Database.Connection[20004]
An error occurred using the connection to database '' on server 'localhost'.
MySql.Data.MySqlClient.MySqlException (0x80004005): Access denied for user 'root'#'localhost'
...
Application startup exception: MySql.Data.MySqlClient.MySqlException (0x80004005): Access denied for user 'root'#'localhost'
at MySqlConnector.Core.ServerSession.ConnectAsync(ConnectionSettings cs, ILoadBalancer loadBalancer, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 356
at MySql.Data.MySqlClient.MySqlConnection.CreateSessionAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 442
at MySql.Data.MySqlClient.MySqlConnection.OpenAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 175
at MySql.Data.MySqlClient.MySqlConnection.Open() in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 161
at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected)
at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlDatabaseCreator.<>c__DisplayClass18_0.<Exists>b__0(DateTime giveUp)
at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.<>c__DisplayClass12_0`2.<Execute>b__0(DbContext c, TState s)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func`2 operation, Func`2 verifySucceeded, TState state)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlDatabaseCreator.Exists(Boolean retryOnNotExists)
at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists()
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at catchme.bg.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, catchmebgContext db1, CatchmeContext db2) in C:\Users\Ivan\Source\repos\catchme.bg\catchme.bg\catchme.bg\Startup.cs:line 84
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
crit: Microsoft.AspNetCore.Hosting.Internal.WebHost[6]
Application startup exception
MySql.Data.MySqlClient.MySqlException (0x80004005): Access denied for user 'root'#'localhost'
at MySqlConnector.Core.ServerSession.ConnectAsync(ConnectionSettings cs, ILoadBalancer loadBalancer, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 356
at MySql.Data.MySqlClient.MySqlConnection.CreateSessionAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 442
at MySql.Data.MySqlClient.MySqlConnection.OpenAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 175
at MySql.Data.MySqlClient.MySqlConnection.Open() in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 161
at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected)
at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlDatabaseCreator.<>c__DisplayClass18_0.<Exists>b__0(DateTime giveUp)
at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.<>c__DisplayClass12_0`2.<Execute>b__0(DbContext c, TState s)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func`2 operation, Func`2 verifySucceeded, TState state)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlDatabaseCreator.Exists(Boolean retryOnNotExists)
at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists()
at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
at catchme.bg.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, catchmebgContext db1, CatchmeContext db2) in C:\Users\Ivan\Source\repos\catchme.bg\catchme.bg\catchme.bg\Startup.cs:line 84
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
Hosting environment: Production
Content root path: /var/MyApp
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.
I would like to connect to the database on application startup and run the migrations. However because of the above error it doesn't work.
Any ideas would be very helpful!

It turned out MySql 5.7 uses a plugin named 'auth_socket', which enables the root user to login to mysql with no password.
This line sets a password 'test' for the root account:
ALTER USER 'root'#'localhost' IDENTIFIED WITH mysql_native_password BY 'test';
After setting the password in the appsettings.json and appsettings.production.json files, everything worked correctly!
Here is the link, that I used to fix the problem:
https://www.percona.com/blog/2016/03/16/change-user-password-in-mysql-5-7-with-plugin-auth_socket/
Thank you all for looking at my question!